九州大学 研究者情報
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笹木 圭子(ささき けいこ) データ更新日:2020.10.20

教授 /  工学研究院 地球資源システム工学部門 資源システム工学


主な研究テーマ
水圏において機能する陰イオン吸着剤としての金属有機構造体の合成とキャラクタリゼーション
キーワード:金属有機構造体
2017.04~2020.03.
炭素質難処理金鉱石のバイオプレトリートメントに関する研究
キーワード:難処理金鉱石
2015.10~2020.03.
カルシウム系添加剤によるセメント固化したフライアッシュからの有害陰イオン溶出の抑制機構
キーワード:フライアッシュ、セメント、有害陰イオン、溶出
2017.04~2020.03.
放射性核種埋設に向けたジオミメティクスに由来する吸着材の開発
キーワード:放射性核種、吸着材、ジオミメティクス
2016.04~2019.03.
国産カルシウム資源を用いたホウ酸、亜セレン酸およびフッ化物イオンのハイドロシキアパタイトとの共沈
キーワード:ホウ酸、亜セレン酸、フッ化物イオン、ハイドロシキアパタイト、共沈
2012.04~2019.03.
環境水の陰イオン吸着剤としての層状複水酸化物の合成とその有機修飾
キーワード:層状複水酸化物, 陰イオン吸着剤
2011.02~2019.03.
生体機能に由来したマンガン酸化物を出発物質としたリチウムイオンシーブの合成およびその集積化
キーワード:マンガン酸化微生物、リチウムイオンシーブ
2010.04~2018.03.
好熱性鉄酸化細菌を媒介としたヒ酸塩の生成
キーワード:好熱性鉄酸化細菌、ヒ酸塩
2010.05~2011.03.
硫酸イオン共存下におけるセレン酸イオンの分離
キーワード:硫酸、セレン酸、分離
2010.05~2011.03.
好熱性鉄酸化古細菌によるヒ素含有銅鉱石のバイオリーチング
キーワード:好熱性鉄酸化古細菌、ヒ素含有銅鉱石、バイオリーチング
2008.04~2013.03.
廃棄物に由来する放射性核種のバリア材に関する研究
キーワード:放射性核種、ハイドロキシアパタイト、動物骨材、イオン交換
2009.04~2012.03.
難処理陰イオンバリア材の合成および再生
キーワード:フッ素、ホウ素、金属酸化物、複合酸化物、層状複合水酸化物
2007.04~2013.03.
透過型浄化バリアによる地下水汚染物質のレメディエーション
キーワード:透過型浄化バリア、地下水、汚染物質、レメディエーション
2003.03.
マンガン酸化微生物によるバイオレメディエーション
キーワード:マンガン酸化微生物、バイオミネラリゼーション、ナノポア、環境浄化、バイオレメディエーション
2001.04.
従事しているプロジェクト研究
Progress 100 (戦略的パートナーシップ加速型):グリーンマテリアルの開発のための実験とDFTの融合研究 ~粘土鉱物を空間制御リアクターとした可視光触媒~
2019.04~2022.03, 代表者:笹木圭子, 九大, 日本
本学地球資源システム工学は、分野別QSランキングでの現在23位であるが、10位以内へのランクインの壁を越えるには、AIやDFTのような全く異なる新手法との効果的融合によって、普遍的な原理・法則の発見につながる魅力ある新機軸を立てる戦略が必要である。米国ペンシルバニア州立大学(Penn State)は、世界大学ランキング2018 THE77位、QS93位に位置するが、ジオサイエンスでは全米2位を誇る。Penn State材料科学研究所にてDFTを専門とする新進気鋭の研究者Dabo Ismaila准教授のグループ(4名)と共同して「粘土鉱物を空間制御リアクターとした可視光触媒の開発」について研究を進めることにより、実験とDFTとの融合研究を拡張し、本学のジオサイエンスに強い影響を与え、新基軸の開拓につなげる。
本プログラムでは、化学的に安定な単なるサポートと考えられている粘土鉱物が光触媒と複合化したときの役割を第一原理計算から解き明かそうとするものである。九大側で複合体の合成、キャラクタリゼーション、光触媒活性評価を実験により行うのに対して、Penn State側では、粘土鉱物のフェルミ準位、価電子帯、伝導帯のエネルギー準位を第一原理計算(DFT)および電気陰性度によるgravimetric計算によって求め、複合体中の複雑な励起電子の輸送経路および汚染物質の酸化分解あるいは還元の機構を推定し、粘土鉱物の新しい特性を明らかにする。環境材料工学、資源循環工学だけではなく、天然鉱物を扱っていることによって、太陽光が非常に強かった地球誕生期の生命の起源に粘土鉱物がどうかかわっていたかなどのビッグピクチュアに発展しうる生命地球化学にも波及効果をもつ。.
研究拠点基盤形成 "Advanced Research Network for Biohydrometallurgy of Double Refractory Gold Ore"
2020.04~2023.03, 代表者:Keiko Sasaki, Kyushu University, JSPS (Japan)
本研究拠点の形成では、「機構解明をめざす方向」と「実用化をめざす方向」の二つに焦点を当てている。機構解明では装置の充実やその解析経験の蓄積から九州大学(KU)とケープタウン大学(UCT)が、実用化に向けた取り組みはKU とガーナ鉱山工科大学(UMaT)を中心として取り組む。若手研究者育成の観点から、博士後期課程大学院生やポスドクを連携機関相互に長期滞在を可能とする.
Application of fungal enzyme reactions to biomineral processing of refractory carbonaceous mineral ores
2019.04~2021.03, 代表者:笹木圭子, 九州大学, 日本 JSPS
炭素質を含む難処理金鉱石(DRGO)に酵素反応を利用する前例は、実用レベルでは皆無であり、研究レベルにおいても数例しかない。Ofori-Sarpongらは白色腐朽菌Phanerochaete chrysosporiumが放出する粗酵素を用いて、DRGOの分解を試み、一連の研究をいくつかの論文に公表している(2010, 2011, 2013)。その結果として硫化鉱物の酸化溶解を定量的に明らかにし、固体残渣へのシアン金錯体の吸着量が減少することをつきとめているが、肝心の炭素質の質的変化については、直接調べられていない。Liuら(2016)もまた、Ofori-Sarpongらと同じ白色腐朽菌を用い、単体炭素をDRGO中の炭素質のモデルとして分解しているが、分解後の炭素質の特性化は赤外吸収スペクトルと走査電子顕微鏡像によって定性的にしか調べられておらず、いずれも定量的議論に欠けている。本研究がめざしているものは、酵素反応の一定条件のもとで、どれくらいの芳香族炭化水素を分解できるか、分解産物を一定の洗浄方法で取り除いたうえで、Au(CN)2-吸着量をどれくらい減じることができるか、という定量的関係を見出したうえで、90%以上の金回収率を達成する条件を明らかにすることである。.
層状鉱物への異種イオンのインターカレーションによる生成自由エネルギーのDFT計算
2017.12~2018.05, 代表者:笹木圭子, 九州大学, 米国ペンシルバニア州立大学
層状鉱物(ハイドロカルマイト)への異種イオンのインターカレーションによる生成自由エネルギーのDFT計算を米国ペンシルバニア州立大学で行い、九州大学の実験結果を理論的に裏付けられるかどうかを確認している。2週間に一度のSkype会議を通して進捗状況を共有している。それぞれ博士課程の大学院生2名ずつを伴って共同研究をしている。.
LA-ICP-MS分析を利用したフライアッシュに由来する有害元素の不動化機構の解明
2016.11~2017.10, 代表者:笹木圭子, 九州大学.
NSF-JSPS サマープログラム
2015.06~2015.08, 代表者:笹木圭子, 九州大学, 九州大学(日本)
NSFとのマッチングファンドにより、バージニア州立大学(米国)から博士課程の大学院生を3ヶ月受け入れ、微生物反応によって合成されたマンガン酸化物の環境材料としての活用に関して共同研究を実施した。.
JST SAKURAプログラム
2015.11~2015.12, 代表者:永島英夫, 九州大学, 九州大学(日本)
マヒドン大学理学部准教授を3週間受け入れ、共同研究を実施した。.
Progress 100 世界トップクラス研究者招聘事業
2014.04~2016.03, 代表者:笹木圭子
本研究では、難分解性有害オキソ陰イオンに対する新規吸着剤を有機修飾粘土により開発する。粘土鉱物は陽イオン交換体であり、陽イオン界面活性剤の炭素鎖の長さや形状がミセル構造の安定性と求電子性に与える影響がこの材料開発の鍵となる。ジオサイエンスで定評あるペンシルバニア州立大学(2013年世界大学ランキング49位)のコロイド界面科学の専門家Kwadwo Osseo-Asare著名教授を招聘し、研究討論およびセミナーを通して、この分野の研究と教育の国際化を進める。さらにこちらからも同大学を訪問し、量子シミュレーション、粘土科学の専門家とも研究討論し、両者のユニットによる共同研究を多核的に進め、成果を環境材料分野の国際誌で公表する。わが国では数少ない地球資源システム工学専攻をもつ九州大学が、ジオサイエンス分野全米No.2を誇るペンシルバニア州立大学のコロイド界面科学を専門とする著名教授による特別講義を学生に提供することにより、研究のみならず、教育へのインセンティブも創出する。.
バイオテンプレートによるリチウムイオンシーブの合成と集積化
2015.04~2018.03, 代表者:笹木圭子
真菌合成低結晶層状マンガン酸化物に由来するLi+イオン吸着体を、生体親和性の高い炭素繊維
上で真菌を増殖させたバイオマスコートの表面に担持し、高イオン選択性のリチウムイオンシー
ブの合成と集積化を達成させる。生体鉱物のユニークな特性である低結晶性、高有機物含有率、
ミクロ形状、相転移性を利用し、炭素繊維とスピネル結晶のコンポジットをつくる。生体鉱物を
前駆体とした環境材料の優位性を抽出するとともに、これを形状設計自在な支持体上に配列する
ことにより集積化の自由度を高め、南米の塩湖・かん水や日本の地熱水中の未利用リチウム資源
の回収へ向けたバイオミネラリゼーションによる環境材料のイノベーションをはかる。.
放射性核種埋設に向けたジオミメティクスに由来する吸着材の開発
2016.04~2019.03, 代表者:笹木圭子, 九州大学.
新官能基の探索
2014.02~2014.02, 代表者:笹木圭子, 九州大学.
地熱水から回収したアモルファスシリカの活用
2013.03~2014.04, 代表者:Anggoro Mursito, LIPI, Indonesia.
Colloids and Interface Science in Nano-Hydrometallurgy
2011.04~2012.03, 代表者:笹木圭子, 九州大学, 九州大学.
Microbially induced immobilization of metalloid elements
2011.04~2012.03, 代表者:笹木圭子, 九州大学, 九州大学.
JICA AUN-SEED/Net
2009.02~2010.05, 代表者:丹治保典, 東京工大, 日本.
British Biological Science Research Council-Japan Partnering Award (BBSRC-JP)
2004.04~2009.03, 代表者:Lynne Makaskie, University of Birmingham, UK.
未利用炭素資源活用によるバイオコールエコ燃料製造システムの開発
2009.04~2012.03, 代表者:平島剛, 九州大学.
微生物機能により合成されたマンガン酸化物に対するレアアース元素の選択吸着
2009.04~2011.03, 代表者:平島剛, 九州大学.
湿式製錬技術開発事業に係る共同研究
2008.10~2010.03, 代表者:笹木圭子
表面分析による不動態化の解明.
ヒ素含有坑廃水発生源対策調査研究
2008.07~2009.03, 代表者:笹木圭子.
銅鉱石からのヒ素の除去技術に関する研究
2007.05~2008.02, 代表者:笹木圭子, 九州大学, (独)石油天然ガス・金属鉱物資源機構(JOGMEC)(日本).
アジア圏におけるバイオコールコプロダクションシステムの開発(科研:基盤(A))
2006.04~2009.03, 代表者:平島剛, 九州大学, 日本学術振興会(日本)
アジア圏におけるバイオコールコプロダクションシステムの開発.
透過型浄化壁における微生物群集構造の長期モニタリング(科研:萌芽)
2007.04~2009.03, 代表者:平島 剛, 九州大学, 日本学術振興会(日本).
低酸素環境におけるマンガンのバイオミネラリゼーション(科研:萌芽)
2006.04~2009.03, 代表者:笹木圭子, 九州大学, 日本学術振興会(日本).
都市域の廃棄物資源化拠点としてのアーバンマインの構築とそのホロニックパス(科研・基盤研究A)
2004.04~2008.03, 代表者:恒川昌美, 北海道大学, 北海道大学
ホロニックな資源循環システムを構築するために、拠点としてのアーバンマインにおける資源化技術の開発と持続可能な資源循環システムの具体化に取り組む。.
生体鉱物の特性を生かした地下水・土壌汚染修復技術の新展開(科研・基盤研究B)
2004.04~2008.03, 代表者:笹木圭子, 九州大学, 九州大学
マンガン酸化カビにより合成したマンガン酸化物が多孔質で化学合成品よりはるかに活性が高いことから、地下水や土壌中の重金属イオンの吸着や難分解性有機物質の分解への適用性を明らかにしていく。.
ヒ素汚染土壌のバイオレメエディエーション(科研・萌芽研究)
2005.04~2007.03, 代表者:笹木圭子, 九州大学, 九州大学
帯水層中のヒ素の不動化において、嫌気性微生物の寄与を明らかにしていく。.
バイオマスおよび未利用低品位炭を利用した環境付加低減型スラリー燃料の開発(科研・基盤研究B)
2003.04~2007.03, 代表者:平島 剛, 九州大学, 九州大学
再生可能エネルギーの中で最も期待されているバイオマスと膨大に賦存する未利用低品位炭を水熱反応により混合改質・脱水し、バイオマス・石炭混合スラリー燃料製造法を開発しようとする物である。.
人工湿地の生態系を利用した重金属汚染水の浄化に関する研究
2002.04~2004.03, 代表者:荻野激, 北海道立地質研究所, 北海道立地質研究所
人工的に建設した湿地において、重金属イオン汚染水を導入し、植物への吸収、微生物による固定化、化学的析出などの複合作用により浄化していくしくみを研究する。.
研究業績
主要著書
1. Keiko Sasaki, Kojo Twum Konadu, "Biotechnological approaches to facilitate gold recovery from double refractory gold ores" in "Biotechnology in Mining and Metallurgical Industry" edited by Prof. Hongbo Zhao, Intech Open, 2020.10.
2. Paulmanickam Koilraj, Keiko Sasaki, 2D/2D graphene oxide-layered double hydroxide nanocomposite for the immobilization of different radionuclides, Wiley, 2020.09.
3. Binglin Guo, Keiko Sasaki, Low Carbon Stabilization and Solidification (S/S) of Hazardous Wastes, Elsevier, 2020.09.
4. N. Muthuchamy, S. Karthikeyan, Kang Hyun Park, Keiko Sasaki, Adam F. Lee, Nanoscale Materials with Different Dimensions for Advanced Electrocatalysts, , Elsevier, in press, 2020.02.
5. Keiko Sasaki, Qianqian Yu, Manganese oxides in Environments, American Chemical Society Symposium Series, 2014.11.
6. Keiko Sasaki, Microbiology for Minerals, Metals, Materials and Environment, CRC Press/ Taylor and Francis.
主要原著論文
1. Binglin Guo, Quanzhi Tian, Tsubasa Oji, Lei Wang, Daniel C.W. Tsang, Keiko Sasaki,, Hydroxylated calcined dolomite as an effective and sustainable substitute of lime to precipitate as ettringite for treatment of selenite/selenate contaminated wastewater, Colloids Surf., A, in press., 2020.07.
2. Li Zhang, Srinivasarao Kanchela, Keiko Sasaki, Synthesis and characterization of imidazole-bearing polymer modified montmorillonite for adsorption of perchlorate, Appl. Clay Sci., in press, 2020.07.
3. Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima; Hajime Miki; Keiko Sasaki, Bubble interactions with chalcopyrite and molybdenite surfaces in seawater, Minerals Engineering, https://doi.org/10.1016/j.mineng.2020.106536, 157, 106536, 2020.07.
4. Keishi Oyama, Kazuhiko Shimada, Jun-ichiro Ishibashi, Keiko Sasaki, Hajime Miki, Naoko Okibe,, Catalytic mechanism of activated carbon-assisted bioleaching of enargite concentrate, Hydrometallurgy

, doi.org/10.1016/j.hyc!romet.2020.105417, 196, 105417, 2020.07.
5. Keiko Sasaki, Yoshikazu Hayashi, Takeshi Nakamura, Binglin Guo, Quanzhi Tian, Stabilization of borate by hot isostatic pressing after co-precipitation with hydroxyapatite using MAP, Chemosphere, 10.1016/j.chemosphere.2020.126860, 254, 2020.09, [URL], Boric acid is one of the most mobile inorganic contaminant species in nature due to its pKa of 9.23. Co-precipitation of borate with hydroxyapatite (HAp: Ca5(PO4)3OH) facilitates the simultaneous removal of borate with co-existing oxoanions in natural waters. The cost of phosphate is an impediment to industrialize the co-precipitation of borate with HAp for treatment of geothermal waters. In the present work, an inexpensive industrial by-product of magnesium ammonium phosphate (MAP) derived from sewage sludge, was examined as a phosphate source. MAP includes 89% pure magnesium ammonium phosphate, resulting in better performance than the pure chemical form of NH4H2PO4, because Mg2+ and Al3+ (trace elements in MAP product) play roles in enhancing the removal rate of borate and lowering the equilibrium borate concentration. These ions have a good affinity with phosphate to nucleate crystal seeds independently of powdery Ca sources. To reduce the bulky volume of solid residues, hot isostatic pressing (HIP) was applied. There is structural water in HAp; therefore, the greatest volume reduction was achieved with 78.3 ± 2.0% (n = 3). Additionally, a synergic effect to suppress the released borate, greater than the sequential combination of calcination and cold isostatic pressing was accomplished in the toxicity contents leaching procedure (TCLP) test. This is not due to larger crystal sizes alone, but it is derived from boron stabilization in HAp at an atomic level by the synergic effect of heating and pressing simultaneously..
6. Ahmad T. Yuliansyah, · Satoshi Kumagai, · Tsuyoshi Hirajima, · Keiko Sasaki, Production of valuable chemicals from oil palm biomass using hot‑compressed water method, J. Mater. Cycles Waste Manage., https://doi.org/10.1007/s10163-020-01073-8, in press, 2020.07.
7. Quanzhi Tian, Binglin Guo, Keiko Sasaki, Influence of silicate on the structural memory effect of layered double hydroxides for the immobilization of selenium, Journal of Hazardous Materials, 10.1016/j.jhazmat.2020.122674, 395, 2020.08, [URL], The influence of silicate on the structural memory effect of layered double hydroxides (LDHs) has been rarely reported. In this study, five kinds of calcined LDHs (CLDHs) were synthesized and used as adsorbents for the sorption of selenium with or without silicate, under the initial pH 10 and 13, respectively, characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), infrared spectroscopy (IR), nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), and N2 adsorption-desorption isotherm. The results indicated that silicate can significantly affect the phase transformation of CLDHs, and the sorption amounts of selenite and selenate dramatically decreased in the presence of silicate. Specifically, silicate can react with MgO and Al2O3 in CLDHs to generate magnesium silicate hydrate and geopolymer-like substance which were covered on the surface of particles, blocking the hydroxylation of metal oxides. However, higher pH suppressed the interaction between MgO and silicate and enhanced the formation of geopolymer-like substance, which promoted the regeneration of LDHs. Al in CLDHs plays a critical role in the regeneration of LDHs. Besides, the ternary oxides (CLDH-2, Mg2Al0.75Fe0.25-oxide; CLDH-3, Mg2Al0.5Fe0.5-oxide) possessed larger specific surface areas (127.7 and 158.2 m2/g) and consequently presented more resistance to the effect of silicate..
8. Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Shigeto Kuroiwa, Yuji Aoki, Effect of H2O2 and potassium amyl xanthate on separation of enargite and tennantite from chalcopyrite and bornite using flotation, Minerals Engineering, 10.1016/j.mineng.2020.106371, 152, 2020.06, [URL], Effect of oxidation treatment using hydrogen peroxide (H2O2) on the floatability of copper sulfide minerals (i.e., chalcopyrite and bornite) and arsenic-bearing copper minerals (i.e., tennantite and enargite) is reported in this study. Pure mineral flotation shows that the floatability of each mineral significantly decreases after the oxidation treatment. Interestingly, flotation of mixed mineral of copper sulfide and arsenic-bearing copper minerals shows that enargite and tennantite exhibit a higher floatability compared to chalcopyrite and bornite after the oxidation treatment followed by the addition of potassium amyl xanthate (PAX). These flotation results indicate a possibility for selective flotation of copper sulfide and arsenic-bearing copper minerals. Indeed, bench-scale flotation tests show that the oxidation treatment using H2O2 and the addition of PAX can deliver a satisfying separation of copper sulfide and arsenic-bearing copper minerals. Difference oxidation products (i.e., CuO, Cu(OH)2, CuSO4, FeOOH, and Fe2(SO4)3) on each mineral surface are likely the cause of this different flotation behavior. Furthermore, these oxidation products may affect the adsorption amount of PAX on each mineral. Indeed, the adsorption tests show that PAX is adsorbed more on tennantite, bornite, and enargite compared to chalcopyrite owing to the formation of CuSO4 and Cu(OH)2 on the mineral surfaces under oxidizing conditions. A possible mechanism is proposed in this study to explain the selective flotation behavior of mixed minerals..
9. Quanzhi Tian, Binglin Guo, Chitiphon Chuaicham, Keiko Sasaki, Mechanism analysis of selenium (VI) immobilization using alkaline-earth metal oxides and ferrous salt, Chemosphere, 10.1016/j.chemosphere.2020.126123, 248, 2020.06, [URL], The immobilization of selenate (SeO42–) using metal oxides (CaO and MgO) and ferrous salt as the immobilization reagents were examined by the leaching test and solid-phase analysis via XRD, XAFS, TGA, and XPS. The results indicated that nearly all of SeO42– was reduced to SeO32– in the CaO-based reaction within 7 days. Then, the generated SeO32– was mainly sorbed onto the iron-based minerals (Fe2O3 and FeOOH) through the formation of both bidentate mononuclear edge-sharing (1E) and monodentate mononuclear corner-sharing (1V) inner-sphere surface complexes, suggested by PHREEQC simulation and EXAFS analysis. Differently, less amount of SeO42– (approximately 45.50%) was reduced to SeO32– for the MgO-based reaction. However, if the curing time increases to a longer time (more than 7 days), the further reduction could occur because there are still Fe(II) species in the matrix. As for the associations of Se in the solid residue, most of the selenium (SeO32– and SeO42–) was preferentially distributed onto the Mg(OH)2 through outer-sphere adsorption. Definitely, this research can provide a deep understanding of the immobilization of selenium using alkaline-earth metal oxide related materials and ferrous substances..
10. Subbaiah Muthu Prabhu, Keiko Sasaki, S. SD Elanchezhiyan, G. Paruthimal Kalaignan, Chang Min Park, Self-tuning tetragonal zirconia-based bimetallic nano(hydr)oxides as superior and recyclable adsorbents in arsenic-tolerant environment
Template-free in and ex situ synthetic methods, stability, and mechanisms, Chemical Engineering Journal, 10.1016/j.cej.2020.124573, 390, 2020.06, [URL], In this study, we aimed to decorate nano-ZrO2 on LaOx to enhance the architectural stability of LaOx for the uptake of both arsenate and arsenite in single solutions. LaOx was obtained as lanthanum methanoate (LaMe) from a simple solvothermal reaction of lanthanum and benzoic acid. The leaving group of formic acid was used as a reducing agent to grow ZrO2 over LaOx, which resulted in a nanocomposite denoted as ZrO2@x%LaMe. The de-arsenic behavior of this composite was compared with that of one-pot-synthesized La-ZrO2 and ZrO2@x%La(OH)3, with La(OH)3 being obtained commercially. Powder X-ray diffraction patterns showed that the ZrO2 structure was transformed from monoclinic to tetragonal during the formation of ZrO2@x%LaMe, La-ZrO2, and ZrO2@x%La(OH)3. Among the synthesized nano-bimetallic composites, ZrO2@50%LaMe exhibited the highest adsorption densities for both arsenate and arsenite due to the uniform distribution of ZrO2 over the LaOx surface resulted in a larger Brunauer–Emmett–Teller specific surface area and a higher zeta potential charge. The synthesized nanocomposites were reused several times with the aid of 0.1 M HNO3 for maximizing the uptake of both arsenate and arsenite from water. Selectivity and the stability (pH) studies indicated that the nanocomposites were highly selective and showed zero-dissolution behavior, respectively. The results of this study suggested that these nanocomposites could be used as alternatives for many La-based adsorbent materials in practical applications..
11. Binglin Guo, Yuta Kamura, Paulmanickam Koilraj, Keiko Sasaki, Co-sorption of Sr2+ and SeO42- as the Surrogate of Radionuclide by Alginate-encapsulated Graphene Oxide-Layered Double Hydroxide Beads, Environmental Research, in press., 2020.05.
12. Kojo T. Konadu, Kojo, Diego M. M. Flores, Ryotaro Sakai, Robert J. Huddy, Susan T. L. Harrison, Takashi Kaneta, Keiko Sasaki, Biological pretreatment of carbonaceous matter in double refractory gold ores: a review and some future considerations, Hydrometallurgy, accepted, 2020.05.
13. Quanzhi Tian, Binglin Guo, Keiko Sasaki, Addition of calcined hydrotalcite into geopolymer pastes activated by different alkaline solutions for immobilization of selenium: influence and mechanism analysis, J. Hazard. Mater., https://doi.org/10.1016/j.jhazmat.2019.121880, 387, 121994 , 2020.05.
14. Seonyi Namgung, Binglin Guo, Keiko Sasaki, Sang Soo Lee, Giehyeon Lee, Macroscopic and microscopic behaviors of Mn(II) (ad)sorption to goethite with the effects of dissolved carbonates under anoxic conditions, Geochimica et Cosmochimica Acta, 10.1016/j.gca.2020.03.036, 277, 300-319, 2020.05, [URL], Manganese and its compounds have been extensively studied because of their far-reaching roles in a wide range of biogeochemical processes in natural systems. The (ad)sorption behavior of Mn(II), however, is poorly understood despite its important role as the primary reaction step for surface-catalyzed Mn(II) oxidation that is the principal abiotic process forming various Mn (oxyhydr)oxides in nature. Here, we systematically examined Mn(II) (ad)sorption to one of the most common natural sorbents, goethite, in oxygen- and carbonate-free systems. Traditional sorption edge and isotherm experiments were conducted by varying sorbate-to-sorbent ratio (0.027–15 μmol∙m−2) and solution pH (pH 5.0–9.0). The effects of dissolved carbonates on Mn(II) sorption were also assessed in a range of naturally prevalent concentrations (0.5–10 mM NaHCO3). The Mn(II) uptake on goethite followed a typical Langmuir isotherm in the absence of dissolved carbonates, with increasing maximum adsorption capacities (Γmax) from 0.19 at pH 6.5 to 3.4 μmol∙m−2 at pH 9.0. The presence of dissolved carbonates raised the extent of Mn(II) adsorption, which appeared to be directly correspondent to that of the adsorption of dissolved carbonates. Extended X-ray absorption fine structure (EXAFS) analysis indicated that Mn(II) predominantly formed inner-sphere binuclear bidentate surface complexes. Mn(II) uptake became deviated from the Langmuir model and showed a clear indication of surface precipitation when the Mn(II) sorption density (Γ) exceeded a threshold value in a given solution composition. This secondary Mn(II) phase was identified as rhodochrosite using X-ray diffraction (XRD) and transmission electron microscope (TEM). Additionally, it would be plausible that a minor fraction of adsorbed Mn(II) coexisted with the secondary rhodochrosite according to a linear combination fitting (LCF) of the X-ray absorption near edge structure (XANES) spectra of Mn reference and samples. These systematic investigations of the macroscopic and microscopic behaviors of Mn(II) (ad)sorption to goethite provide a critical avenue for disentangling surface-catalytic Mn(II) oxidation processes, which ultimately lead to the formation of diverse Mn (oxyhydr)oxides in the environment..
15. Keiko Sasaki, Yoshikazu Hayashi, Takeshi Nakamura, Binglin Guo, Quanzhi Tian, Stabilization of borate by hot isostatic pressing after coprecipitation with hydroxyapatite using MAP, Chemosphere, in press, https://doi.org/10.1016/j.chemosphere.2020.126860, 2020.04.
16. Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima; Hajime Miki; Keiko Sasaki, Effect of H2O2 and potassium amyl xanthate on separation of enargite and tennantite from chalcopyrite and bornite using flotation, Minerals Engineering, in press, 2020.04.
17. Seonyi Namgung, Binglin Guo, Keiko Sasaki, Sang Soo Lee, Giehyeon Lee, Macroscopic and microscopic behaviors of Mn(II) (ad)sorption to goethite with the effects of dissolved carbonates under anoxic conditions , Geochimica et Cosmochimica Acta, https://doi.org/10.1016/j.gca.2020.03.036, 277, 300-319, 2020.04.
18. Chitiphon Chuaicham, Sekar Karthikeyan, Radheshyam R. Pawar, Yihuang Xiong, Ismaila Dabo, Bunsho Ohtani, Yoonyoung Kim, Jun Tae Song, Tatsumi Ishihara, Keiko Sasaki, Energy-resolved distribution of electron traps for O/S-doped carbon nitrides by reversed double-beam photoacoustic spectroscopy and the photocatalytic reduction of Cr(vi), Chemical Communications, 10.1039/c9cc09988c, 56, 26, 3793-3796, 2020.04, [URL], We report for the first time to our knowledge the identification of heteroatom-doped and undoped C3N4 with the energy-resolved distribution of electron traps (ERDT) near the conduction band bottom position (CBB) using reversed double-beam photoacoustic spectroscopy. The ERDT/CBB pattern is used to classify the type of elemental doping in C3N4, related to photocatalytic efficiency..
19. Quanzhi Tian, Binglin Guo, Keiko Sasaki, Immobilization mechanism of Se oxyanions in geopolymer
Effects of alkaline activators and calcined hydrotalcite additive, Journal of Hazardous Materials, 10.1016/j.jhazmat.2019.121994, 387, 2020.04, [URL], Geopolymers have been widely adopted to stabilize the cationic pollutants. However, few studies have focused on the immobilization of anionic species. In this study, the immobilization of SeO32– and SeO42– was explored for the first time using geopolymer activated by different alkaline solutions (NaOH and Na2SiO3) with and without calcined hydrotalcite (CHT), characterized by TCLP, XRD, FTIR, TG, NMR, XAFS, and N2 adsorption-desorption isotherm. Na2SiO3-activated geopolymers without CHT additive showed lower leaching percentages of SeO32– and SeO42– (approximately 10 % and 18 %) than NaOH-activated geopolymers (approximately 58 % and 74 %). It has been proven that electrostatic interaction is the main association mode of SeO32– and SeO42– in both NaOH- and Na2SiO3-activated geopolymers. Hence, compactness plays a vital role in the Se leaching from geopolymer. The addition of CHT reduced the compactnesses of both NaOH- and Na2SiO3-geopolymers. Due to the formation of hydrotalcite, the CHT additive contributed to immobilize SeO32– and SeO42– in NaOH-activated geopolymers. However, this phenomenon was not observed in Na2SiO3-activated geopolymers. Thus, the leaching amount of Se greatly increased from Na2SiO3-activated geopolymers with CHT additive. This study provides new insights on the application of geopolymer to immobilize anionic pollutants..
20. Sekar Karthikeyan, Kassam Ahmed, Amin Osatiashtiani, Adam F. Lee, Karen Wilson, Keiko Sasaki, Ben Coulson, Will Swansborough-Aston, Richard E. Douthwaite, Wei Li, Pompon Dahlia-like Cu2O/rGO Nanostructures for Visible Light Photocatalytic H2 Production and 4-Chlorophenol Degradation, ChemCatChem, 10.1002/cctc.201902048, 12, 6, 1699-1709, 2020.03, [URL], Hierarchical Cu2O nanospheres with a Pompon Dahlia-like morphology were prepared by a one-pot synthesis employing electrostatic self-assembly. Nanocomposite analogues were also prepared in the presence of reduced graphene oxide (rGO). Photophysical properties of the hierarchical Cu2O nanospheres and Cu2O/rGO nanocomposite were determined, and their photocatalytic applications evaluated for photocatalytic 4-chlorophenol (4-CP) degradation and H2 production. Introduction of trace (<1 wt %) rGO improves the apparent quantum efficiency (AQE) at 475 nm of hierarchical Cu2O for H2 production from 2.23 % to 3.35 %, giving an increase of evolution rate from 234 μmol.g−1.h−1 to 352 μmol.g−1.h−1 respectively. The AQE for 4-CP degradation also increases from 52 % to 59 %, with the removal efficiency reaching 95 % of 10 ppm 4-CP within 1 h. Superior performance of the hierarchical Cu2O/rGO nanocomposite is attributable to increased visible light absorption, reflected in a greater photocurrent density. Excellent catalyst photostability for >6 h continuous reaction is observed..
21. Chitiphon Chuaicham, Radheshyam Rama Pawar, Sekar Karthikeyen, Bunsho Ohtani , Keiko Sasaki, Fabrication and characterization of ternary sepiolite/g-C3N4/Pd composites for improvement of photocatalytic degradation of ciprofloxacin under visible light irradiation, Journal of Colloid and Interface Science, in press, 2020.02.
22. Ryotaro Sakai, Kojo T. Konadu, Diego M.M. Flores, Susan H. L. Harrison, Keiko Sasaki, Effect of carbonaceous matter on bioleaching of Cu from chalcopyrite ore, Hydrometallurgy, 2020.02.
23. Subbaiah Muthu Prabhu, Keiko Sasaki, S.S D. Elanchezhiyan, G. Paruthimal Kalaignan, Self-tuning tetragonal zirconia-based bimetallic nano(hydr)oxides as superior and recyclable adsorbents in arsenic-tolerant environment: Template-free in and ex situ synthetic methods, stability, and mechanisms, Chemical Engineering Journal, 2020.02.
24. Wuhui Luo, Qidong Huang, Philip Antwi, Binglin Guo, Keiko Sasaki, Synergistic effect of ClO4− and Sr2+ adsorption on alginate-encapsulated organo-montmorillonite beads: Implication for radionuclide immobilization, Journal of Colloid and Interface Science, 560, 2020, 338-348, 2020.02.
25. Quanzhi Tian, Binglin Guo, Chitiphon Chuaicham, Keiko Sasaki, Mechanism analysis of selenium (VI) immobilization using alkalineearth metal oxides and ferrous salt, Chemosphere, https://doi.org/10.1016/j.chemosphere.2020.126123, 248, 126123, 2020.02.
26. Chitiphon Chuaicham, Sekar Karthikeyan, Jun Tae Song, Tatsumi Ishihara, Bunsho Ohtani, Keiko Sasaki, Importance of ZnTiO3 Phase in ZnTi-Mixed Metal Oxide Photocatalysts Derived from Layered Double Hydroxide, ACS Applied Materials and Interfaces, 10.1021/acsami.9b18785, 12, 8, 9169-9180, 2020.02, [URL], In this study, ZnTi-mixed metal oxides (ZTM), such as ZnTiO3, were synthesized from ZnTi layered double hydroxides by varying the molar ratio of Zn/Ti, calcination temperatures, and synthesis methods (hydrothermal or reflux). The surface electronic characteristics of ZTM were investigated by the energy-resolved distribution of electron traps (ERDTs) using reversed double-beam photoacoustic spectroscopy. The ZTM samples obtained by conducting hydrothermal synthesis at 500 °C showed similar ERDT patterns independent of the molar ratio of Zn/Ti, although ZnTiO3 phase was not observed in the X-ray diffraction pattern, when the Zn/Ti ratio was high. When the ERDT patterns demonstrated a high electron accumulation level near the conduction band bottom in hydrothermal products at 500 °C, a higher photocatalytic phenol degradation efficiency was observed due to the formation of ZnTiO3 phase. This suggested that the product with the high Zn/Ti molar ratio (Zn/Ti = 6) constituted amorphous ZnTiO3.The enhanced photocatalytic performance of ZTM could be attributed to the heterojunction of electrons among ZnO, TiO2, and ZnTiO3, which enabled electron transfer in the composites, prevented charge recombination, and promoted a wider visible light adsorption by ZnTiO3 phase irrespective of its crystallinity..
27. Wuhui Luo, Qidong Huang, Philip Antwi, Binglin Guo, Keiko Sasaki, Synergistic effect of ClO4 and Sr2+ adsorption on alginate-encapsulated organo-montmorillonite beads
Implication for radionuclide immobilization, Journal of Colloid And Interface Science, 10.1016/j.jcis.2019.10.049, 560, 338-348, 2020.02, [URL], Perchlorate (ClO4 ) and pertechnetate (TcO4 ) exhibit similar adsorption characteristics on alkyl quaternary ammonium-modified montmorillonite (Mt), and 99mTcO4 normally coexists with 90Sr2+ in radionuclide-contaminated water. In this study, hexadecyl pyridinium (HDPy)-modified Mt (OMt) was encapsulated in alginate beads to inhibit HDPy release and simultaneously immobilize ClO4 and Sr2+ ions. The release of HDPy was remarkably reduced (78 times) from OMt after alginate encapsulation. Adsorption of ClO4 and Sr2+ on the obtained composite demonstrated synergistic effects, with adsorption capacities reaching 0.542 and 0.484 mmol/g, respectively. Compared to the single-adsorbate system, adsorption capacities of ClO4 and Sr2+ increased significantly. The characterization of solids using X-ray diffraction, Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy, as well as the chemical analysis of the aqueous solution, demonstrated that HDPy+–COO disintegration accounted for the adsorption synergy. HDPy was extracted from the Mt interlayer space during the synthesis of OMt/alginate and then partially re-intercalated back after interacting with ClO4 during the adsorption of ClO4 and/or Sr2+. In the binary-adsorbate system, the synergy-induced adsorption capacity was superior to many previously reported adsorbents, implying that OMt/alginate beads can be a promising adsorbent for the remediation of aqueous solutions contaminated with multiple radionuclides..
28. Quanzhi Tian, Binglin Guo, Keiko Sasaki, Immobilization mechanism of Se oxyanions in geopolymer: Effects of alkaline activators and calcined hydrotalcite additive, J. Hazard. Mater., doi.org/10.1016/j.jhazmat.2019.121994 , 2020.01.
29. 笹木 圭子,コジョ トワム コナドゥ, 酵素反応を取り入れたグラファイト質難処理金鉱石のバイオミネラルプロセシング, The Micromeritics , 10.24611/micromeritics.2020008, No.63 (2020) 29-36, 2020.01, 金鉱石から金を取り出すには,アルカリ性シアン水溶液にて,安定な金シアン錯体として抽出して濃縮する。ところが,グラファイト質金鉱石では,鉱石に数% のグラファイト質が混ざっているために,シアン錯体の形成段階で,錯イオンがグラファイト質に吸着するために,30–70% の金回収率のロスが生じる。このために,グラファイト質金鉱石は超難処理とされ,開発対象から外れているのが現状である。本稿では,酵素処理をくみこむことによって,グラファイト質金鉱石の金回収率を20% から90% 以上に向上させるバイオプロセスを紹介する。.
30. Chitiphon Chuaicham, Radheshyam R Pawar, Karthikeyen Sekar, Yihuang Xiong, Ismaila Dabo, Bunsho Ohtani, Keiko Sasaki, Energy-resolved distribution of electron traps for O/S-doped carbon nitrides by reversed double-beam photoacoustic spectroscopy and the photocatalytic reduction of Cr(VI), Chemical Communications, in press., 2020.01.
31. Chitiphon Chuaicham, Sekar Karthikeyen, Jun Tae Song, Tatsumi Ishihara, Bunsho Ohtani, Keiko Sasaki, Importance of ZnTiO3 phase in ZnTi-mixed metal oxide photocatalysts derived from layered double hydroxide, ACS Applied Materials & Interfaces, in press., https://doi.org/10.1021/acsami.9b18785, 2019.12.
32. Sekar Karthikeyan,Kassam Ahmed, Amin Osatiashtiani, Adam F. Lee, Karen Wilson, Keiko Sasaki, Ben Coulson, Will Swansborough-Aston, Richard E. Douthwaite, and Wei Li, Pompon Dahlia-like Cu2O/rGO nanostructures for visible light photocatalytic H2 production and 4-chlorophenol degradation, Chem Cat Chem, doi.org/10.1002/cctc.201902048, in press, 2019.12, Hierarchical Cu2O nanospheres with a Pompon Dahlia-like
morphology were prepared by a one-pot synthesis employing
electrostatic self-assembly. Nanocomposite analogues were also
prepared in the presence of reduced graphene oxide (rGO).
Photophysical properties of the hierarchical Cu2O nanospheres and
Cu2O/rGO nanocomposite were determined, and their photocatalytic
applications evaluated for photocatalytic 4-chlorophenol (4-CP)
degradation and H2 production. Introduction of trace (<1 wt%) rGO
improves the apparent quantum efficiency (AQE) at 475 nm of
hierarchical Cu2O for H2 production from 2.23 % to 3.35 %, giving an
increase of evolution rate from 234 μmol.g-1.h-1 to 352 μmol.g-1.h-1
respectively. The AQE for 4-CP degradation also increases from 52 %
to 59 %, with the removal efficiency reaching 95 % of 10 ppm 4-CP
within 1 h. Superior performance of the hierarchical Cu2O/rGO
nanocomposite is attributable to increased visible light absorption,
reflected in a greater photocurrent density. Excellent catalyst
photostability for >6 h continuous reaction is observed.
.
33. Sekar Karthikeyan, Chitiphon Chuaicham, Radheshyam R. Pawar, Keiko Sasaki, Wei Li, Adam F. Lee and Karen Wilson, Template free mild hydrothermal synthesis of core–shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation, Journal of Materials Chemistry A, 10.1039/c9ta07009e, 20737-20777, 7, 2019.12.
34. Quanzhi Tian, K. Sasaki, A novel composite of layered double hydroxide/geopolymer for co-immobilization of Cs+ and SeO4 2− from aqueous solution, Science of the Total Environment, 10.1016/j.scitotenv.2019.133799, 695, 2019.12, [URL], Geopolymers are always considered as promising materials for the treatment of radioactive wastes. In order to extend the application of geopolymer to the immobilization of anionic species, a novel composite of layered double hydroxide/geopolymer (LDH/GEO) was synthesized and applied for cosorption of Cs+ and SeO4 2−. The ability of LDH/GEO to sorb Cs+ was maintained as that of pure GEO, even though the surface of geopolymer was homogeneously covered by the LDH platelets. The sorption of Cs+ onto LDH/GEO composite occurred via ion exchange, which was controlled by particle diffusion. It is different with Cs+ sorption onto pure GEO governed by film diffusion. Therefore, “Pocket diffusion” was proposed for the particle diffusion as the case of LDH/GEO because this kind of diffusion would be restricted in a certain distance around the ring entrance gate due to the amorphous essence of GEO. For SeO4 2− sorption by LDH/GEO, ion-exchange with the interlayer NO3 and surface sorption could be the main mechanisms. Importantly, the sorption speed of SeO4 2− achieved by LDH/GEO composite was much faster than that by pure LDH. In the binary system (Cs++ SeO4 2−), the sorption of Cs+ was slightly suppressed compared to the single system, which might be due to the formation of ion-pair complex of [CsSeO4]. However, it did not have negative effect on the SeO4 2− sorption. In the presence of other cations or anions, the cosorption performances of Cs+ and SeO4 2− were satisfactorily obtained. Furthermore, the Cs+ and SeO4 2- sorption densities were superior to the previously reported values. The combined MgAl-LDH/geopolymer composite could be a promising material for the immobilization of Cs+ and SeO4 2−, and this work would provide guidance for the development of geopolymer-based materials for environmental applications..
35. Shuang Xu; Jiawen Zhao; Qianqian Yu; Xinhong Qiu; Keiko Sasaki, Understanding how specific functional groups in humic acid affect the sorption mechanisms of different calcinated layered double hydroxides
, Chemical Engineering Journal, in press, 2019.11.
36. Shuang Xu, Jiawen Zhao, Qianqian Yu, Xinhong Qiu, Keiko Sasaki, Structure memory effect of layered double hydroxides in the presence of modeled aromatic compounds to natural organic matter, ACS Earth Space Chemistry, 2019.10.
37. Binglin Guo, Yihuang Xiong, Weinan Chen, Sarah A. Saslow, Naofumi Kozai, Toshihiko Ohnuki, Ismaila Dabo, Keiko Sasaki, Spectroscopic and First-Principles Investigations of Iodine Species Incorporation into Ettringite: Implications for Iodine Migration in Cement Waste Forms, J. Hazard. Mater., 10.1016/j.jhazmat.2019.121880, in press, 2019.10.
38. Paulmanickam Koilraj, Rajathsing Kalusulingam, Keiko Sasaki, Arginine and lysine-functionalized layered double hydroxides as efficient sorbents for radioactive Co2+ removal by chelate-facilitated immobilization, Chemical Engineering Journal, 10.1016/j.cej.2019.05.166, 359-369, 2019.10, [URL], An increase in heavy metal contamination in aquatic environments require an efficient sorbent for the removal and reuse of toxic elements. We attempted to synthesize arginine/lysine-functionalized MgAl LDHs in one-pot without using any hazardous alkaline reagents. The LDHs produced at lower temperatures showed larger numbers of amino acids on their surfaces, while these are exchanged with CO32− at higher temperatures. The arginine/lysine present on the surface of LDH enhanced the adsorption of Co2+ and showed the highest adsorption capacity of 1.159 and 1.170 mmol/g for the LDHs functionalized with lysine and arginine, respectively. Kinetics studies indicated that the adsorption of Co2+ occurred by multiple mechanisms. The Co2+ adsorption on these amino acid functionalized LDHs occurs by the formation chelation complex with amino acid, which provide better vicinity of Co2+ to basic LDH that facilitating the enhanced immobilization. The sorption of other divalent metal ions on these arginine/lysine functionalized LDHs followed the order of Co2+ > Ni2+ > Mn2+ > Fe3+. The Co2+ forms diamine-like coordination that is stable on the surface of LDH and causes higher sorption densities, while other metals form partial glycine-like coordination that detaches the amino acid from the surface of LDH, thereby leading to lesser sorption capacity. The conversion of anionic LDH in to a cationic sorbent was successfully fabricated by these arginine/lysine-assisted methods and explored for the remediation of Co2+ from aqueous solution..
39. Quanzhi Tian, Shingo Nakama, Keiko Sasaki, Immobilization of cesium in fly ash-silica fume based geopolymers with different Si/Al molar ratios, Science of the Total Environment, 10.1016/j.scitotenv.2019.06.095, 687, 1127-1137, 2019.10, [URL], Geopolymers are considered as promising matrixes for waste solidification. However, the effects of the Si/Al molar ratio of geopolymer on the immobilization efficiencies for metal ions have not been fully studied and understood. In the present study, geopolymers with different Si/Al ratios were synthesized from coal fly ash and silica fume. Adsorption tests were conducted to evaluate their immobilization efficiencies for Cs+. The results indicated that geopolymer with low Si/Al ratio could have a better immobilization performance for Cs+ than that with high Si/Al ratio. High Si/Al ratio could contribute to a more compact structure of geopolymer. Each sorption process fitted better with the pseudo-second-order model, and all of them were governed by film diffusion. However, the diffusion mode was gradually closed to particle diffusion with the increase in the Si/Al ratio. Both Langmuir and Freundlich models could well fit the sorption data, and the free energy of each sorption process decreased with the increase in the Si/Al ratio according to D-R equation. The distribution of AlO4 tetrahedron in the geopolymer structure plays a significant role in the immobilization of Cs+. Low Si/Al ratio could result in that more AlO4 tetrahedrons distribute in the small rings (+. However, high Si/Al ratio leads to the distribution of AlO4 tetrahedrons mainly in larger rings (≥eight-member), and this could contribute to the high leaching amount of Cs+. In addition, high-temperature treatment could contribute to the formation of nepheline or pollucite in geopolymer matrix. These minerals locked Cs+ in their structures, and the leaching amount of Cs+ was reduced correspondingly from high levels (26.36%, 27.26%, and 66.92%) to very low levels (0.67%, 0.53%, and 0.95%)..
40. Paulmanickam Koilraj, Rajathsing Kalusulingam, Keiko Sasaki, Arginine and lysine-functionalized layered double hydroxides as efficient sorbents for radioactive Co2+ removal by chelate-facilitated immobilization, Chemical Engineering Journal, 10.1016/j.cej.2019.05.166, 359-369, 2019.10, [URL], An increase in heavy metal contamination in aquatic environments require an efficient sorbent for the removal and reuse of toxic elements. We attempted to synthesize arginine/lysine-functionalized MgAl LDHs in one-pot without using any hazardous alkaline reagents. The LDHs produced at lower temperatures showed larger numbers of amino acids on their surfaces, while these are exchanged with CO32− at higher temperatures. The arginine/lysine present on the surface of LDH enhanced the adsorption of Co2+ and showed the highest adsorption capacity of 1.159 and 1.170 mmol/g for the LDHs functionalized with lysine and arginine, respectively. Kinetics studies indicated that the adsorption of Co2+ occurred by multiple mechanisms. The Co2+ adsorption on these amino acid functionalized LDHs occurs by the formation chelation complex with amino acid, which provide better vicinity of Co2+ to basic LDH that facilitating the enhanced immobilization. The sorption of other divalent metal ions on these arginine/lysine functionalized LDHs followed the order of Co2+ > Ni2+ > Mn2+ > Fe3+. The Co2+ forms diamine-like coordination that is stable on the surface of LDH and causes higher sorption densities, while other metals form partial glycine-like coordination that detaches the amino acid from the surface of LDH, thereby leading to lesser sorption capacity. The conversion of anionic LDH in to a cationic sorbent was successfully fabricated by these arginine/lysine-assisted methods and explored for the remediation of Co2+ from aqueous solution..
41. Quanzhi Tian, Shingo Nakama, Keiko Sasaki, Immobilization of cesium in fly ash-silica fume based geopolymers with different Si/Al molar ratios, Science of the Total Environment, 10.1016/j.scitotenv.2019.06.095, 687, 1127-1137, 2019.10, [URL], Geopolymers are considered as promising matrixes for waste solidification. However, the effects of the Si/Al molar ratio of geopolymer on the immobilization efficiencies for metal ions have not been fully studied and understood. In the present study, geopolymers with different Si/Al ratios were synthesized from coal fly ash and silica fume. Adsorption tests were conducted to evaluate their immobilization efficiencies for Cs+. The results indicated that geopolymer with low Si/Al ratio could have a better immobilization performance for Cs+ than that with high Si/Al ratio. High Si/Al ratio could contribute to a more compact structure of geopolymer. Each sorption process fitted better with the pseudo-second-order model, and all of them were governed by film diffusion. However, the diffusion mode was gradually closed to particle diffusion with the increase in the Si/Al ratio. Both Langmuir and Freundlich models could well fit the sorption data, and the free energy of each sorption process decreased with the increase in the Si/Al ratio according to D-R equation. The distribution of AlO4 tetrahedron in the geopolymer structure plays a significant role in the immobilization of Cs+. Low Si/Al ratio could result in that more AlO4 tetrahedrons distribute in the small rings (+. However, high Si/Al ratio leads to the distribution of AlO4 tetrahedrons mainly in larger rings (≥eight-member), and this could contribute to the high leaching amount of Cs+. In addition, high-temperature treatment could contribute to the formation of nepheline or pollucite in geopolymer matrix. These minerals locked Cs+ in their structures, and the leaching amount of Cs+ was reduced correspondingly from high levels (26.36%, 27.26%, and 66.92%) to very low levels (0.67%, 0.53%, and 0.95%)..
42. Paulmanickam Koilraj, Rajathsing Kalusulingam, Keiko Sasaki, Arginine and lysine-functionalized layered double hydroxides as efficient sorbents for radioactive Co2+ removal by chelate-facilitated immobilization, Chemical Engineering Journal, 10.1016/j.cej.2019.05.166, 359-369, 2019.10, [URL], An increase in heavy metal contamination in aquatic environments require an efficient sorbent for the removal and reuse of toxic elements. We attempted to synthesize arginine/lysine-functionalized MgAl LDHs in one-pot without using any hazardous alkaline reagents. The LDHs produced at lower temperatures showed larger numbers of amino acids on their surfaces, while these are exchanged with CO32− at higher temperatures. The arginine/lysine present on the surface of LDH enhanced the adsorption of Co2+ and showed the highest adsorption capacity of 1.159 and 1.170 mmol/g for the LDHs functionalized with lysine and arginine, respectively. Kinetics studies indicated that the adsorption of Co2+ occurred by multiple mechanisms. The Co2+ adsorption on these amino acid functionalized LDHs occurs by the formation chelation complex with amino acid, which provide better vicinity of Co2+ to basic LDH that facilitating the enhanced immobilization. The sorption of other divalent metal ions on these arginine/lysine functionalized LDHs followed the order of Co2+ > Ni2+ > Mn2+ > Fe3+. The Co2+ forms diamine-like coordination that is stable on the surface of LDH and causes higher sorption densities, while other metals form partial glycine-like coordination that detaches the amino acid from the surface of LDH, thereby leading to lesser sorption capacity. The conversion of anionic LDH in to a cationic sorbent was successfully fabricated by these arginine/lysine-assisted methods and explored for the remediation of Co2+ from aqueous solution..
43. Quanzhi Tian, Shingo Nakama, Keiko Sasaki, Immobilization of cesium in fly ash-silica fume based geopolymers with different Si/Al molar ratios, Science of the Total Environment, 10.1016/j.scitotenv.2019.06.095, 687, 1127-1137, 2019.10, [URL], Geopolymers are considered as promising matrixes for waste solidification. However, the effects of the Si/Al molar ratio of geopolymer on the immobilization efficiencies for metal ions have not been fully studied and understood. In the present study, geopolymers with different Si/Al ratios were synthesized from coal fly ash and silica fume. Adsorption tests were conducted to evaluate their immobilization efficiencies for Cs+. The results indicated that geopolymer with low Si/Al ratio could have a better immobilization performance for Cs+ than that with high Si/Al ratio. High Si/Al ratio could contribute to a more compact structure of geopolymer. Each sorption process fitted better with the pseudo-second-order model, and all of them were governed by film diffusion. However, the diffusion mode was gradually closed to particle diffusion with the increase in the Si/Al ratio. Both Langmuir and Freundlich models could well fit the sorption data, and the free energy of each sorption process decreased with the increase in the Si/Al ratio according to D-R equation. The distribution of AlO4 tetrahedron in the geopolymer structure plays a significant role in the immobilization of Cs+. Low Si/Al ratio could result in that more AlO4 tetrahedrons distribute in the small rings (+. However, high Si/Al ratio leads to the distribution of AlO4 tetrahedrons mainly in larger rings (≥eight-member), and this could contribute to the high leaching amount of Cs+. In addition, high-temperature treatment could contribute to the formation of nepheline or pollucite in geopolymer matrix. These minerals locked Cs+ in their structures, and the leaching amount of Cs+ was reduced correspondingly from high levels (26.36%, 27.26%, and 66.92%) to very low levels (0.67%, 0.53%, and 0.95%)..
44. Paulmanickam Koilraj, Rajathsing Kalusulingam, Keiko Sasaki, Arginine and lysine-functionalized layered double hydroxides as efficient sorbents for radioactive Co2+ removal by chelate-facilitated immobilization, Chemical Engineering Journal, 10.1016/j.cej.2019.05.166, 359-369, 2019.10, [URL], An increase in heavy metal contamination in aquatic environments require an efficient sorbent for the removal and reuse of toxic elements. We attempted to synthesize arginine/lysine-functionalized MgAl LDHs in one-pot without using any hazardous alkaline reagents. The LDHs produced at lower temperatures showed larger numbers of amino acids on their surfaces, while these are exchanged with CO32− at higher temperatures. The arginine/lysine present on the surface of LDH enhanced the adsorption of Co2+ and showed the highest adsorption capacity of 1.159 and 1.170 mmol/g for the LDHs functionalized with lysine and arginine, respectively. Kinetics studies indicated that the adsorption of Co2+ occurred by multiple mechanisms. The Co2+ adsorption on these amino acid functionalized LDHs occurs by the formation chelation complex with amino acid, which provide better vicinity of Co2+ to basic LDH that facilitating the enhanced immobilization. The sorption of other divalent metal ions on these arginine/lysine functionalized LDHs followed the order of Co2+ > Ni2+ > Mn2+ > Fe3+. The Co2+ forms diamine-like coordination that is stable on the surface of LDH and causes higher sorption densities, while other metals form partial glycine-like coordination that detaches the amino acid from the surface of LDH, thereby leading to lesser sorption capacity. The conversion of anionic LDH in to a cationic sorbent was successfully fabricated by these arginine/lysine-assisted methods and explored for the remediation of Co2+ from aqueous solution..
45. Wuhui Luo, Qidong Huang, Philip Antwi, Binglin Guo, Keiko Sasaki, Synergistic effect of ClO4− and Sr2+ adsorption on alginate-encapsulated orga-no-montmorillonite beads: Implication for radionuclide immobilization, Journal of Colloid and Interface Science, doi.org/10.1016/j.jcis.2019.10.049, 2019.10.
46. Shuang Xu, Jiawen Zhao, Qianqian Yu, Xinhong Qiu, Keiko Sasaki, Effect of Natural Organic Matter Model Compounds on the Structure Memory Effect of Different Layered Double Hydroxides, ACS Earth and Space Chemistry, 10.1021/acsearthspacechem.9b00175, 3, 10, 2175-2189, 2019.10, [URL], The structural transformation of layered double hydroxides (LDHs) plays an important role in a variety of natural environmental behaviors. As one of the important ways of structure transformation in LDHs, the structure memory effect closely interacted with humic acid (HA). However, the role of functional groups in HA is unclear because its structure is relatively complex. Therefore, seven representative small molecules of single or double aromatic compounds were selected to explore their influence on the regeneration of different LDHs, thereby revealing key function groups in HA. As a result, ortho-benzene compounds could more effectively affect the regeneration of LDHs than other model compounds. For these compounds, the aliphatic chain length and aromatic ring size have little effect on regeneration of LDHs. However, increasing the number of carboxyl or hydroxyl groups affected the results, although all of them accelerated the regeneration rate of LDHs. Additionally, LDHs during the regeneration have a positive adsorption effect on both o-carboxyl and o-hydroxyl aromatic compounds; however, they have shown different effects on the regeneration of LDHs. Phthalic acid revealed no effect on the structure and crystallinity of regenerated LDH, while catechol inhibited the regeneration process and decreased the crystallinity of regenerated LDHs. The effects of o-hydroxyl aromatic compounds, such as catechol, are also dependent upon the type of LDHs. They have an inhibitory effect on the crystallinity of the regenerated Mg-LDH within a short time or with a high concentration but have no effect on its morphology. Although o-hydroxyl aromatic compounds have no effect on the crystallinity of regenerated Ca-LDH, the crystal growth was suppressed. This is due to the difference in the regeneration processes between two LDHs. These results provide a more detailed theoretical basis for understanding the influence of HA on the structural transformation of LDHs or even other minerals, such as hydroxides, in the environment..
47. Kojo T. Konadu, Susan T.L. Harrison, Kwadwo Osseo-Asare, Keiko Sasaki, Transformation of the carbonaceous matter in double refractory gold ore by crude lignin peroxidase released from the white-rot fungus, International Biodeterioration and Biodegradation, 10.1016/j.ibiod.2019.104735, 143, 2019.09, [URL], Sulfides and carbonaceous matter in double refractory gold ore (DRGO) were bio-treated sequentially using an iron-oxidizing archaeon Acidianus brierleyi followed by lignin peroxidase-dominating crude enzymes released from the white-rot fungus Phanerochaete chrysosporium to significantly improve gold recovery from 24% to 92%. Transformation of the carbonaceous matter in the sequential bio-treatment was interpreted with Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN), Raman spectroscopy and three-dimensional fluorescence spectrometry. Firstly, microbiological sulfide oxidation did not affect carbonaceous matter but decreased the arsenic content in the solid residue, facilitating the following enzymatic reaction. Next, the crude enzymes predominantly decomposed the defect-bearing graphitic carbon into humic-like substances. The humic-like substances were not completely soluble under pH 4 but were instead retained in the solid residue as a part of a newly formed carbonaceous aluminosilicate (C–Si–Al) phase. Due to a wide pKa range of humic-like substances, it is proposed that at pH 4, electrostatic interaction between humic substances and illite, with and without heavy metals, might have enabled the agglomeration of fine aluminosilicate particles. Some gold grains trapped in C–Si–Al agglomerates were released by the dissolution of humic-like substances in 1 M NaOH, resulting in a further increase in gold recovery of approximately 15%..
48. Karthikeyan Sekar; Chitiphon Chuaicham,; Radheshyam Pawar,; Keiko Sasaki, Wei Li, Adam Lee, Karen Wilson, Template free mild hydrothermal synthesis of core-shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation, J. Mater. Chem. A, 7, 20767-20777., 2019.09.
49. Sekar Karthikeyan, Chitiphon Chuaicham, Radheshyam R Pawar, Keiko Sasaki, Wei Li, Adam F. Lee, Karen Wilson, Template free mild hydrothermal fabrication of size-controlled core-shell CuO@Cu2O visible light photocatalyst, structural stability and their interfacial charge transfer mechanistic investigation, J. Material Chemistry A, 2019.08, Solar photocatalytic processes are a promising approach to environmental remediation, however their implementation requires improvements in visible light harvesting and conversion and a focus on low cost, Earth abundant materials. Semiconducting copper oxides are promising visible light photocatalysts for solar fuels and wastewater depollution. Here we report the mild, hydrothermal (template-free) synthesis of core-shell Cu2 0(Cu)@Cu0 photocatalytic architectures for the visible light photocatalytic degradation of N-acetyl-para-aminophenol (APAP). Hollow and rattle-like core-shell nanosphere aggregates with diameters between 200 nm and 2.5 µm formed under different synthesis conditions; all comprised an inner Cu2 0 shell, formed of 10-50 nm nanoparticles、surrounded by a protective corona of CuO nanoparticles. High reductant and structure-directing agent concentrations promoted the formation of a yolk-like Cu2 0/Cu core, associated with improved photophysical properties, notably a high oxidation potential and suppressed charge carrier recombination, that correlated with the highest apparent quantum efficiency (8%) and rate of APAP removal (7 µmol g―1 min―1). Trapping experiments demonstrated hydroxyl radicals were the primary active species responsible for APAP oxidation to quinones and short chain carboxylic acids. Rattle-like core-shell Cu2 0/Cu@Cu0 nanospheres exhibited excellent physiochemical stability and recyclability for APAP photocatalytic degradation.
50. Subbaiah Muthu Prabhu, Radheshyam Rama Pawar, Keiko Sasaki, Chang Min Park, A mechanistic investigation of highly stable nano ZrO 2 decorated nitrogen-rich azacytosine tethered graphene oxide-based dendrimer for the removal of arsenite from water, Chemical Engineering Journal, 10.1016/j.cej.2019.03.277, 1474-1484, 2019.08, [URL], We focused to synthesize graphene oxide-polyamidoamine dendrimer, up to 2nd generation, (GO-gen2) via a grafting method and the tethered groups were further covalently functionalized with a nitrogen-rich of an aromatic triazine ring of 5-azacytosine (Aza). Zirconia nanoparticles (ZrO 2 ) has been identified as promising material for removal of AsO 3 3− from water, however, its practical applicability is hindered due to its nanosize. Hence, ZrO 2 was successfully decorated through biomolecule assist on GO-gen2-Aza dendrimer. Various amounts of GO-gen2-Aza were used as stable supports to develop the nanocomposites with ZrO 2 . Then, the adsorption efficiency of highly toxic AsO 3 3− on developed composites was investigated for water treatment. The synthesized GO-dendrimer composites were characterized well before and after adsorption of AsO 3 3− using FTIR, PXRD, SEM, XPS, TGA, TEM and BET analysis. Particle size distribution of ZrO 2 revealed the peak top at 28 nm by zeta potential measurement. During synthesis, the GO sheets of composite were laminated by incorporation of ZrO 2 nanoparticles. The results of the batch experiments showed that ZrO 2 @2%GO-gen2-Aza dendrimer had higher adsorption density of AsO 3 3− than that of other developed forms of dendrimer composites. Langmuir equation well described the adsorption isotherm with the maximum adsorption capacity of 1.075 mmol/g. In addition, the enhanced AsO 3 3− adsorption density on ZrO 2 surface of ZrO 2 @x%GO-gen2-Aza, in which the GO-sheets were delaminated, resulting more ZrO 2 was dispersed homogeneously in the GO-sheets for maximum uptake of AsO 3 3− from water, confirmed by PXRD patterns. These results suggested that the developed GO-based dendrimer materials can be utilised for the practical remediation of toxic AsO 3 3− and other similar types of toxic ions, selenite, phosphate and fluoride from the contaminated water..
51. Quanzhi Tian, Keiko Sasaki, Application of fly ash-based materials for stabilization/solidification of cesium and strontium, Environmental Science and Pollution Research, 10.1007/s11356-019-05612-1, 26, 23, 23542-23554, 2019.08, [URL], Coal fly ash, as a solid waste produced from coal-fired power plants, was recycled for synthesis of zeolite A and geopolymer which were used for stabilization/solidification of Cs+ and Sr2+ from aqueous solutions. Specifically, the sorption data was successfully fitted by kinetic and thermodynamic models. The microstructure changes of zeolite A after loading Cs+ and Sr2+ were explored using XRD, FTIR, Raman, TG-DTA, and N2 adsorption/desorption isotherm. The solidification of the spent zeolites using geopolymer was conducted and evaluated. It was found that pseudo-second sorption mechanism was predominant and, according to the Boyd equation, film diffusion seemed to govern the sorption process. The maximum sorption capacities on Cs+ and Sr2+ based on Langmuir model were 2.12 and 1.93 mmol/g, respectively. During ion exchange with Cs+ and Sr2+, Cs+ was inclined to go through the window to occupy the position of eight-member ring, while the Sr2+ was more likely to replace the Na+ in the six-member ring, thereby easily leading to the different changes of zeolite structure. In addition, geopolymer could be a promising matrix for the treatment of radioactive waste because the leaching fraction greatly decreased after solidification by geopolymer. Therefore, the recycling of coal fly ash for radioactive waste disposal could achieve the concept of disposal waste with waste and recycling, which could greatly contribute to the sustainable development of society..
52. Subbaiah Muthu Prabhu, Radheshyam Rama Pawar, Keiko Sasaki, Chang Min Park, A mechanistic investigation of highly stable nano ZrO 2 decorated nitrogen-rich azacytosine tethered graphene oxide-based dendrimer for the removal of arsenite from water, Chemical Engineering Journal, 10.1016/j.cej.2019.03.277, 1474-1484, 2019.08, [URL], We focused to synthesize graphene oxide-polyamidoamine dendrimer, up to 2nd generation, (GO-gen2) via a grafting method and the tethered groups were further covalently functionalized with a nitrogen-rich of an aromatic triazine ring of 5-azacytosine (Aza). Zirconia nanoparticles (ZrO 2 ) has been identified as promising material for removal of AsO 3 3− from water, however, its practical applicability is hindered due to its nanosize. Hence, ZrO 2 was successfully decorated through biomolecule assist on GO-gen2-Aza dendrimer. Various amounts of GO-gen2-Aza were used as stable supports to develop the nanocomposites with ZrO 2 . Then, the adsorption efficiency of highly toxic AsO 3 3− on developed composites was investigated for water treatment. The synthesized GO-dendrimer composites were characterized well before and after adsorption of AsO 3 3− using FTIR, PXRD, SEM, XPS, TGA, TEM and BET analysis. Particle size distribution of ZrO 2 revealed the peak top at 28 nm by zeta potential measurement. During synthesis, the GO sheets of composite were laminated by incorporation of ZrO 2 nanoparticles. The results of the batch experiments showed that ZrO 2 @2%GO-gen2-Aza dendrimer had higher adsorption density of AsO 3 3− than that of other developed forms of dendrimer composites. Langmuir equation well described the adsorption isotherm with the maximum adsorption capacity of 1.075 mmol/g. In addition, the enhanced AsO 3 3− adsorption density on ZrO 2 surface of ZrO 2 @x%GO-gen2-Aza, in which the GO-sheets were delaminated, resulting more ZrO 2 was dispersed homogeneously in the GO-sheets for maximum uptake of AsO 3 3− from water, confirmed by PXRD patterns. These results suggested that the developed GO-based dendrimer materials can be utilised for the practical remediation of toxic AsO 3 3− and other similar types of toxic ions, selenite, phosphate and fluoride from the contaminated water..
53. Quanzhi Tian, Keiko Sasaki, Characterizations of calcium silicate hydrates derived from coal fly ash and their mechanisms for phosphate removal, Desalination and Water Treatment, 10.5004/dwt.2019.24135, 156, 78-86, 2019.07, [URL], Coal fly ash is an industrial waste generated from the thermal power plant and a large amount of it could be produced annually in the world, which can cause serious environmental problems. Reutilization of coal fly ash could be imperative to alleviate the environmental pressure. Thus, in the present study, coal fly ash was used as silicon source for the synthesis of calcium silicate hydrates (C-S-Hs) though the desilication process. Two kinds of C-S-Hs was synthetized at 100°C and room temperature respectively, with the fixed Ca/Si molar ratio of 1.2, and adopted as the adsorbents for phosphate. The properties of them were characterized using XRD, SEM, FTIR, TG-DTA as well as surface area and pore analysis. Compared to C-S-H synthesized from high temperature, the C-S-H obtained at room temperature possessed high purity and larger surface area. Therefore, synthesis by agitation at room temperature could be an alternative method to produce C-S-H materials from desilication liquid of coal fly ash, and this could save infrastructure cost and energy consumption. Both C-S-H materials have good ability to immobilize phosphate pollutant (higher than 100 mg·g–1). The specific mechanisms of phosphate removal using C-S-H include several steps: Firstly, phosphate ion was immobilized by binding with Ca2+and forming aggregates, and the C-S-H structures were gradually corroded. Eventually, hydroxyapatite was formed after the C-S-H structure was totally destroyed..
54. Kojo T. Konadu, Robert J. Huddy, Susan T.L. Harrison, Kwadwo Osseo-Asare, Keiko Sasaki, Sequential pretreatment of double refractory gold ore (DRGO)with a thermophilic iron oxidizing archeaon and fungal crude enzymes, Minerals Engineering, 10.1016/j.mineng.2019.04.043, 138, 86-94, 2019.07, [URL], Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing, leading to a final gold recovery of 92%. These mineralogical alterations were confirmed by differential thermogravimetric analysis and quantitative evaluation of minerals with scanning electron microscopy. Based on the results, gold grains were mostly liberated after bio-oxidation of sulfides, and in following CFSM treatment, large particles of carbonaceous aluminosilicate were formed from the aggregation of clay minerals, gold grains and with partially decomposed carbonaceous matters acting as binders..
55. Quanzhi Tian, Keiko Sasaki, Characterizations of calcium silicate hydrates derived from coal fly ash and their mechanisms for phosphate removal, Desalination and Water Treatment, 10.5004/dwt.2019.24135, 156, 78-86, 2019.07, [URL], Coal fly ash is an industrial waste generated from the thermal power plant and a large amount of it could be produced annually in the world, which can cause serious environmental problems. Reutilization of coal fly ash could be imperative to alleviate the environmental pressure. Thus, in the present study, coal fly ash was used as silicon source for the synthesis of calcium silicate hydrates (C-S-Hs) though the desilication process. Two kinds of C-S-Hs was synthetized at 100°C and room temperature respectively, with the fixed Ca/Si molar ratio of 1.2, and adopted as the adsorbents for phosphate. The properties of them were characterized using XRD, SEM, FTIR, TG-DTA as well as surface area and pore analysis. Compared to C-S-H synthesized from high temperature, the C-S-H obtained at room temperature possessed high purity and larger surface area. Therefore, synthesis by agitation at room temperature could be an alternative method to produce C-S-H materials from desilication liquid of coal fly ash, and this could save infrastructure cost and energy consumption. Both C-S-H materials have good ability to immobilize phosphate pollutant (higher than 100 mg·g–1). The specific mechanisms of phosphate removal using C-S-H include several steps: Firstly, phosphate ion was immobilized by binding with Ca2+and forming aggregates, and the C-S-H structures were gradually corroded. Eventually, hydroxyapatite was formed after the C-S-H structure was totally destroyed..
56. Kojo T. Konadu, Robert J. Huddy, Susan T.L. Harrison, Kwadwo Osseo-Asare, Keiko Sasaki, Sequential pretreatment of double refractory gold ore (DRGO)with a thermophilic iron oxidizing archeaon and fungal crude enzymes, Minerals Engineering, 10.1016/j.mineng.2019.04.043, 138, 86-94, 2019.07, [URL], Double refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM)from white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing, leading to a final gold recovery of 92%. These mineralogical alterations were confirmed by differential thermogravimetric analysis and quantitative evaluation of minerals with scanning electron microscopy. Based on the results, gold grains were mostly liberated after bio-oxidation of sulfides, and in following CFSM treatment, large particles of carbonaceous aluminosilicate were formed from the aggregation of clay minerals, gold grains and with partially decomposed carbonaceous matters acting as binders..
57. Kojo T. Konadu, Susan Harrison, Kwadwo Osseo-Asare, Keiko Sasaki, Transformation of the carbonaceous matter in double refractory gold ore by crude lignin peroxidase released from the white-rot fungus, International Biodeterioration & Biodegradation, in press, 2019.06.
58. Quanzhi Tian, Shingo Nakama, Keiko Sasaki, Immobilization of cesium in fly ash-silica fume based geopolymers with different Si/Al molar ratio, Science of the Total Environment, 687, 1127-1137, 687 (2019)1127-1137, 2019.06.
59. Binglin Guo, Shingo Nakama, Quanzhi Tian, Niko Dian Pahlevi, Zhaochu Hu, Keiko Sasaki, Suppression processes of anionic pollutants released from fly ash by various Ca additives, Journal of Hazardous Materials, 10.1016/j.jhazmat.2019.03.036, 474-483, 2019.06, [URL], Harmful trace elements, which are initially included in the coal fly ash, have the potential to be leached when coal fly ash comes in contact with water. This causes a risk of pollutant species being released, considering the long lifetime of building structures where coal fly ash was applied. Some Ca additives effectively function to suppress the release of anionic pollutants; however, the detailed suppression processes remains unclear. In this work, the influences of various Ca additives on the released anionic pollutants (B, F, S, As, and Cr) was systematically investigated. According to the comprehensive results of solution data with the solid characterization, the 60% hydroxylated calcined dolomite (HCD 60) was the best Ca additive for the suppression of different anionic pollutants since this Ca source not only simply provides an alkaline reagent but also supplies MgO and Mg(OH) 2 , which affect the phase transformation that accompanies with hydration. The phase transformation occurs from Ca(OH) 2 to ettringite via hydrocalumite, which is the most important suppression processes of released pollutants. The precipitation of Ca salts is another pathway to immobilize these pollutants. In this scheme, MgO and Mg(OH) 2 were proven to enhance the formation of ettringite and hydrocalumite, respectively..
60. Paulmanickam Koilraj, Rajathsing Kalusulingam, Keiko Sasaki, Arginine and lysine-functionalized layered double hydroxides as efficient sorbents for radioactive Co2+ removal by chelate-facilitated immobilization, Chemical Engineering Journal, in press, 2019.05.
61. Subbaiah Muthu Prabhu, Srinivasarao Kancharla, Chang Min Park and Keiko Sasaki, Synthesis of modulator-driven highly stable zirconium-fumarate frameworks and mechanistic investigations of their arsenite and arsenate adsorption from aqueous solutions, RSC CrystEngComm, 10.1039/c8ce01424h, 21, 2320-2332, 2019.05, Here, we synthesized a modulator (benzoic acid (BA))-driven zirconium-fumaric acid (Zr-fum) metal–organic framework (MOF) and investigated in detail the adsorption mechanism of arsenic oxyanions (AsO43−and AsO33−) and their stability before and after adsorption from water. Without the support of the modulator, BA, Zr-fum formed an amorphous MOF due to the occurrence of quick precipitation of both zirconiumand -fum. Various amounts of BA, 0–10 eq. to ZrCl4, were used to control the surface charge on the MOF nanoparticles, which directly corresponds to the colloid stability of the MOF and helps to obtain a defect free
Zr-fum MOF for high uptakes of AsO43− and AsO33− from water. With the concentration of 3 eq. BA, the adsorption capacities of both arsenic oxyanions on the Zr-fum MOF were found to be higher than those on other MOFs. The CHN analysis indicated that the excess of -fum present does not alter the adsorption densities of AsO43− and AsO33− on MOFs in addition to the negligible amount of BA except for the Zr-fum-10 eq. BA MOF where it is present in higher amounts, as confirmed by NMR studies. The physicochemical properties of the synthesized MOFs with/without the modulator support adsorbents before and after the adsorption of AsO43− and AsO33− were extensively characterized using several advanced instrumental techniques. The maximum uptake performance of AsO43− (1.159 mmol g−1) and AsO33− (1.121 mmol g−1) was obtained using the Langmuir adsorption isotherm. The adsorption of both AsO4 3− and AsO3 3− takes place by electrostatic interaction/complexation and ligand exchange with Zr-fum-5 eq. BA. In addition, the Zr-fum-5 eq. BA was recycled up to four times at a sustained efficiency after washing with 0.1 M NaOH. Owing to their high uptake capacities of AsO4 3− and AsO3 3−, the synthesized MOFs are expected to have potential applications as adsorbents for practical applications..
62. Quanzhi Tian, Keiko Sasaki, Application of fly ash-based materials for stabilization/solidification
of cesium and strontium, Environmental Science and Pollution Research, https://doi.org/10.1007/s11356-019-05612-1, doi.org/10.1007/s11356-019-05612-1, 2019.05.
63. Xinhong Qiu, Keiko Sasaki, Shuang Xu, Jiawen Zhao, Double-Edged Effect of Humic Acid on Multiple Sorption Modes of Calcined Layered Double Hydroxides
Inhibition and Promotion, Langmuir, 10.1021/acs.langmuir.8b04196, 35, 19, 6267-6278, 2019.05, [URL], Layered double hydroxides (LDHs) are a typical class of anionic clay minerals whose structural memory effect has been widely used in pollutant adsorption. However, the influencing mechanism of humic acid (HA) on the structural memory effect in adsorption is not clear. In this study, HA was extracted from black soil and sediments, and its effect on the structural memory effect of LDHs with different divalent metals was evaluated in adsorption. Borate complexed with HAs and HAs promoted the dissolution of magnesium-calcined LDHs (Mg-CLDH), which enhanced their adsorption rate by Mg-CLDH. However, the adsorbed HA caused a decline in the crystallinity of the regenerated Mg-LDH and an incomplete structural transformation, thereby resulting in decreased adsorption capacity. After the complexation of HAs with borate, the resulting compound was adsorbed on the surface of Zn-CLDH. The adsorption rate of borate was effectively improved in the initial stage, but at the same time slowed down the hydration and structural regeneration of Zn-CLDH. Meanwhile, the surface-adsorbed HAs also prevented borate from entering the newly formed layer inside the particles and led to a significant decrease in adsorption performance. When Ca-CLDH was used to adsorb borate, the process mainly occurred through the formation of ettringite. However, the presence of HAs enhanced the stability of the restructured LDHs and hindered the dissolution of Ca-CLDH and the reaction with B(OH) 4 - to form ettringite during the regeneration process, which severely inhibited the sorption of borate..
64. Subbaiah Muthu Prabhu, Shunsuke Imamura, Keiko Sasaki, Mono-, Di-, and Tricarboxylic Acid Facilitated Lanthanum-Based Organic Frameworks
Insights into the Structural Stability and Mechanistic Approach for Superior Adsorption of Arsenate from Water, ACS Sustainable Chemistry and Engineering, 10.1021/acssuschemeng.8b06489, 7, 7, 6917-6928, 2019.04, [URL], In this study, we tried to synthesize lanthanum organic frameworks (MOFs) with the linkers of benzoic acid (BA), 1,4-benzene dicarboxylic acid, and 1,3,5-benzenetricarboxylic acid (BTC), abbreviated as La-BA, La-BDC, and La-BTC, respectively. Interestingly, the BA linker approached La metal to form lanthanum methanoate (La(HCOO)
3
) instead of the La-BA MOF through an acid catalyst amide-hydrolysis mechanism, whereas La-BDC and La-BTC act as MOFs, confirmed by PXRD patterns. Various sophisticated instrumentation techniques such as FTIR, PXRD, XPS, BET, and TGA were utilized to understand the formation of MOF. This is the first report to investigate AsO
4

3-
adsorption and the dissolution behavior of La-BA, La-BDC, and La-BTC in detail using different spectroscopic methods. The maximum AsO
4

3-
adsorption densities obtained from the Langmuir isotherm model were found to be 2.623, 3.891, and 0.280 mmol/g for La-BA, La-BDC, and La-BTC, respectively, where the dose ratio was 1 g/L with the speed of 100 rpm at room temperature. The value for La-BDC was significantly superior to the previously reported adsorbents for AsO
4

3-
to date. The presence of AsO
4

3-
on both La-BA and La-BDC was confirmed by FTIR and XPS As 3d. After adsorption of 2.4 mM AsO
4

3-
, the precipitation mechanism controls the adsorption capacities on La-BA and the ligand exchange mechanism on La-BDC confirmed by solution as well as solid analyses. Sorption kinetic data of AsO
4

3-
followed a pseudo-second-order model, which is consistent with chemisorption involving the possible coordination of AsO
4

3-
on La-BA and La-BDC. These results suggested that the MOF materials can be developed to immobilize arsenic-rich wastewater..
65. Kojo T. Konadu, Robert J. Huddy, Susan T. L. Harrison, Kwadwo Osseo-Asare, Keiko Sasaki, Bio-mineral processing of double refractory gold ore in sequential treatment using a thermophilic archaeon followed by fungal spent medium, Minerals Engineering, 138, 86-94, 2019.03.
66. Quanzhi Tian, Keiko Sasaki, Characterizations of Calcium Silicate Hydrates deprived from Coal Fly Ash and Their Mechanisms for Phosphate Removal, Desalination and Water Treatment, in press, 2019.03.
67. 林 良和、郭 柄霖、平島 剛、伊藤 竜也、中村 壮志、笹木 圭子, ハイドロキシアパタイト共沈法による坑廃水中のホウ酸およびヒ酸の同時除去のパイロット試験への応用, J. MMIJ, 印刷中, 2019.03.
68. Chitiphon Chuaicham, Radheshyam Pawar, Keiko Sasaki, Dye-sensitized photocatalyst of sepiolite for organic dye degradation, Catalysts, 10.3390/catal9030235, 9, 3, 2019.03, [URL], The photocatalytic activity of sepiolite was examined for degradation of several dye compounds under visible light irradiation. Higher adsorption capacities and greater photocatalytic performance of cationic dyes (rhodamine B and methylene blue) were observed on sepiolite, in comparison with anionic dyes (orange II and trypan blue). Superiority in the photocatalytic activity of cationic dyes is attributed to the strong electrostatic attraction and photosensitization properties of cationic dye molecules. Sepiolite has degraded 45.3% rhodamine B within 120 min, which is the greatest photocatalytic degradation efficiency when compared with other dyes. Subsequently, the reusability of spent sepiolite after adsorption of rhodamine B was evaluated by the degradation of trypan blue under the visible light irradiation. The photocatalytic degradation performance of trypan blue by spent sepiolite after adsorption of rhodamine B increased about twice as much as with pristine sepiolite, indicating that the dye-sensitized photocatalytic process could enhance the photocatalytic degradation ability of sepiolite. Through radical scavenger tests, it was found that a superoxide radical is mainly responsible for rhodamine B degradation. The possible mechanism of rhodamine B degradation under visible light irradiation was proposed. The sepiolite could be a potential catalyst for the degradation of organic pollutants in wastewater under solar light. View Full-Text.
69. Quanzhi Tian, Binglin Guo, Shingo Nakama, Li Zhang, Zhaochu Hu, Keiko Sasaki, Reduction of Undesirable Element Leaching from Fly Ash by adding Hydroxylated Calcined Dolomite, Waste Management, 10.1016/j.wasman.2019.01.027, in press, 2019.01.
70. Wuhui Luo, Qidong Huang, Binglin Guo, Keiko Sasaki, Organo-montmorillonite encapsulated in alginate for simultaneous adsorption of ClO4- and Sr2+ from aqueous solutions: Mechanism of synergistic effects and implication for radionuclide immobilization, Journal of Colloid and Interface Science, 2019.01.
71. Srinivasarao Kancharla, Keiko Sasaki, Acid tolerant covalently functionalized graphene oxide for the selective extraction of Pd from high-level radioactive liquid wastes, Journal of Materials Chemistry A, 10.1039/c8ta09849b, 7, 9, 4561-4573, 2019.01, [URL], The severely depleting reserves of highly demanded palladium (Pd) induce the growing pressure on its recycling. One of the potential secondary sources of Pd is a high-level liquid waste (HLLW) produced from spent nuclear fuel. HLLW contains several metal ions along with Pd in 3-4 M HNO
3
medium. The preparation of highly acid tolerant and efficient functional materials is a challenging task in the solid phase recovery of noble metals. We have explored covalently functionalized graphene oxide (GO) to overcome this issue. GO was covalently functionalized with 1-(3-aminopropyl)imidazole (ImGO) (N-donor) and 2-methylthiophene (ThpGO) (S-donor) through amide or amine formation at different reactive sites. The prepared materials before and after Pd recovery were thoroughly characterized using a variety of state-of-the-art techniques. Solid-phase extraction experiments revealed that the Pd was recovered with remarkable selectivity from HLLW-like solutions in 3 M HNO
3
using both the functionalized materials. The extraction efficiency was found to be higher than that of any of the solid-state materials reported to date. The sorption of Pd onto ImGO and ThpGO was best expressed by the Freundlich isotherm model. The advantages of the prepared materials are twofold: the first one is the high tolerance to harsh acidic conditions, and the second one is the higher selectivity and efficiency for Pd. The sorption of Pd onto ImGO was achieved by complete anion exchange with the nitrate ion, whereas ThpGO recovered Pd through a co-ordination mechanism. The results demonstrated that the developed covalently functionalized GO was the first choice material for the efficient and selective recovery of Pd..
72. Quanzhi Tian, Keiko Sasaki, Application of fly ash-based geopolymer for removal of cesium, strontium and arsenate from aqueous solutions
Kinetic, equilibrium and mechanism analysis, Water Science and Technology, 10.2166/wst.2019.209, 79, 11, 2116-2125, 2019.01, [URL], Geopolymerization is a developing reaction process for the utilization of solid wastes. In the present study, fly ash-based geopolymer and its derivative (Fe(II)-modified geopolymer) were synthesized and characterized using XRD, SEM, FTIR, BET, UV-Vis DRS as well as TG-DTA, and adopted as adsorbents for removal of Csþ and Sr, and AsO3 4 from solutions. Each sorption kinetic was well fitted to the pseudo-second-order model. The sorption of Csþ and Sr onto original geopolymer were better fitted to the Langmuir model. However, the Freundlich model is more befitting for sorption of AsO3 4 onto Fe(II)-modified geopolymer. The free energies calculated from the D-R isotherm indicated that the sorption for Csþ and Sr were dominantly ion exchanges. Ring size plays a decisive role in ion exchanges for both Csþ and Sr. Furthermore, the arrangement of SiO4 and AlO4 tetrahedrons has significant impacts on the ion exchange of Sr. XPS results indicated that a part of Fe in Fe (II)-modified geopolymer had been oxidized to Fe after sorption. Precipitation of FeAsO4 could partially contribute to the arsenate removal from solution. AsO3 4 sorption has also occurred through the formation of inner-sphere complexes via ion exchange reaction, which could be predominantly attached by bidentate linkages..
73. Santisak Kitjanukit, Keiko Sasaki, Naoko Okibe, Production of highly catalytic, archaeal Pd(0) bionanoparticles using Sulfolobus tokodaii, Extremophiles, 10.1007/s00792-019-01106-7, 2019.01, [URL], The thermo-acidophilic archaeon, Sulfolobus tokodaii, was utilized for the production of Pd(0) bionanoparticles from acidic Pd(II) solution. Use of active cells was essential to form well-dispersed Pd(0) nanoparticles located on the cell surface. The particle size could be manipulated by modifying the concentration of formate (as electron donor; e-donor) and by addition of enzymatic inhibitor (Cu2+) in the range of 14–63 nm mean size. Since robust Pd(II) reduction progressed in pre-grown S. tokodaii cells even in the presence of up to 500 mM Cl, it was possible to conversely utilize the effect of Cl to produce even finer and denser particles in the range of 8.7–15 nm mean size. This effect likely resulted from the increasing stability of anionic Pd(II)–chloride complex at elevated Cl concentrations, eventually allowing involvement of greater number of initial Pd(0) crystal nucleation sites (enzymatic sites). The catalytic activity [evaluated based on Cr(VI) reduction reaction] of Pd(0) bionanoparticles of varying particle size formed under different conditions were compared. The finest Pd(0) bionanoparticles obtained at 50 mM Cl (mean 8.7 nm; median 5.6 nm) exhibited the greatest specific Cr(VI) reduction rate, with four times higher catalytic activity compared to commercial Pd/C. The potential applicability of S. tokodaii cells in the recovery of highly catalytic Pd(0) nanoparticles from actual acidic chloride leachate was, thus, suggested..
74. Subbaiah Muthu Prabhu, Srinivasarao Kancharla, Chang Min Park, Keiko Sasaki, Synthesis of modulator-driven highly stable zirconium-fumarate frameworks and mechanistic investigations of their arsenite and arsenate adsorption from aqueous solutions, CrystEngComm, 10.1039/C8CE01424H, 21, 14, 2320-2332, 2019.01, [URL], Here, we synthesized a modulator (benzoic acid (BA))-driven zirconium-fumaric acid (Zr-fum) metal-organic framework (MOF) and investigated in detail the adsorption mechanism of arsenic oxyanions (AsO43− and AsO33−) and their stability before and after adsorption from water. Without the support of the modulator, BA, Zr-fum formed an amorphous MOF due to the occurrence of quick precipitation of both zirconium and -fum. Various amounts of BA, 0-10 eq. to ZrCl4, were used to control the surface charge on the MOF nanoparticles, which directly corresponds to the colloid stability of the MOF and helps to obtain a defect-free Zr-fum MOF for high uptakes of AsO43− and AsO33− from water. With the concentration of 3 eq. BA, the adsorption capacities of both arsenic oxyanions on the Zr-fum MOF were found to be higher than those on other MOFs. The CHN analysis indicated that the excess of -fum present does not alter the adsorption densities of AsO43− and AsO33− on MOFs in addition to the negligible amount of BA except for the Zr-fum-10 eq. BA MOF where it is present in higher amounts, as confirmed by NMR studies. The physicochemical properties of the synthesized MOFs with/without the modulator support adsorbents before and after the adsorption of AsO43− and AsO33− were extensively characterized using several advanced instrumental techniques. The maximum uptake performance of AsO43− (1.159 mmol g−1) and AsO33− (1.121 mmol g−1) was obtained using the Langmuir adsorption isotherm. The adsorption of both AsO43− and AsO33− takes place by electrostatic interaction/complexation and ligand exchange with Zr-fum-5 eq. BA. In addition, the Zr-fum-5 eq. BA was recycled up to four times at a sustained efficiency after washing with 0.1 M NaOH. Owing to their high uptake capacities of AsO43− and AsO33−, the synthesized MOFs are expected to have potential applications as adsorbents for practical applications..
75. Quanzhi Tian, Keiko Sasaki, Structural characterizations of fly ash-based geopolymer after adsorption of various metal ions, Environmental Technology (United Kingdom), 10.1080/09593330.2019.1649469, 2019.01, [URL], Geopolymer, an amorphous substance, has been viewed as good adsorbent or catalyst and attracted much attentions from all over the world. In order to achieve the better applications of geopolymer in these fields, a deep understanding of the microstructure of geopolymer would be strongly required. In the present study, geopolymer was synthesized from coal fly ash, and the structural analysis of geopolymer after adsorption of various metal ions (Li+, Cs+, Sr2+ and Co2+) was studied using XRD, SEM-EDX, FTIR, UV-VIS DRS, TG-DTA as well as surface area and pore distribution analysis. Pair distribution function preferably illustrated that geopolymer was successfully prepared from calcined fly ash. Geopolymer possesses different affinities towards various metal ions. After exchanging with other metal ions, the main structure of geopolymer was maintained. Metal ions with a large radius would have greater effect on the existing state and amount of water molecules in geopolymer. Moreover, the specific surface area of geopolymer after exchanging with metal ions decreased as a function of the radius of them. The spectra corresponding to d-d transitions indicated that the Co2+ could be incorporated into the deformed six-member rings or eight-membered rings. It could be deduced that the sites for ion exchange could be different rings or even cavities distributed on the surface layer of geopolymer. Furthermore, the rings distributed in the geopolymer structure were predominant in the 6-, 8-, 10- or even 12-member rings to maintain the structure stability and charge balance with the cations..
76. Shuang Xu, Jiawen Zhao, Qianqian Yu, Xinhong Qiu, Keiko Sasaki, Understanding how specific functional groups in humic acid affect the sorption mechanisms of different calcinated layered double hydroxides, Chemical Engineering Journal, 10.1016/j.cej.2019.123633, 392, 2019.01, [URL], Humic acid (HA) can affect the adsorption modes of CLDHs, and change the form of pollutants, making it a key factor when considering CLDHs for practical applications. However, the complicated and uncertain structures of HA make it difficult to explore how they will influence the mechanism, so using simple compounds to simulate the role of different reactive groups in HA necessary to understand how they will interact with the application of CLDHs. It was found that both CLDHs strongly adsorb phthalic acid and catechol. All hydroxyl and carboxyl compounds had a similar promoting effect on the adsorption rate and regeneration rate of Mg-CLDH, which were not affected by the number of functional groups, the length of the aliphatic chain, or the number of the aromatic ring. However, their effects were more significant than that of the HA. While they could make the structure of Mg-LDH stacked and incomplete, just like the HA, they did not damage the crystallinity. In particular, catechol inhibited the regeneration of Mg-CLDH to a certain degree. Since the regeneration process was different from Mg-CLDH, different types of hydroxyl or carboxyl compounds degraded the removal of borate by Ca-CLDH, but promoted the formation of ettringite to some extent, especially benzoic acid and 4-phenylbutyric acid. However, catechol severely inhibited the structural transformation of Ca-CLDH into ettringite. Due to the strong interaction of the HA with the surface of Ca-LDH, the formation of ettringite was hindered, which deteriorated the removal of borate. HA did change the adsorption rate and the regeneration process of CLDHs via different reactive groups, and their effects on various CLDHs were different..
77. Kancharla Srinivasarao, Keiko Sasaki, Acid tolerant covalently functionalized graphene oxide for the selective extraction of Pd from high-level radioactive liquid wastes, Journal of Material Chemistry A, in press, 2018.12, The severely depleting reserves of highly demanded palladium (Pd) induce the growing pressure on its recycling. One of the potential secondary sources of Pd is a high-level liquid waste (HLLW) produced
from spent nuclear fuel. HLLW contains several metal ions along with Pd in 3–4 M HNO3 medium. The preparation of highly acid tolerant and efficient functional materials is a challenging task in the solid
phase recovery of noble metals. We have explored covalently functionalized graphene oxide (GO) to overcome this issue. GO was covalently functionalized with 1-(3-aminopropyl)imidazole (ImGO) (Ndonor)
and 2-methylthiophene (ThpGO) (S-donor) through amide or amine formation at different reactive sites. The prepared materials before and after Pd recovery were thoroughly characterized using a variety of state-of-the-art techniques. Solid-phase extraction experiments revealed that the Pd was recovered with remarkable selectivity from HLLW-like solutions in 3 M HNO3 using both the functionalized materials. The extraction efficiency was found to be higher than that of any of the solidstate materials reported to date. The sorption of Pd onto ImGO and ThpGO was best expressed by the Freundlich isotherm model. The advantages of the prepared materials are twofold: the first one is the
high tolerance to harsh acidic conditions, and the second one is the higher selectivity and efficiency for Pd. The sorption of Pd onto ImGO was achieved by complete anion exchange with the nitrate ion,
whereas ThpGO recovered Pd through a co-ordination mechanism. The results demonstrated that the developed covalently functionalized GO was the first choice material for the efficient and selective recovery of Pd..
78. Chitiphon Chuaicham, Radhesham Pawar, Keiko Sasaki, Dye-sensitized Photocatalyst of Sepiolite for Organic Dye Degradation, Catalysts, 9(2019) 235-251, 2018.12.
79. Subbaiah Muthu Prabhu, Shunsuke Imamura, Keiko Sasaki*, Mono-, di- and tri-carboxylic acid facilitated lanthanum-based organic frameworks: Insights into the structural stability and mechanistic approach for superior adsorption of arsenate from water, ACS Sustainable Chemistry and Engineering, in press, 2018.12, In this study, we synthesized three metal organic frameworks (MOFs) of La, with benzoic acid (BA), 1,4-benzene dicarboxylic acid (BDC) and 1,3,5-benzenetricarboxylic acid (BTC), abbreviated as La-BA, La-BDC and La-BTC, respectively. Interestingly, the BA ligand approached La metal to form lanthanum methanoate (La(HCOO)3 instead of the La-BA MOF through an acid catalyst amide-hydrolysis mechanism, whereas La-BDC and La-BTC act as MOFs, confirmed by PXRD patterns. The mechanism of MOF formation was revealed through PXRD, FT-IR, XPS and ICP-OES analyses. This is the first report to investigate AsO43- adsorption and the dissolution behavior of La-BA, La-BDC and La-BTC in detail using different spectroscopic methods. The maximum adsorption capacities of AsO43- obtained from the Langmuir isotherm model were found to be 2.623, 3.891 and 0.280 mmol/g for La-BA, La-BDC and La-BTC, respectively, where the the dose ratio of 1 g/L with the speed of 100 rpm at room temperature. The value for La-BDC was significantly superior to the previously reported adsorbents for AsO43- to date. The presence of AsO43- on both La-BA and La-BDC was confirmed by FTIR and XPS As 3d. The PXRD patterns confirmed the formation of LaAsO4 by the precipitation mechanism after adsorption of 2.4 mM AsO43- on both La-BA and La-BDC. Sorption kinetic data of AsO43- followed a pseudo-second-order model, which is consistent with chemisorption involving the possible coordination of AsO43- on La-BA and La-BDC. These results suggested that the MOF materials can be developed for the immobilization of AsO43- from waste water..
80. Santisak Kitjanukit; Keiko Sasaki; Naoko Okibe, Production of highly-catalytic, archaeal Pd(0) bionanoparticles using Sulfolobus tokodaii, Extremophile, in press., 2018.12.
81. Paulmanickam Koilraj, Yuta Kamura, Keiko Sasaki, Cosorption Characteristics of SeO4 2- and Sr2+ Radioactive Surrogates Using 2D/2D Graphene Oxide-Layered Double Hydroxide Nanocomposites, ACS Sustainable Chemistry and Engineering, 10.1021/acssuschemeng.8b02056, 6, 11, 13854-13866, 2018.11, [URL], Cosorption of anionic and cationic radioactive nuclides is highly desired toward the total cleaning of radioactive contaminated wastewater. A 2D/2D multifunctional nanocomposite of MgAl-LDH/graphene oxide (GO) was fabricated using coagulation and applied for the cosorption of Sr2+ and SeO4 2- from aqueous solution. The cosorption was synergetically enhanced with the copresence of each species and showed a maximum Sr2+ removal of 2.435 mmol/g of GO. The synergetic effect occurs only in the MgAl-LDH/GO nanocomposite because of the synchronized effect of MgAl-LDH, GO, and alkaline cations, which were not present in pure GO. The SeO4 2- removal occurred by the interchange of the NO3 - anion from the LDH, while the removal of Sr2+ occurred through coordination with carboxyl/alkoxy (âCOO-/-CO-) groups in GO by the ring opening of epoxides. The cosorption efficiencies of Sr2+ and SeO4 2- were stable in the wide pH range of 4-10. The binary (Na2SeO4 + SrCl2) and ternary (Na2SeO4 + SrCl2 + M+/M2+ = other metal ions or An- = other negative ions) systems enhanced the cosorption of Sr2+ and SeO4 2- in the presence of other alkali and alkali earth metals and other anions compared with the single system. The Sr2+ and SeO4 2- sorption densities were superior to previously reported values. The combined multifunctional ability and environmentally benign nature of the MgAl-LDH/GO composite is promising as a sustainable material for the total remediation of Sr2+ and SeO4 2- radioactive surrogates and can also be extended to wide combinations of divalent anions and cations..
82. Quanzhi Tian, Binglin Guo, Shingo Nakama, Keiko Sasaki, Distributions and Leaching Behaviors of Toxic Elements in Fly Ash, ACS Omega, 10.1021/acsomega.8b02096, 3, 10, 13055-13064, 2018.10, [URL], Fly ash usually contains a considerable amount of toxic elements that can be leached into the environment, thereby easily leading to serious contaminations. In this work, the leaching behaviors of poisonous elements including boron (B), phosphorus (P), vanadium (V), chromium (Cr), arsenic (As), selenium (Se), molybdenum (Mo), antimony (Sb), and tungsten (W) from fly ash were explored by sequential extraction. Importantly, the associations of these elements in fly ash were discussed based on their leaching and X-ray absorption near-edge structure (XANES) results. From the XANES results, it was observed that V(IV), Cr(III), As(V), Se(IV), and W(IV) were their main states of existence in fly ash. In terms of leaching results, large amounts of Mo and W were leached into pure water, which indicated their high mobilities. Furthermore, the occurrence of Mo in fly ash was mainly in the form of oxides, and W had complex associations including WX
4
(X can be monovalent anions), its reduction state or association with the elements that can be oxidized, and existence in silicates. B was as easily released into the environment as Mo and W. It can have several associations with the other cations, such as Ca
2+
, Na
+
, and Mg
2+
, and occurs in silicates. In contrast, most of the Cr and Sb were locked in silicates, indicating that they were very stable in fly ash. In addition, P, V, and As can exist within the structure of silicates as well. However, a considerable amount of them leached in the reduction step with a low pH. Hence, they can be associated with Ca
2+
, Na
+
, Mg
2+
, or Fe
3+
. In terms of Se, oxidation processes played an important role in controlling its leaching because of the oxidation of Se(IV) to Se(VI). Calcium selenite should be the predominant form of Se in fly ash..
83. Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi, Effect of Fenton-like oxidation reagent on hydrophobicity and floatability of chalcopyrite and molybdenite, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/j.colsurfa.2018.06.029, 554, 34-48, 2018.10, [URL], A fundamental study is provided in this work to understand the effect of Fenton-like reagent made by the addition of FeSO4 in H2O2 aqueous solution on surface hydrophobicity and floatability of chalcopyrite (CuFeS2) and molybdenite (MoS2). Contact angle measurements were performed to assess the surface hydrophobicity. The contact angle results showed that Fenton-like reagent could alter the surface hydrophobicity of chalcopyrite at lower concentration of H2O2 aqueous solution compared to that of using H2O2 aqueous solution. On the other hand, molybdenite surface remained hydrophobic after the oxidation treatments using Fenton-like reagent and H2O2 aqueous solution. Surface characterizations using atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) shows that the chalcopyrite surface covered with a thicker layer of oxidation products after the oxidation treatment using Fenton-like reagent, indicating a stronger surface oxidation. Flotation results were in agreement with contact angle results, showing that Fenton-like reagent could depress the floatability of chalcopyrite at lower concentration of H2O2 aqueous solution. On the other hand, molybdenite recovery remained high under various oxidation treatments owing to low surface oxidation..
84. Kancharla Srinivasarao, Subbaiah Muthu Prabhu, Wuhui Luo, Keiko Sasaki, Enhanced adsorption of perchlorate by gemini surfactant-modified montmorillonite
Synthesis, characterization and their adsorption mechanism, Applied Clay Science, 10.1016/j.clay.2018.07.010, 163, 46-55, 2018.10, [URL], Organo-montmorillonites (OMt) adsorb perchlorate (ClO4 ) through anion exchange mechanism. Each gemini surfactant (GCn) provides two anion exchangeable sites due to its unique molecular structure. Due to the presence of more anion exchangeable sites, the preparation of OMt with GCn enables the possibility for higher amount of ClO4 uptake than their single-chain counterparts. In this work, gemini surfactant modified montmorillonites (GCn-Mt) were synthesized using three different alkyl chain length containing gemini surfactants (CnH2n+1(Me)2-C6H12-CnH2n+1(Me)2·2Cl), where n varied to 12, 14 and 16 and were examined in detail for the adsorption of ClO4 from aqueous solution. The structure of the GCn-Mt before and after adsorption of ClO4 was characterized by an array of techniques such as powder XRD, FT-IR, XPS, TGA and CHN analysis. The adsorption of ClO4 onto the GCn-Mt was best described by the Langmuir adsorption isotherm and pseudo-second-order kinetic model. The GC16-Mt showed the highest removal capacity of 1.08 mmol/g and at a rapid rate, achieving 95% within 1 min, with an equilibrium time of 15 mins. The GC16-Mt retained its high removal capacity and selectivity in presence of a variety of coexisting anions such as HCO3 , NO3 , CO3 2−, SO4 2−, SiO3 2−, and H2PO4 , and at a wide pH range (2−12). Combining the high removal capacity and selectivity with fast kinetics, the GCn-Mt has great potential for ClO4 removal from aqueous solutions..
85. Paulmanickam Koilraj, Yuta Kamura, Keiko Sasaki, Co-immobilization characteristics of SeO42- and Sr2+ radioactive surrogates using 2D/2D graphene oxide-layered double hydroxide nanocomposites, ACS Sustainable Chemistry in Engineering, 2018.09.
86. Subbaiah Muthu Prabhu, Kancharla Srinivasarao, Keiko Sasaki, Synthesis of modulator-driven highly stable zirconium-fumarate frameworks and their mechanistic investigations for the adsorption of arsenite and arsenate from aqueous solutions, RSC Cryst Eng Comm, in press, 2018.09.
87. Quanzhi Tian, Binglin Guo, Shingo Nakama, Keiko Sasaki, Distributions and Leaching Behaviors of Toxic Elements in Fly Ash, ACS Omega, 2018.09.
88. Binglin Guo, Shingo Nakama, Quanzhi Tian, Niko Dian Pahlevi, Li Zhang, Zhaochu Hu, Keiko Sasaki, Suppression mechanisms of anionic pollutants released from fly ash by different Ca additives, J. Hazard. Mater., 371(2019)474-483, 2018.09.
89. Masahito Tanaka, Keiko Sasaki, Naoko Okibe, Behavior of sulfate ions during biogenic scorodite crystallization from dilute As(III)-bearing acidic waters, Hydrometallurgy, 10.1016/j.hydromet.2018.07.018, 180, 144-152, 2018.09, [URL], This study revealed the importance of SO4
2− ions during biogenic scorodite crystallization via a two-stage As-removal process, using a combination of liquid and solid analyses (chemical digestion, FT-IR, SEM, TG-DTA, particle distribution). The first-stage As-removal was induced by microbial oxidation of Fe2+ and As(III), precipitating SO4
2−-bearing amorphous precursors composed of basic ferric sulfate (MFex(SO4)y(OH)z) and ferric arsenate (FeAsO4·(2 + n)H2O). This was followed by an induction period (a period of constant concentration), where dissolution-recrystallization of unstable amorphous precursors proceeded: Re-dissolved metal ions became locally concentrated on the surface of precursors, which gave the driving force for the second-stage As-removal as secondary layers of crystalline biogenic scorodite (Fe(AsO4)0.94(SO4)0.08·1.69H2O) out of even more dilute and seeded solution. This phase transformation process was also accompanied by continuous dehydration. This two-stage As-removal via SO4
2−-mediated phase transformation was shown to be key to promote biogenic scorodite formation with greater final As-removal from dilute As(III)-bearing solutions..
90. Keiko Sasaki, Yoshikazu Hayashi, Kenta Toshiyuki, Binglin Guo, Simultaneous immobilization of borate, arsenate, and silicate from geothermal water derived from mining activity by co-precipitation with hydroxyapatite, Chemosphere, 10.1016/j.chemosphere.2018.05.074, 207, 139-146, 2018.09, [URL], The treatment of the geothermal water discharged through mining activity is a critical issue because the rate of discharge is 12,000 m3 per day and the discharge contains high concentrations of borate (>20 mg/L) and arsenate (ca. 0.4 mg/L) as well as silicate and carbonate. The simultaneous reduction of borate and arsenate concentrations to acceptable levels was successfully performed by co-precipitation with hydroxyapatite (HAp). Although the coexisting high concentrations of carbonate act as a disturbing element, the co-precipitation equilibrium of borate was shifted to lower values by adjusting the P/Ca molar ratio, and the removal rate of borate was accelerated by using Al3+ additives, resulting in the efficient reduction of borate within 1 h. The initially immobilized boron in HAp is in the tetragonal form, which probably occupies the hydroxyl sites in HAp, gradually transforming into the trigonal form in the solid state, as interpreted by 1H NMR and 11B-NMR. The coexisting silicate was also immobilized in an ellestadite form, as confirmed by 29Si-NMR measurements. Arsenate and silicate were immobilized before borate in geothermal water. A dissolution assay of borate in the solid residues after co-precipitation with HAp verified the acceptable stability of borate, which is independent of the amount of added Al3+..
91. Kancharla Srinivasarao, Subbaiah Muthu Prabhu, Wuhui Luo, Keiko Sasaki, Enhanced adsorption of perchlorate by gemini surfactant-modified montmorillonite: Synthesis, characterization and their adsorption mechanism, Applied Clay Science, org/10.1016/j.clay.2018.07.010, 163, 46-55, 2018.07.
92. Keiko Sasaki, Yoshikazu Hayashi, Kenta Toshiyuki, Binglin Guo, Simultaneous immobilization of borate, arsenate, and silicate from geothermal water derived from mining activity by co-precipitation with hydroxyapatite, Chemosphere, 207, 139-146, 2018.06, The treatment of the geothermal water discharged through mining activity is a critical issue because the rate of discharge is 12,000m3 per day and the discharge contains high concentrations of borate (>20 mg/ L) and arsenate (ca. 0.4 mg/L) as well as silicate and carbonate. The simultaneous reduction of borate and arsenate concentrations to acceptable levels was successfully performed by co-precipitation with hydroxyapatite element, the co-precipitation equilibrium of borate was shifted to lower values by adjusting the P/Ca molar ratio, and the removal rate of borate was accelerated by using Al3þ additives, resulting in the efficient reduction of borate within 1 h. The initially immobilized boron in HAp is in the tetragonal form, which probably occupies the hydroxyl sites in HAp, gradually transforming into the trigonal form in the solid state, as interpreted by 1H NMR and 11B-NMR. The coexisting silicate was also immobilized in an
ellestadite form, as confirmed by 29Si-NMR measurements. Arsenate and silicate were immobilized before borate in geothermal water. A dissolution assay of borate in the solid residues after coprecipitation with HAp verified the acceptable stability of borate, which is independent of the amount of added Al3+..
93. Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Effect of Fenton-like oxidation reagent on hydrophobicity and floatability of chalcopyrite and molybdenite, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 554, 34-48, 2018.06.
94. Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Keiko Sasaki, Masashi Yamane, Eri Takida, Shigeto Kuroiwa, Yuji Imaizumi, Selective flotation of chalcopyrite and molybdenite using H2O2 oxidation method with the addition of ferrous sulfate, Minerals Engineering, 10.1016/j.mineng.2018.02.005, 122, 312-326, 2018.06, [URL], Hydrogen peroxide (H2O2) has been used as an oxidizing agent in the selective flotation of chalcopyrite and molybdenite. However, this method required relatively high concentration of H2O2 to deliver flotation results (i.e., mineral grades and recoveries) comparable to those obtained by the conventional copper-molybdenum (Cu-Mo) ores flotation using sodium hydrosulfide (NaHS). Therefore, further improvements are needed to reduce the consumption of H2O2 reagent. In this study, ferrous sulfate (FeSO4) was used to enhance the oxidation performance of H2O2 through Fenton-like reactions. Flotation results showed that the consumption of H2O2 reagent could be reduced by the addition of FeSO4 without losing the flotation selectivity. The reason might be caused by increasing of oxidation performance as indicated by the increasing concentration of dissolved oxygen after the addition of FeSO4 into the H2O2 aqueous solution. Surface analysis using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) images showed that the surface of chalcopyrite was covered by more hydrophilic precipitates after the oxidation treatment using H2O2 aqueous solution with the addition of FeSO4, thus more hydrophilic surface and lower floatability. On the other hand, the surface of molybdenite was slightly oxidized and its surface remained hydrophobic as confirmed from contact angle results. Flotation tests using Cu-Mo bulk concentrate demonstrated that selective flotation might be possible using a mixture of FeSO4 and H2O2 aqueous solution. Moreover, this new method could be used as an alternative to copper depressant in Cu-Mo selective flotation, replacing the NaHS reagent..
95. Paulmanickam Koilraj, Yuta Kamura, Keiko Sasaki, Synergetic co-immobilization of SeO42- and Sr2+ from aqueous solution onto graphene oxide and carbon-dot based layered double hydroxide nanocomposites and their mechanistic investigation, RSC J. Material Chemistry A, 10.1039/C8TA01605D, 6, 10008-10018, 2018.05, The co-immobilization of radioactive Sr2+ and SeO42- using a multifunctional material is an interesting area of research for the total remediation of radioactive wastes. However, it is rather challenging to target both the anion and cation through the realization of a multifunctional ability of the resultant sorbent. In this work, MgAl–NO3-layered double hydroxides (LDHs) containing graphene oxide (GO) and carbon dot (C-dot) nanocomposites were synthesized and contrasted for the co-immobilization of Sr2+ and SeO42-. Zeta potential measurements and TEM observation of the MgAl–NO3-LDH/C-dot composite indicated that the carbon-nanodot was attached to the surface of LDH nanosheets, while in the MgAl–NO3-LDH/GO composites the LDH nanosheets were decorated on the larger sized GO nanosheets. Adsorption studies found that the normalized Sr2+ adsorption capacity was 1.793 mmol g-1 on MgAl–NO3-LDH/GO, which was nine times higher than that for the MgAl–NO3-LDH/C-dot composite and GO. The enhancement in the Sr2+ adsorption capacity is due to the co-operative effect of the LDH and GO. The adsorption of Sr2+ on the MgAl–NO3-LDH/C-dot occurs by coordination with the –COO group, while ligand exchange and ionic interaction with the alkoxide anion are the dominant mechanisms on the MgAl–NO3-LDH/GO composite. Moreover, the adsorption capacity of both Sr2+ and SeO42- increased synergistically in the bi-component system containing both ions. The present technique is promising and offers a sustainable and environmentally friendly multifunctional material for the co-immobilization of both anionic and cationic radioactive surrogates from aqueous solutions..
96. Hajime Miki, Tsuyoshi Hirajima, Yukihiro Muta, Gde Pandhe Wisnu Suyantara, Keiko Sasaki, Effect of sodium sulfite on floatability of chalcopyrite and molybdenite, Minerals, 10.3390/min8040172, 2018.05.
97. Zhisheng Gao, Keiko Sasaki, Xinhong Qiu, Structural memory effect of Mg-Al and Zn-Al layered doubled hydroxides in the presence of natural humic acid, Langmuir, 10.1021/acs.langmuir.8b00059, 34, 5386-5395, 2018.05, The structural memory effect of layered double hydroxides (LDHs) is one of the important reasons for their extensive use in environmental remediation. In this study, humic acid (HA) was extracted from black soil and sediments and characterized to determine their structures. The regeneration mechanisms of calcinated LDHs (CLDHs) including different divalent metals (Mg-CLDH and Zn-CLDH) in deionized water and different HA solutions were carefully elucidated, and the reasons for the behavior differences in the two materials were explained. The presence of the HAs significantly increased the dissolution rate of Mg2+ ions from Mg-CLDHs and subsequent regeneration of Mg-LDH. Because of the diverse functional groups in the HAs, these groupswere complexed with metallic ions such as Mg2+ on the surface of Mg- CLDH in the beginning. During the process, the HAs adsorbed the regenerated LDHs on the surfaces. Therefore, the crystallinity, morphology, and specific surface area of the regenerated Mg-LDH significantly changed, especially in the presence of high concentrations of HA. In the case of Zn-CLDH, the regeneration rate of the LDH increased in the presence of HA, but the surface of Zn-CLDH was covered with regenerated Zn-LDH and HA. Then, the inside of the particles could not transform to LDH, leading to poor crystallinity and a significant increase in the ZnO content of the HA system..
98. Subbaiah Muthu Prabhu, Chitiphon Chuaicham, Keiko Sasaki, A Mechanistic Approach for the Synthesis of Carboxylate-Rich Carbonaceous Biomass-Doped Lanthanum-Oxalate Nanocomplex for Arsenate Adsorption, ACS Sustainable Chemistry and Engineering, 10.1021/acssuschemeng.7b04678, 6, 5, 6052-6063, 2018.05, [URL], Considering the protocol of "zero-alkaline waste disposal" for green and arsenic-free environment, lanthanum (La3+)-based MOF-like complex materials were designed, and the complex materials have been employed as adsorbent for AsO4
3- adsorption from water. The sucrose-derived porous carbon (SPC)@La-oxalate complex was prepared by a simple one-pot coprecipitation method at room temperature, where oxalate has been used as an organic ligand, and the carbonaceous biomass has been used as a doping material that is naturally a carboxylate-rich functional group derived from a sucrose biomass. In addition to SPC@La-oxalate, bare-SPC, La(OH)3, and SPC@La(OH)3 were also prepared via simple base-addition conventional methods, and their performances in AsO4
3- removal were compared. The FTIR peak at 848 cm-1 confirmed the presence of AsO4
3- on the SPC@La-oxalate complex after adsorption of 1 mM AsO4
3-. The high resolution X-ray photoelectron spectrum for the AsO4
3- adsorbed SPC@La-oxalate showed a peak at EB[As 3d] = 45.2 eV, which could be attributed to As5+. The EXAFS of the As K-edge revealed that there are two distinct atomic shells, As-O with the distance of 1.68 Å and As-La with the distance of 3.32 Å, indicating the formation of monodentate complex of La with AsO4
3-. Additionally, an electrostatic interaction and hydrogen bonding are also possible adsorption mechanism in acidic conditions. The SPC@La-oxalate complex adsorbent showed excellent dearsenate behavior of 1.093 mmol/g, and the maximum AsO4
3- removal was maintained in a wide pH range from 3 to 8. Sorption kinetic data were the best expressed by a pseudo-second-order rate equation, and the maximum adsorption capacity was 1.858 mmol/g based on Langmuir monolayer adsorption. Compared with previous reports, SPC@La-oxalate adsorbent could be easily prepared, and the uptake amounts for AsO4
3- were enriched. Reusability of the material after six cycles is yet another advantage to the present adsorbent. This work will help to facilitate the research on novel complex adsorbents for the removal of AsO4
3- from water..
99. Niko Dian Pahlevi, Binglin Guo, Keiko Sasaki, Immobilization of selenate in cancrinite using a hydrothermal method, Ceramics International, 10.1016/j.ceramint.2018.02.083, 44, 7, 8635-8642, 2018.05, [URL], Because of the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, radioactive species were leaked out, including selenium isotopes (79Se). Developing a stable matrix that is suitable for longterm storage is necessary for the decommissioning process of the FDNPP. In the present work, the co-precipitation of SeO4 2− in cancrinite/sodalite as a potential stable matrix was investigated at various reaction times using a hydrothermal method. Over time, the SeO4 2− contents in the solid products gradually increased. The XRD patterns revealed that the reaction produced multi-phased precipitates, which were zeolite Na (P), sodalite, and cancrinite. As the SeO4 2− amount increased, the solid products were transformed to cancrinite. The calculated lattice parameter of sodalite and cancrinite showed an increase in lattice parameter a for sodalite and cancrinite, suggesting SeO4 2− incorporated into the sodalite/cancrinite structure. XRD, SEM, FTIR, 27Al-NMR, and 29Si-NMR results revealed the phase transformation of the solid products over time. Four stages of the co-precipitation mechanism are proposed, including the formation of zeolite P (Na), hydroxylation of zeolite P (Na), the formation of sodalite, and cancrinite reprecipitation..
100. Yusei Masaki, Tsuyoshi Hirajima, Keiko Sasaki, Hajime Miki, Naoko Okibe, Microbiological Redox Potential Control to Improve the Efficiency of Chalcopyrite Bioleaching , Geomicrobiol. J., 10.1080/01490451.2018.1443170, 2018.03.
101. Subbaiah Muthu Prabhu, Chitiphon Chuaicham, Keiko Sasaki, A Mechanistic Approach for the Synthesis of Carboxylate-Rich Carbonaceous Biomass-Doped Lanthanum-Oxalate Nanocomplex for Arsenate Adsorption, ACS Sustainable Chemistry & Engineering, doi/10.1021/acssuschemeng.7b04678, 6, 6052-6063, 2018.03.
102. Masahito Tanaka, Naoko Okibe, Keiko Sasaki, Factors to Enable Crystallization of Environmentally Stable Bioscorodite from Dilute As(III)-Contaminated Waters., Minerals, 2018, 8, 23., 10.3390/min8010023, 2018.03.
103. Wuhui Luo, Keiko Sasaki, Tsuyoshi Hirajima, Influence of the pre-dispersion of montmorillonite on organic modification and the adsorption of perchlorate and methyl red anions, Applied Clay Science, 10.1016/j.clay.2017.12.032, 154, 1-9, 2018.03, [URL].
104. Keiko Sasaki, Kenta Toshiyuki, Binglin Guo, Keiko Ideta, Yoshikazu Hayashi, Tsuyoshi Hirajima, Jin Miyawaki, Calcination effect of borate-bearing hydroxyapatite on the mobility of borate, Journal of Hazardous Materials, 10.1016/j.jhazmat.2017.10.003, 344, 90-97, 2018.02, [URL].
105. Niko Dian Pahlevi, Binglin Guo, Keiko Sasaki, Immobilization mechanism of selenate in cancrinite by hydrothermal method, Ceramic International, 2018.01.
106. Gde Pandhe Wisnu SUYANTARA, Tsuyoshi HIRAJIMA, Hajime MIKI, Keiko SASAKI, Floatability of molybdenite and chalcopyrite in artificial seawater, Minerals Engineering, 10.1016/j.mineng.2017.10.004, 115, 117-130, 2018.01, [URL].
107. Subbaiah Muthu Prabhu, Shunsuke Imamura, Keiko Sasaki, Mono-, di- and tri-carboxylic acid mediated lanthanum based organic frameworks: Insights into the mechanistic approach for superior adsorption of arsenate from water, ACS Sustainable Chemistry in Engineering, 2018.01.
108. Paulmanickam Koilraj and Keiko Sasaki, Eco-Friendly Alkali-Free Arginine-Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency, Chemistry Select, 10.1002/slct.201702134, Vol. 2, Issue 32, 10459-10469, 2017.11.
109. Binglin Guo, Keiko Sasaki, Tsuyoshi Hirajima, Solidification of ettringite after uptaking selenate as a surrogate of radionuclide in glass-ceramics by using industrial by-products, Journal of Materials Science, 10.1007/s10853-017-1422-x, 52, 22, 12999-13011, 2017.11, [URL].
110. Paulmanickam Koilraj, Yuta Kamura, Keiko Sasaki, Carbon-Dot-Decorated Layered Double Hydroxide Nanocomposites as a Multifunctional Environmental Material for Co-immobilization of SeO4 2- and Sr2+ from Aqueous Solutions, ACS Sustainable Chemistry and Engineering, 10.1021/acssuschemeng.7b01979, 5, 10, 9053-9064, 2017.10, [URL].
111. Qianqian Yu, Toshihiko Ohnuki, Naofumi Kozai, Fuminori Sakamoto, Kazuya Tanaka, Keiko Sasaki, Quantitative analysis of radiocesium retention onto birnessite and todorokite, Chemical Geology, 10.1016/j.chemgeo.2017.09.008, 470, 141-151, 2017.10, [URL].
112. Binglin Guo, Keiko Sasaki, Tsuyoshi Hirajima, Selenite and selenate uptaken in ettringite
Immobilization mechanisms, coordination chemistry, and insights from structure, Cement and Concrete Research, 10.1016/j.cemconres.2017.07.004, 100, 166-175, 2017.10, [URL].
113. Binglin Guo, Keiko Sasaki, Tsuyoshi Hirajima, Characterization of the intermediate in formation of selenate-substituted ettringite, Cement and Concrete Research, 10.1016/j.cemconres.2017.05.002, 99, 30-37, 2017.09, [URL].
114. Wuhui Luo, Takeru Fukumori, Binglin Guo, Kwadwo Osseo-Asare, Tsuyoshi Hirajima, Keiko Sasaki, Effects of grinding montmorillonite and illite on their modification by dioctadecyl dimethyl ammonium chloride and adsorption of perchlorate, Applied Clay Science, https://doi.org/10.1016/j.clay.2017.06.025, Vol.146, 15, 325-333, 2017.09.
115. Wuhui Luo, Sasaki Keiko, Tsuyoshi Hirajima, Necessity of pre-dispersion of montmorillonite for its organic modification and the influence on adsorption of perchlorate and methyl red by modified composites, Applied Clay Science, 2017.08.
116. Binglin Guo, Sasaki Keiko, Tsuyoshi Hirajima, Selenite and selenate uptaken in ettringite: Immobilization mechanisms, coordination chemistry and insights from structure, Concrete and Cement Research, 2017.07.
117. 井上聡大, Wuhui Luo, 森山紗好, 平島 剛, 島田 英樹, Keiko Sasaki, 過塩素酸イオン吸着済有機修飾粘土セメント固化体の特性評価, J. MMIJ, 2017.07.
118. Bigling Guo, Sasaki Keiko, Tsuyoshi Hirajima, Structural transformation of selenate ettringite: a hint for exfoliation chemistry, RSCAdvances, 10.1039/c7ra08765a, 7, 42407-42415, 2017.06.
119. Paulmanickam Koilraj, Keiko Sasaki, Selective removal of phosphate using La-porous carbon composites from aqueous solutions
Batch and column studies, Chemical Engineering Journal, 10.1016/j.cej.2017.02.075, 317, 1059-1068, 2017.06, [URL].
120. Binglin Guo, Sasaki Keiko, Tsuyoshi Hirajima, Characterization of an intermediate in formation of selenate-substituted ettringite, Cement and Concrete Research, http://dx.doi.org/10.1016/j.cemconres.2017.05.002, 99, 30-37, 2017.05.
121. Binglin Guo, Sasaki Keiko, Tsuyoshi Hirajima, Solidification of ettringite after uptaking selenate as a surrogate of radionuclide in glass-ceramics by using industrial byproducts, Journal of Material Sciences, in press, 2017.05.
122. Xiangchun Liu, Tsuyoshi Hirajima, Moriyasu Nonaka, Keiko Sasaki, Experimental study on freeze drying of Loy Yang lignite and inhibiting water re-adsorption of dried lignite, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/j.colsurfa.2017.01.076, Vol.520, 146-153, 2017.05, [URL].
123. Subbaiah Muthu Prabhu, Paulmanickam Koilraj, Sasaki Keiko, Synthesis of sucrose-derived amorphous carbon-doped ZrxLa1-xOOH materials and their superior performance for the simultaneous depollution of arsenite and fluoride from binary systems, Chemical Engineering Journal, doi.org/10.1016/j.cej.2017.05.052, 325, 1-13, 2017.04.
124. Paulmanickam Koilraj, Sasaki Keiko, Biomolecule-assisted interlayer anion-controlled layered double hydroxide as an efficient sorbent for arsenate removal, Journal of Materials Chemistry A, in press, 2017.04.
125. Wuhui Luo, Tsuyoshi Hirajima, Keiko Sasaki, Selective adsorption of inorganic anions on unwashed and washed hexadecyl pyridinium-modified montmorillonite, Separation and Purification Technology, 10.1016/j.seppur.2016.12.004, 176, 120-125, 2017.04, [URL].
126. Kojo T. Konadu, Keiko Sasaki, Takashi Kaneta, Grace Ofori-Sarpong, Kwadwo Osseo-Asare, Bio-modification of carbonaceous matter in gold ores
Model experiments using powdered activated carbon and cell-free spent medium of Phanerochaete chrysosporium, Hydrometallurgy, 10.1016/j.hydromet.2016.08.003, 168, 76-83, 2017.03, [URL].
127. Naoko Okibe, Shiori Morishita, Masahito Tanaka, Keiko Sasaki, Tsuyoshi Hirajima, Kazuhiro Hatano, Atsuko Ohata, Bioscorodite crystallization using Acidianus brierleyi
Effects caused by Cu(II) present in As(III)-bearing copper refinery wastewaters, Hydrometallurgy, 10.1016/j.hydromet.2016.07.003, 168, 121-126, 2017.03, [URL].
128. Paulmanickam Koilraj, Sasaki Keiko, Selective removal of phosphate using La-porous carbon composites from aqueous solutions: Batch and column studies, Chemical Engineering Journal, doi.org/10.1016/j.cej.2017.02.075, 317, 1059-1068, 2017.02.
129. Sasaki Keiko, Kenta Toshiyuki, Binglin Guo, Tsuyoshi Hirajima, Calcination effect of borate-bearing hydroxyapatite on mobility of borate, J Hazard Mater, 2017.02.
130. Subbaiah Muthu Prabhu, Sasaki Keiko, Fabrication of chitosan-reinforced ZrxAl1-xOOH nanocomposites and their arsenite and fluoride depollution densities from single/binary systems, Chemistry Select, in press., 2017.02.
131. Wuhui Luo, Akihiro Inoue, Tsuyoshi Hirajima, Keiko Sasaki, Synergistic effect of Sr2+ and ReO4 adsorption on hexadecyl pyridinium-modified montmorillonite, Applied Surface Science, 10.1016/j.apsusc.2016.10.135, 394, 431-439, 2017.02, [URL].
132. Kojo Twum-Knadu, Sasaki Keiko, Takashi Kaneta, Grace Ofori-Sarpong, Kwadwo Osseo-Asare, Bio-modification of carbonaceous matters in gold ore: Model experiments using powdery activated charcoal and cell-free extracts of Phanerochaete chrysosporium, Hydrometallurgy, 168 (2017) 76–83, 2017.01.
133. Wuhui Luo, Tsuyoshi Hirajima, Sasaki Keiko, Selective adsorption of inorganic anions on unwashed and washed hexadecyl pyridinium-modified montmorillonite, Separation and Purification Technology , 176, 120-125, 2017.01.
134. Wuhui Luo, Akihiro Inoue, Tsuyoshi Hirajima, Sasaki Keiko, Synergistic effect on binary adsorption system of Sr2+ and ReO4- as radionuclide surrogates by hexadecyl pyridinium-modified montmorillonite, Applied Surface Science, http://dx.doi.org/10.1016/j.apsusc.2016.10.135, 394, 431-439, 2017.01.
135. Sasaki Keiko, Shugo Nagato, Keiko Ideta, Jin Miyawaki, Tsuyoshi Hirajima, Enhancement of fluoride removal by co-precipitation with Al-substituted hydroxyapatite, Chem. Engng. J., doi.org/10.1016/j.cej.2016.11.096, 311, 284-292, 2017.01.
136. Tsuyoshi Hirajima, Hajime Miki, Gde Pandhe Wisnu Suyantara, Sasaki Keiko, Selective flotation of chalcopyrite and molybdenite with H2O2 oxidation, Minerals Engineering, 100, 83-92, 2017.01.
137. Dewi Agustina Iryani, Satoshi Kumagai, Moriyasu Nonaka, Keiko Sasaki, Tsuyoshi Hirajima, Characterization and Production of Solid Biofuel from Sugarcane Bagasse by Hydrothermal Carbonization, Waste and Biomass Valorization, 10.1007/s12649-017-9898-9, 8, 6, 1941-1951, 2017.01, [URL].
138. Subbaiah Muthu Prabhu, Keiko Sasaki, Fabrication of Chitosan-Reinforced ZrxAl1-xOOH Nanocomposites and Their Arsenite and Fluoride Depollution Densities from Single/Binary Systems, ChemistrySelect, 10.1002/slct.201701072, 2, 22, 6375-6387, 2017.01, [URL].
139. Paulmanickam Koilraj, Keiko Sasaki, Kannan Srinivasan, Novel biomolecule-assisted interlayer anion-controlled layered double hydroxide as an efficient sorbent for arsenate removal, Journal of Materials Chemistry A, 10.1039/c7ta03056h, 5, 28, 14783-14793, 2017.01, [URL].
140. Tsuyoshi Hirajima, Hajime Miki, Gde Pandhe Wisnu Suyantara, Hidekazu Matsuoka, Ahmed Mohamed Elmahdy, Keiko Sasaki, Yuji Imaizumi, Shigeto Kuroiwa, Selective flotation of chalcopyrite and molybdenite with H2O2 oxidation, Minerals Engineering, 10.1016/j.mineng.2016.10.007, 100, 83-92, 2017.01, [URL].
141. Sayo Moriyama, Keiko Sasaki, Tsuyoshi Hirajima, Effect of freeze drying on characteristics of Mg–Al layered double hydroxides and bimetallic oxide synthesis and implications for fluoride sorption, Applied Clay Science, https://doi.org/10.1016/j.clay.2016.07.016, Vol.132-133, 460-467, 2016.11.
142. Qianqian YU, Sasaki Keiko, Microwave-assisted hydrothermal synthesis of nanocrystalline lithium-ion sieve from biogenic manganese oxide, its characterization and lithium sorption studies, Hydrometallurgy, 10.1016/j.hydromet.2015.10.002, Vol.165, Part1, 118-124, 165 (2016) 118–124, 2016.10.
143. Chenyang Li, Lazaro Calderin, Sasaki Keiko, Ismaila Dabo, First-principles Study of the Removal of Boron by Co-precipitation with Hydroxyapatite Using Dolomite as a Starting Material, Bulletin of the American Physical Society, 2016.10.
144. KOILRAJ PAULMANICKAM, Siwaporn Meejoo Smith, Qianqian Yu, Taichi Momoki, Sarah Ulrich, Sasaki Keiko, Encapsulation of powdery spinel type of Li+ ion sieve derived from biogenic manganese oxide in alginate beads, Powder Technology, http://dx.doi.org/10.1016/j.powtec.2016.08.009, 301 (2016) 1201–1207, 2016.08.
145. Sasaki Keiko, Kenta Toshiyuki, Keiko Ideta, Jin Miyawaki, Tsuyoshi Hirajima, Interfacial effects of MgO in hydroxylated calcined dolomite on the co-precipitation of borates with hydroxyapatite, Colloids and Surfaces A: Physicochemical and Engineering Aspects, doi.org/10.1016/j.colsurfa.2016.05.044, 504 (2016) 1–10, 2016.07.
146. Xiangchun Liu, Tsuyoshi Hirajima, Sasaki Keiko, Effects of hydrothermal treatment coupled with mechanical expression on combustion performance of Loy Yang lignite, Journal of Thermal Analysis and Calorimetry, 2016.07.
147. Hajime Miki, Tsuyoshi Hirajima, Sasaki Keiko, Catalytic effect of silver on arsenic-containing copper sulfide dissolution in acidic solution, Hydrometallurgy, https://doi.org/10.1016/j.hydromet.2016.02.007, Vol.162, 1-8, 2016.06.
148. KOILRAJ PAULMANICKAM, Yu Takaki, Sasaki Keiko, Adsorption characteristics of arsenate on colloidal nanosheets of layered double hydroxide, Applied Clay Science, 134 (2016) 110–119, 2016.06.
149. Tsuyoshi Hirajima, Gde Pandhe Wisnu Suyantara, Hajime Miki, Sasaki Keiko, Effect of Mg2+ and Ca2+ as divalent seawater cations on the floatability of molybdenite and chalcopyrite, Minerals Engineering, 96–97 (2016) 83–93, 2016.06.
150. Tsuyoshi Hirajima, Takao Hagino, Sasaki Keiko, Recovery and Upgrading of Phosphorus from Digested Sewage Sludge as MAP by Physical Separation Techniques, Journal of Environmental Protection, doi.org/10.4236/jep.2016.76074, 7, 816-824, 2016.06.
151. Yu Takaki, Xinhong Qiu, Tsuyoshi Hirajima, Keiko Sasaki, Removal mechanism of arsenate by bimetallic and trimetallic hydrocalumites depending on arsenate concentration, Applied Clay Science, 134 (2016) 26–33, 2016.05.
152. Naoko Okibe, Yusei Masaki, Daisuke Nakayama, Sasaki Keiko, Microbial recovery of vanadium by the acidophilic bacterium, Acidocella aromatic, Biotechnology Letters, DOI: 10.1007/s10529-016-2131-2, 38:1475–1481, 2016.05.
153. Wuhui Luo, Tsuyoshi Hirajima, Sasaki Keiko, Optimization of Hexadecylpyridinium-modified Montmorillonite for Removal of Perchlorate Based on Adsorption Mechanisms, Applied Clay Science, https://doi.org/10.1016/j.clay.2016.01.005, Vol.123, 29-36, 2016.04.
154. Dewi Agustina Iryani, Sasaki Keiko, Tsuyoshi Hirajima, HYDROTHERMAL CARBONIZATION KINETICS OF SUGARCANE BAGASSE TREATED BY HOT COMPRESSED WATER UNDER VARIABEL TEMPERATURE CONDITIONS, ARPN Journal of Engineering and Applied Sciences, 11, 7, 4833-4839, 2016.04.
155. Gde Pandhe Wisnu Suyantara, Tsuyoshi Hirajima, Hajime Miki, Sasaki Keiko, EFFECT OF KEROSENE EMULSION IN MgCl2 SOLUTION ON THE KINETICS OF BUBBLE INTERACTION WITH MOLYBDENITE AND CHALCOPYRITE, Colloids and Surfaces A: Physicochemical and Engineering Aspects, in press., 501 (2016) 98–113, 2016.04.
156. Yusei Masaki, Masashi Maki, Daisuke Nakayama, Sasaki Keiko, Naoko Okibe, Microbial recovery of vanadium by Fe(III)-reducing, acidophilic bacterium, Acidocella aromatica PFBC, Biotechnology Letters, 2016.04.
157. Xiangchun Liu, Tsuyoshi Hirajima, Sasaki Keiko, Effect of hydrothermal treatment coupled with mechanical expression on equilibrium water content of Loy Yang lignite and mechanism, Mater. Trans., in press., 2016.04.
158. 太屋岡篤憲, 太屋岡恵里子, 平島 剛, Keiko Sasaki, 信号処理と判別分析法を用いた廃蛍光管の分類, J. MMIJ, 132, 3, 53-58, 2016.04.
159. Airi Harada, Sasaki Keiko, Takashi Kaneda, Direct Determination of Lignin Peroxidase Released from Phanerocheate chrysosprium by In-Capillary Enzyme Assay Using Micellar Electrokinetic Chromatography, Journal of Chromatography A, 1440 (2016) 145–149, 2016.02.
160. Tomoyo Goto, Sasaki Keiko, Synthesis of morphologically controlled hydroxyapatite from fish bone by urea-assisted hydrothermal treatment and its Sr2+ sorption capacity, Powder Technology, 292, 314-322, 2016.02.
161. KOILRAJ PAULMANICKAM, Sasaki Keiko, Fe3O4/MgAl-NO3 layered double hydroxide as magnetically separable sorbent for the remediation of aqueous phosphate, J. Environ. Chem. Engng., http://dx.doi.org/10.1016/j.jece.2016.01.005, 4, 984-991, 2016.01.
162. Sasaki Keiko, Tsuyoshi Hirajima, Kenta Toshiyuki, Dabo Ismaila, Mistuhiro Murayama, Removal mechanism of high concentration borate by co-precipitation with hydroxyapatite, Journal of Environmental Chemical Engineering, http://dx.doi.org/10.1016/j.jece.2016.01.012, 4, 1092-1101, 2016.01.
163. Wuhui Luo, Akihiro Inoue, Tsuyoshi Hirajima, Sasaki Keiko, Sequential modification of montmorillonite with dimethyl dioctadecyl ammonium chloride and benzyl octadecyl dimethyl ammonium chloride for removal of perchlorate, Microporous Mesoporous Materials, http://dx.doi.org/10.1016/j.micromeso.2015.12.030, 233 (2016) 117-124, 2016.01.
164. Mutia Dewi YUNIATI, Keitaro KITAGAWA, Tsuyoshi HIRAJIMA, Hajime MIKI, Naoko OKIBE, Keiko SASAKI, Suppression of pyrite oxidation in acid mine drainage by carrier microencapsulation using liquid product of hydrothermal treatment of low-rank coal, and electrochemical behavior of resultant encapsulating coatings, Hydrometallurgy, https://doi.org/10.1016/j.hydromet.2015.09.028, Vol.158, 83-93, 2015.12.
165. Kojo Twum-Knadu, Sasaki Keiko, Grace OFORI-SARPONG, Kwadwo Osseo-Asare, Takashi Kaneta, Activated carbon as surrogate for carbonaceous matter in gold ores: Degradation via enzyme treatment, Journal of the African Materials Research Society, in press, 2015.12.
166. Xinhong Qiu, Sasaki Keiko, Removal mechanism of polymeric borate by calcined layered double hydroxides containing different divalent metals, Colloids and Surfaces A: Physicochemical and Engineering Aspects, https://doi.org/10.1016/j.colsurfa.2015.07.036, Vol.482, 702-709, 2015.10.
167. Kenta Toshiyuki, Shugo Nagato, Tsuyoshi Hirajima, Sasaki Keiko, Takuro Naruse, Takeshi Kawashima, Influence of Mg components in hydroxylated calcined dolomite to (co-)precipitation of fluoride with apatites, Chem. Engng. J., 10.1016/j.cej.2015.10.029, 285, 487-496, 2015.10.
168. Widi Astuti, Tsuyoshi Hirajima, Sasaki Keiko, Naoko Okibe, Comparison of effectiveness of citric acid and other acids in leaching of different Indonesian low-grade saprolitic ores, Minerals Engineering,, doi:10.1016/j.mineng.2015.10.001, 85, 1-16, 2015.10.
169. Mari YOSHIDA, Paulmanickam KOILRAJ, Xinhong QIU, Tsuyoshi HIRAJIMA, Keiko SASAKI, Sorption of arsenate on MgAl and MgFe layered double hydroxides derived from calcined dolomite, Journal of Environmental Chemical Engineering, https://doi.org/10.1016/j.jece.2015.05.016, Vol.3, Issue 3, 1614-1621, 2015.09.
170. Wuhui Luo, Keiko Sasaki, Tsuyoshi Hirajima, Surfactant-modified montmorillonite by benzyloctadecyldimethylammonium chloride for removal of perchlorate, Colloids and Surfaces A: Physicochemical and Engineering Aspects, https://doi.org/10.1016/j.colsurfa.2015.06.025, 481, 616-625, 2015.09.
171. Liu Xiangchun, Tsuyoshi Hirajima, Sasaki Keiko, Investigation of the Changes in Hydrogen Bonds During Low-Temperature Pyrolysis of Lignite by Diffuse Reflectance FT-IR Combined with Forms of Water, Industrial & Engineering Chemistry Research, in press, 2015.09.
172. Widi ASTUTI, Tsuyoshi Hirajima, Sasaki Keiko, Naoko Okibe, Kinetics of Nickel Extraction from Indonesian Saprolitic Ores by Citric Acid Leaching under Atmospheric Pressure, Minerals & Metallurgical Processing Journal, Vol.32, No.3, in press, 2015.08.
173. Mutia Dewi YUNIATI, Tsuyoshi Hiraji, Hajime Miki, Sasaki Keiko, Silicate Covering Layer on Pyrite Surface in the Presence of Silicon-Catechol Complex for Acid Mine Drainage Prevention, Materials Transactions, https://doi.org/10.2320/matertrans.M-M2015821, Vol.56, Issue 10, 1733-1741, 2015.08.
174. Sayo Moriyama, Sasaki Keiko, Tsuyoshi Hirajima, Sorption properties of boron on Mg–Al bimetallic oxides calcined at different temperatures, Separation and Purification Technology, 152, 192-199, 2015.08.
175. 桃木大地, Qianqian Yu, 平島 剛, Keiko Sasaki, バイオテンプレートイオンシーブによる模擬地熱水からのリチウムイオン吸着特性の速度論的および熱力学的評価, J. MMIJ, 131, 465-469, 2015.07.
176. Wuhui Luo, Sasaki Keiko, Tsuyoshi Hirajima, Effect of surfactant molecular structure on perchlorate removal by various surfactant-modified montmorillonites, Applied Clay Science, 114, 212-220, 2015.06.
177. Moriyasu NONAKA, Tsuyoshi HIRAJIMA, Satoshi KUMAGAI,Keiko SASAKI, Hydrothermal Treatment of Lignite for CO2 Gasification, Journal of MMIJ, Vol.131, No.5, 219-225, 2015.05.
178. Naoko Okibe, Kiyomasa Sueishi, Mikoto Koga, Yusei Masaki, Tsuyoshi Hirajima, Sasaki Keiko, Selenium (Se) Removal from Copper Refinery Wastewater Using a Combination of Zero-Valent Iron (ZVI) and Se(VI)-Reducing Bacterium,Thauera selenatis, Materials Transactions, 2015.04.
179. Xinhong Qiu, Sasaki Keiko, Yu Takaki, Tsuyoshi Hirajima, Keiko IDETA, Jin Miyawaki, Mechanism of boron uptake by hydrocalumite calcined at different temperatures, Journal of Hazardous Materials, 10.1016/j.jhazmat.2015.01.066, Vol.287, 268-277, 2015.04.
180. Xiangchun Liu, Tsuyoshi Hirajima, Moriyasu Nonaka, Anggoro T Mursito, Sasaki Keiko, Use of FT-IR combined with forms of water to study of the changes in hydrogen bonds during low-temperature heating of lignite, Drying Technology, in press, 2015.03.
181. Yusei Masaki, Tsuyoshi Hirajima, Keiko Sasaki, Naoko Okibe, Bioreduction and Immobilization of Hexavalent Chromium by the Extremely Acidophilic Fe(III)‑reducing Bacterium Acidocella aromatica Strain PFBC, Extremophiles, doi: 10.1007/s00792-015-0733-6, Vol.19, Issue 2, pp.495-503, 2015.03.
182. Wuhui LUO, Keiko SASAKI, Tsuyoshi HIRAJIMA, Evaluation of BDTAC, DDAC and BDOAC-modified Montmorillonites for Perchlorate Removal, Fourth International Conference on Multifunctional, Hybrid and Nanomaterials, P1.247, 2015.03.
183. Xinhong Qiu, Sasaki Keiko, Kwadwo Osseo-Asare, Tsuyoshi Hirajima, Keiko IDETA, Jin Miyawaki, Sorption of H3BO3/B(OH)4- on calcined LDHs including different divalent metals , Journal of Colloid and Interface Science, 445, 183-194, 2015.01.
184. Xinhong Qiu, Mari Yoshida, Tsuyoshi Hirajima, Sasaki Keiko, Rapid synthesis of LDHs by using dolomite as a magnesium source and its application in borate removal , Materials Transactions, 2015.01.
185. Tsuyoshi Hirajima, Masanori Mori, Sasaki Keiko, Osamu Ichikawa, Hajime Miki, Mohsen Farahat, Mitsuru Sawada, Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment, Minerals Engineering, doi.org/10.1016/j.mineng.2014.07.011, Vol.66-68, 102-111, 2014.11.
186. Masahito Tanaka, Yuta Yamaji, Yuken Fukano, Kazuhiko Shimada, Junichiro Ishibashi, Tsuyoshi Hirajima, Sasaki Keiko, Mitsuru Sawada, Naoko Okibe, Biooxidation of gold-, silver, and antimony-bearing highly refractory polymetallic sulfide concentrates, and its comparison with abiotic pre-treatment techniques, Geomicrobiology Journal, DOI:10.1080/01490451.2014.981645, 2014.11.
187. Sasaki Keiko, Qianqian Yu, Taichi Momoki, Takuya Kaseyama, Adsorption characteristics of Cs+ ions onto biogenic birnessite, Applied Clay Science, 10.1016/j.clay.2014.06.028, Vol.101, 2014.11.
188. Takeshi Tsuruta, Daishi UMENAI, Tomonobu HATANO, Tsuyoshi Hirajima, Sasaki Keiko, Screening Micro-organisms for Cadmium Absorption from Aqueous Solution and Cadmium Absorption Properties of Arthrobacter nicotianae., Bioscience, Biotechnology, and Biochemistry, doi.org/10.1080/09168451.2014.930321, Vol.78, Issue 10, 1791-1796, 2014.10.
189. Qianqian Yu, Sasaki Keiko, In situ X-ray diffraction investigation of the evolution of a nanocrystalline lithium-ion sieve from biogenic manganese oxide, Hydrometallurgy, 10.1016/j.hydromet.2014.07.002, Vol.150, 253-258, 2014.10.
190. Takehiko TSURUTA, Daishi UMENAI, Tomonobu HATANO, Tsuyoshi HIRAJIMA, Keiko SASAKI, Screening Micro-organisms for Cadmium Absorption from Aqueous Solution and Cadmium Absorption Properties of Arthrobacter nicotianae, Bioscience, Biotechnology, and Biochemistry, http://dx.doi.org/10.1080/09168451.2014.930321, Vol. 78, Issue 10, pp.1791-1796, 2014.10.
191. Tomoyo Goto, Sasaki Keiko, Effect of trace elements in fish bones on crystal characteristics of hydroxyapatite obtained by calcination, Ceramics International, 10.1016/j.ceramint.2014.03.067, Vol.40, Issue 7, PartB, 10777-10785, 2014.08.
192. M.A. Halim, Ratan K. Majumder, G.Rasul, Yoshinari HIROSHIRO, Sasaki Keiko, J. Shimada, Kenji Jinno, Geochemical Evaluation of Arsenic and Manganese in Shallow Groundwater and Core Sediment in Singair Upazila, Central Bangladesh, Arabian Journal for Science and Engineering, Vol.39, Issue 7, 5585-5601, in press, 2014.07.
193. Hisaya TSUJI, Pilasinee LIMSUWAN, Tsuyoshi HIRAJIMA, Keiko SASAKI, Hajime MIKI, Satoshi KUMAGAI, Recovery of Furfural Produced by Hydrothermal Treatment with Biomass Charcoal, International Journal of Environment, Vol.4, No.1, pp.11-17, 2014.06.
194. Naoki Higashidani, Takashi Kaneta, Nobuyuki Takeyasu, Shoji Motomizu, Naoko Okibe, Sasaki Keiko, Speciation of arsenic in a thermoacidophilic iron-oxidizing archaeon, Acidianus brierleyi, and its culture medium by inductively coupled plasma-optical emission spectroscopy combined with flow injection pretreatment using an anion-exchange mini-column, Talanta, 122, 240-245, 2014.05.
195. Sasaki Keiko, Tomoyo Goto, Immobilization of Sr2+ on Naturally Derived Hydroxyapatite by Calcination of Different Species of Fish Bones and Influence of Calcination on Ion-exchange Efficiency, Ceramics International, 10.1016/j.ceramint.2014.03.169, Vol.40, Issue 8, Part A, 11649-11656, 2014.04.
196. Takehiko Tsuruta, Keiko Sasaki, Screening Microorganisms for Cadmium Absorption from Aqueous Solution and the Cadmium Absorption Properties of Arthrobacter nicotianae, Bioscience, Biotechnology, and Biochemistry, in press, 2014.04.
197. Naoko Okibe, Masaharu Koga, Shiori Morishita, Masahito Tanaka, Shinichi HEGURI, Satoshi ASANO, Sasaki Keiko, Tsuyoshi Hirajima, Microbial formation of crystalline scorodite for treatment of As(III)-bearing copper refinery process solution using Acidianus brierleyi, Hydrometallurgy, 143, 34-41, 2014.03.
198. Keiko Sasaki, Xinhong Qiu, Jin Miyawaki, Keiko Ideta, Hitoshi Takamori, Sayo Moriyama, Tsuyoshi hirajima, Contribution of boron-specific resins containing N-methylglucamine groups to immobilization of borate/boric acid in a permeable reactive barrier comprising agglomerated MgO, Desalination, 10.1016/j.desal.2013.11.018, Vol.337, 17, 109-116, 2014.03.
199. Xinhong QIU, Keiko SASAKI, Tsuyoshi HIRAJIMA, Keiko IDETA, Jin MIYAWAKI, One-step Synthesis of Layered Double Hydroxide-intercalated Gluconate for Removal of Borate, Separation and Purification Technology, DOI: 10.1016/j.seppur.2013.12.031. ISSN: 1383-5866., Vol.123, pp.114–123, 2014.02.
200. Xinhong Qiu, Sasaki Keiko, Tsuyoshi Hirajima, Keiko IDETA, Jin Miyawaki, Sorption of borate onto layered double hydroxides assembled in filter papers through in situ hydrothermal crystallization, Applied Clay Science, Vol.88-89, 134-143, 2014.02.
201. Sayo MORIYAMA, Keiko SASAKI, Tsuyoshi HIRAJIMA, Effect of Calcination Temperature on Mg-Al Bimetallic Oxides as Sorbents for the Removal of F- in Aqueous Solutions, Chemosphere, 10.1016/j.chemosphere.2013.10.018, Vol.95, pp.597-603, 2014.01.
202. Sasaki Keiko, Sayo Moriyama, Effect of calcination temperature for magnesite on interaction of MgO-rich phases with boric acid, Ceramics International, 10.1016/j.ceramint.2013.07.056., Vol.40, Issue 1, PartB, 1651-1660, 2014.01.
203. M. A. Halim, R. K. Majumder, M. N. Zaman, S. Hossain, M. G. Rasul, Sasaki Keiko, Mobility and impact of trace metals in Barapukuria coal mining area, Northwest Bangladesh, Arabian Journal of Geoscience, DOI 10.1007/s12517-012-0769-1, Vol.6, Issue 12, 4593-4605, 2013.12.
204. Qianqian Yu, Keiko Sasaki, Tsuyoshi Hirajima, Bio-templated synthesis of lithium manganese oxide microtubes and their application in Li+ recovery, Journal of Hazardous Materials, doi:10.1016/j.jhazmat.2013.08.027, Vol.262, 15, PP.38-47, 2013.11.
205. Sasaki Keiko, Mari Yoshida, Bashir Ahmmad Arima, Naoyuki Fukumoto, Tsuyoshi Hirajima, Sorption of fluoride on partially calcined dolomite, Colloids and Surfaces A: Physicochemical and Engineering Aspects, doi.org/10.1016/j.colsurfa.2012.11.039, Vol.435, 56-62, 2013.10.
206. Qianqian YU, Emiko MORIOKA, Keiko SASAKI, Characterization of Lithium Ion Sieve Derived from Biogenic Mn Oxides, Microporous and Mesoporous Materials, http://dx.doi.org/10.1016/j.micromeso.2013.05.026, Vol.179, pp.122–127, 2013.09.
207. Naoko OKIBE, Masashi MAKI, Keiko SASAKI, Tsuyoshi HIRAJIMA, Mn(Ⅱ)-Oxidizing Activity of Pseudomonas sp. Strain MM1 is Involved in the Formation of Massive Mn Sediments around Sambe Hot Springs in Japan, Materials Transactions, Vol.54, No.10, pp.2027-2031, 2013.09.
208. Naoko Okibe, Masashi Maki, Keiko Sasaki, Tsuyoshi Hirajima, Mn(II)-oxidizing activity of Pseudomonas sp. strain MM1 is involved in the formation of massive Mn sediments around Sambe hot springs in Japan, Materials Transactions, in press, 2013.08.
209. Kazuya Tanaka, Qianqian Yu, Keiko Sasaki, Toshihiko Ohnuki, Cobalt(II) oxidation by biogenic Mn oxide produced by Pseudomonas sp. strain NGY-1, Geomicrobiology Journal, 10.1080/01490451.2013.791352, Vol.30, Issue 10, 874-885, 2013.08.
210. Sasaki Keiko, Qiu Xinhong, Sayo Mortiyama, Chiharu Tokoro, Keiko Ideta, Jin Miyawaki, Characteristic sorption of H3BO3/B(OH)4– on magnesium oxide, Materials Transactions, DOI: 10.2320/matertrans.M-M2013814, Vol.54, No.9, 1809-1817, 2013.08.
211. YU QIANQIAN, Keiko Sasaki, Kazuya TANAKA, Toshihiko OHNUKI, Tsuyoshi Hirajima, Zinc Sorption During Bio-oxidation and Precipitation of Manganese Modifies the Layer Stacking of Biogenic Birnessite, Geomicrobiology Journal, Vol.30, Issue 9, 829-839, 2013.07.
212. Naoko Okibe, Masaharu KOGA, Shinichi HEGURI, Satoshi ASANO, Keiko Sasaki, Tsuyoshi Hirajima, Simultaneous Oxidation and Immobilization of Arsenite from Refinery Waste Water by Thermoacidophilic Iron-oxidizing Archaeon, Acidianus brierleyi, Minerals Engineering, http://dx.doi.org/10.1016/j.mineng.2012.08.009, 48, 126-134, 2013.07.
213. Xinhong Qiu, Sasaki Keiko, Tsuyoshi Hirajima, Keiko IDETA, Jin Miyawaki, Temperature effect on the sorption of borate by a layered double hydroxide prepared using dolomite as a magnesium source, Chemical Engineering Journal, doi.org/10.1016/j.cej.2013.03.099, Vol.225, 664-672, 2013.06.
214. Keiko Sasaki, Xinhong Qiu, Yukiho Hosomomi, Sayo Moriyama, Tsuyoshi Hirajima, Effect of natural dolomite calcination temperature on sorption of borate onto calcined products, Microporous and Mesoporous Materials, 10.1016/j.micromeso.2012.12.029, Vol.171, 1-8, 2013.05.
215. Qianqain YU, Emiko Morioka, Sasaki Keiko, Synthesis of lithium ion sieve derived from biogenic Mn oxides, Microporous Mesoporous Materials, 10.1016/j.micromeso.2013.05.026, 179, 122-127, 2013.05.
216. Keiko Sasaki, Yoshitaka UEJIMA, Atsushi SAKAMOTO, Qianqian Yu, Junichiro Ishibashi, Naoko Okibe, Tsuyoshi Hirajima, Geochemical and Microbiological Analysis of Sambe hot springs, Shimane Prefecture, Japan, Resource Geology, DOI: 10.1111/rge.12002, Vol.63, Issue 2, 155-165, 2013.04.
217. Sayo Moriyama, Sasaki Keiko, Tsuyoshi Hirajima, Effect of calcination temperatures on Mg–Al bimetallic oxides as sorbents for the removal of F− in aqueous solutions, Chemosphere, doi.org/10.1016/j.chemosphere.2013.10.018, in press, 2013.03.
218. Xinhong Qiu, Sasaki Keiko, Tsuyoshi Hirajima, 宮脇 仁, 出田圭子, One-Step Synthesis of layer double hydroxide-intercalated gluconate for borate removal, Separation and Purification Technology, in press, 2013.03.
219. Moriyasu Nonaka, Tsuyoshi Hirajima, Keiko Sasaki, Gravity separation and its effect on CO2 gasification, Fuel, org/10.1016/j.fuel2011.10.074, Vol.103, 37-41, 2013.01.
220. Dewi Agustina IRYANI, 熊谷 聡, Moriyasu Nonaka, Yoshinobu NAGASHIMA, Keiko Sasaki, Tsuyoshi Hirajima, Hot Compressed Water Treatment of Solid Waste Material from the Sugar Industry for Valuable Chemical Production, International Journal of Green Energy , DOI:10.1080/15435075.2013.777909, in press, 2012.12.
221. Sayo Moriyama, Keiko Sasaki, Tsuyoshi Hirajima, Effect of calcination temperatures in producing Mg–Al bimetallic oxides as sorbents for the removal of F− in aqueous solutions, Separation and Purification Technology, 2012.09.
222. Keiko Sasaki, Naoyuki FUKUMOTO, Sayo MORIYAMA, YU QIANQIAN, Tsuyoshi Hirajima, Chemical Regeneration of Magnesium Oxide Used as a Sorbent for Fluoride, Separation and Purification Technology, Vol.98, p.24-p.30, Vol.98. pp.24-30
, 2012.09.
223. Qianqian YU, Keiko Sasaki, Kazuya Tanaka, Toshihiko Ohnuki, Tsuyoshi Hirajima, Structural influences of zinc on the biogenic manganese oxides and concomitant formation of MnO2 nanosheets, Geomicrobiology Journal, 2012.08.
224. Keiko Sasaki, Shoichi Tsuruyama, Sayo Moriyama, Stephanie Handley-Sidhu, Joanna C. Renshaw, Lynne E. Macaskie, Ion Exchange Capacity of Sr2+ onto Calcined Biological Hydroxyapatite
and Implications for Use in Permeable Reactive Barriers, Materials Transactions,, 53, 7, 1267-1272, 2012.07.
225. Qianqian Yu, Keiko Sasaki, Kazuya Tanaka, Toshihiko Ohnuki, Tsuyoshi Hirajima, Structural factors of biogenic birnessite produced by fungus Paraconiothyrium sp.
WL-2 strain affecting sorption of Co2+, Chemical Geology, doi:10.1016/j.chemgeo.2012.03.029, 310-311, 106-113, 2012.07.
226. Keiko SASAKI, Naoyuki FUKUMOTO, Sayo MORIYAMA, Qianqian YU, Tsuyoshi HIRAJIMA, Chemical regeneration of magnesium oxide as a sorbent of fluoride, Separation and Purification Technology, 98, 24-30, 2012.07.
227. Keiko Sasaki, Koichiro Takatsugi, Olli H. Tuovinen, Spectroscopic analysis of the bioleaching of chalcopyrite by Acidithiobacillus caldus, Hydrometallurgy, 127-128, 116-120, 2012.07.
228. YU QIANQIAN, Keiko Sasaki, Kazuya TANAKA, Toshihiko OHNUKI, Tsuyoshi Hirajima, Structural Factors of Biogenic Birnessite Produced by Fungus Paraconiothyrium sp. WL-2 Strain Affecting Sorption of Co2+, Chemical Geology, doi: 10.1016/j.chemgeo.2012.03.029 Vol.310-311, 5, 106-113, 5, pp.106–113, 2012.06.
229. Tsuyoshi Hirajima, Yuki AIBA, Mohsen Farahat, Naoko Okibe, Keiko Sasaki, Takehiko Tsuruta, Katsumi DOI, Effect of Microorganisms on Flocculation of Quartz, International Journal of Mineral Processing, doi:10.1016/j.minpro.2011.10.001, Vol.102-103, 107-111, 2012.01.
230. Himawan Tri Bayu Murti PETRUS, Tsuyoshi Hirajima, Keiko Sasaki, Hideyuki OKAMOTO, Effects of Sodium Thiosulphate on Chalcopyrite and Tennantite; An Insight for Alternative Separation Technique, International Journal of Mineral Processing, dx.doi.org/10.1016/j.minpro.2011.11.002, Vol.102–103, 116-123, 2012.01.
231. 笹木圭子, 微生物による硫化鉱物の浸出反応における不動態化層の特性化(総合論文), 分析化学, 60, 12, 911-919, 2011.12.
232. Naoyuki Fukumoto, Keiko Sasaki, Sayo Moriyama, Tsuyoshi Hirajima, Synthesis of Magnesia as a Reusable Sorbent for Fluoride, Journal of Novel Carbon Resource Sciences, 4, 32-35, 2011.09.
233. Handley-Sidhu S, Renshaw J.C, Sayo MORIYAMA, Stolpe B, Yong P, Mennan C, Bagheriasl S, Stamboulis A, Paterson-Beedle M, Keiko SASAKI, Pattrick R.A.D, Lead J.R, Macaskie L.E., Removal of Sr2+ and Co2+ into Biogenic Hydroxyapatite: Implications for Biomineral Ion Exchange Synthesis, Environmental Science and Technology, 45, 6985-6990, 2011.07.
234. Eljamal, O., Sasaki, K., Hirajima, T., Numerical simulation for reactive solute transport of arsenic in permeable reactive barrier column including zero-valent iron, Applied Mathematical Modelling, 35, 10, 5198-5207, 2011.07.
235. 森 山 紗好, 笹木 圭子, 平島 剛, Mg–Al 系及びMg–Fe 系複合酸化物を用いた水溶液中のB 及びF−の収着, J. MMIJ, 127, 708-713, 2011.05.
236. Koichiro Takatsugi, Keiko Sasaki, Tsuyoshi Hirajima, Mechanism of the enhancement of bioleaching of copper from enargite by thermophilic iron-oxidizing archaea with the concomitant precipitation of arsenic, Hydrometallurgy, 10.1016/j.hydromet.2011.05.013, 109, 90-96, 2011.05.
237. Keiko Sasaki, Koichiro Takatsugi, Tsuyoshi Hirajima, Effects of initial Fe2+ concentration and pulp density on the bioleaching of Cu from enargite by Acidianus brierleyi, Hydrometallurgy, 10.1016/j.hydromet.2011.06.008, 109, 153-160, 2011.05.
238. Keiko Sasaki, Naoyuki Fukumoto, Sayo Moriyama, Tsuyoshi Hirajima, Sorption characteristics of fluoride on to magnesium oxide-rich phases calcined at different temperatures, Journal of Hazardous Materials, 191, 240-248, 2011.04.
239. Moriyasu NONAKA, Tsuyoshi HIRAJIMA and Keiko SASAKI, Upgrading of Low Rank Coal and Woody Biomass Mixture by Hydrothermal Treatment, Fuel, in press, 2011.04.
240. Keiko SASAKI, Hitoshi TAKAMORI, Sayo MORIMAYA, Hitoshi YOSHIZAKA, Tsuyoshi HIRAJIMA, Effect of Saw Dusts on Borate Removal from Groundwater in Bench-scale Simulation of Permeable Reactive Barriers Including Magnesium Oxide, Journal of Hazardous Materials, https://doi.org/10.1016/j.jhazmat.2010.10.067, Vol.185, Issues 2-3, 1440-1447, 2011.01.
241. H.T.B.M. Petrus, Tsuyoshi Hirajima, Yuji Oosako, Moriyasu Nonaka, Keiko Sasaki, Takashi Ando, Performance of dry-separation processes in the recovery of cenospheres from fly ash
and their implementation in a recovery unit, International Journal of Mineral Processing, 98 (2011) 15–23, 2011.01.
242. Anggoro Tri Mursito, Tsuyoshi Hirajima, Keiko Sasaki, Alkaline hydrothermal de-ashing and desulfurization of low quality coal
and its application to hydrogen-rich gas generation, Energy Conversion and Management, 52, 762-769, 2011.01.
243. Himawan Tri Bayu Murti PETRUS, 平島 剛, 笹木 圭子, Effect of pH and Diethyl Dithiophosphate (DTP) Treatment on Chalcopyrite and
Tennantite Surface Observed Using Atomic Force Microscopy (AFM), Colloids and Surface A: Physicochemical and Engineering Aspects, 2011, 9, Vol.389, Issues 1-3, pp.266-273, 2011.01.
244. H. T. B. M. Petrus, T. Hirajima, K. Sasaki, H. Okamoto, Study of Diethyl Dithiophosphate Adsorption on Chalcopyrite and Tennantite at Varied pHs, Journal of Mining Science, 47, 5, 695-702, 2011.01.
245. OSAMA ELJAMAL , KEIKO SASAKI, Shoichi Tsuruyama, TSUYOSHI HIRAJIMA, Kinetic Model of Arsenic Sorption onto Zero-Valent Iron, Water Quality, Exposure and Health, DOI 10.1007/s12403-010-0030-7, in press, 2010.12.
246. Ahmad T. YULIANSYAH, Tsuyoshi HIRAJIMA, Satoshi KUMAGAI, Keiko SASAKI, Production of Solid Biofuel from Agricultural Wastes of the Palm Oil Industry by Hydrothermal Treatment, Waste and Biomass Valorization, in press, 2010.12.
247. Abdul M. HALIM, R. K. MAJUMDER, S. A. NESSA, Y. HIROSHIRO, Keiko SASAKI, B. B. SAHA, A. SAEPULOH, Kenji JINNO, Trace metals in water and sediment from coal mine discharge canal in the Boropukuria, Bangladesh: mobility and environmental significance assessment, J. Hazardous Mater., in press, 2010.07.
248. Keiko SASAKI, Koichiro TAKATSUGI, Tsuyoshi HIRAJIMA, Kenji KANEKO, Toshihiko OHNUKI, , Olli H. TUOVINEN, Characterization of secondary formed As-bearing precipitates in bioleaching of enargite by As-adapted Acidithiobacillus ferrooxidans, Hydrometallurgy, 104, 424-431, 2010., 2010.07.
249. M. A. Halim, R. K. Majumder, S. A. Nessa, K. Oda, Y. Hiroshiro, B. B. Saha, K. Sasaki, K. Jinno, Evaluation of processes controlling the geochemical constituents in deep groundwater in Bangladesh: spatial variability on arsenic and boron enrichment
, Journal of Hazardous Materials, 180, 50-62, 2010.06.
250. Mohsen FARAHAT, Tsuyoshi HIRAJIMA, Keiko SASAKI, Adhesion of Ferroplasma acidiphilum onto Pyrite Calculated from the Extended DLVO Theory using the Van Oss-Good-Chaudhury Approach, Journal of Colloid & Interface Science, 349, 594-601, 2010.06.
251. Tsuyoshi Hirajima, H.T.B.M. Petrus, Yuji Oosako, Moriyasu Nonaka, Keiko Sasaki, Takashi Ando, Recovery of cenospheres from coal fly ash using a dry separation process: Separation estimation and potential application, International Journal of Mineral Processing, 95, 18-24, 2010.06.
252. Anggoro Tri MURSTO, Tsuyoshi HIRAJIAM, Keiko SASAKI, Satoshi KUMAGAI, The effect of hydrothermal dewatering of Pontianak tropical peat on organics in wastewater and gaseous products, Fuel, in press, 2010.06.
253. Keiko SASAKI, Koichiro TAKATSUGI, Kazuhiro ISHIKURA, Tsuyoshi HIRAJIMA, Spectroscopic study on oxidative dissolution of chalcopyrite, enargite and tennantite at different pHs, Hydrometallurgy, 100, 144-151, Vol. 100, pp.144-151, 2010, 2010.01.
254. Pauliina NURMI, Bestamin ÖZKAYA, Keiko SASAKI, Anna H. KAKSONEN, M.-R. Riekkola-VANHANEN, Olli H. TUOVINEN, Jaakko A. PUHAKKA, Biooxidation and Precipitation for Iron and Sulfate Control in Heap Bioleaching Waste Streams, Hydrometallurgy, 101, 7-14, 2010.01.
255. Anggoro T MURSITO, Tsuyoshi HIRAJIMA, Keiko SASAKI, Upgrading and Dewatering of Raw Tropical Peat by Hydrothermal Treatment, Fuel, 89, 635-641, 2010.01.
256. Keiko SASAKI, Takuya KASEYAMA, Tsuyoshi HIRAJIMA, Selective sorption of cobalt over nickel using biogenic manganese oxides, Materials Transactions, Vol. 50, pp.2643-2648, 2009, 2009.11.
257. K. SASAKI, K. TAKATSUGI, T. HIRAJIMA, N. KOZAI, T. OHNUKI, O. H. TUOVINEN, Bioleaching of Enargite by Arsenic-torelant Acidithiobacillus ferrooxidans, Advanced Materials Research, 71-73, 485-488, 2009.10.
258. K. SASAKI, T. KASEYAMA, T. HIRAJIMA, Selective Sorption of Ce3+ over La3+ ion on Biogenic Manganese Oxides, Advanced Materials Research, 71-73, 633-636, 2009.10.
259. 笹木圭子、堀 修、荻野 激、高野敬志、遠藤祐司、恒川昌美、平島 剛, 北海道上ノ国人工湿地における重金属処理
~重金属の土壌への固定形態と土壌微生物の役割~, MMIJ, Vol.125, No.8, pp.445-452, 2009, 2009.08.
260. 笹木圭子、荻野 激、堀 修、高野敬志、遠藤祐司、桜井善文, 北海道上ノ国人工湿地における重金属処理
~湿地性植物の重金属吸収特性~, MMIJ, Vol.125, No.8, pp.453-460, 2009, 2009.08.
261. Mohsen Farahat, Tsuyoshi Hirajima, Keiko Sasaki , Katsumi Doi, Adhesion of Escherichia coli onto Quartz, Hematite and Corundum: Extended DLVO Theory and Flotation Behavior, Colloids and Surfaces B: Biointerfaces, Vol. 74, pp.140-149, 2009, 2009.07.
262. K. SASAKI, Y. NAKAMUTA, T. HIRAJIMA, O. H. TUOVINEN, Raman Characteristics of Secondary Minerals Formed During Chalcopyrite Leaching with Acidithiobacillus ferrooxidans, Hydrometallurgy, 95, 153-158, 2009.05.
263. Keiko Sasaki, Yousuke Nakamuta, Tsuyoshi Hirajima, Olli H. Tuovinen, Raman characterization of secondary minerals formed during chalcopyrite leaching with Acidithiobacillus ferrooxidans, Hydrometallurgy, Vol. 95, (2009) pp.153-158., 2009.01.
264. K. Sasaki, H. Nakano, W. Wilopo, Y. Miura, T. Hirajima, Sorption and speciation of arsenic by zero-valent iron, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 347, 8-17, 2009, 2008.12.
265. Wahyu Wilopo, Keiko Sasaki, Tsuyoshi Hirajima, Toshiro Yamanaka, Immobilization of Arsenic and Manganese in Contaminated Groundwater by Permeable Reactive Barrier Using Zero Valence Iron and Sheep Manure, Materials Transactions, Vo. 49, No. 10, pp. 2265-2274, 2008.10.
266. W. WILOPO, K. SASAKI, T. HIRAJIMA, Identification of Sulfate- and Arsenate-Reducing Bacteria in Sheep Manure As Permeable Reactive Materials after Arsenic Immobilization in Groundwater., Materials Transactions, Vol. 49, No. 10, pp.2275-2282, 2008.10.
267. Olia V. Karnachuk, Keiko Sasaki, Anna L. Gerasimchuk, Olga Sukhanova, Denis A. Ivasenko, Anna H. Kaksonen, Jaakko A. Puhakka, Olli H.Tuovinen, Precipitation of Cu-sulfides by Copper-tolerant Desulfovibrio Isolates, Geomicrobiology Journal, Vol. 25, pp. 1-8, 2008.07.
268. KEIKO SASAKI, DAVID W. BLOWES, CAROL J. PTACEK, Spectroscopic study of precipitates formed during removal of selenium from mine drainage spiked with selenate using permeable reactive materials, Geochemical Journal, Vol. 42, pp. 283-294, 2008.06.
269. Keiko Sasaki,Shunsuke Nukina,Wahyu Wilopo, Tsuyoshi Hirajima, Removal of arsenate in acid mine drainage by a permeable reactive barrier bearing granulated blast furnace slag: column study, Materials Transactions, Vol. 49(4), pp. 835-844, 2008.04.
270. K. Sasaki, H. Tachibana, Y. Ogawa, H. Konno, Oxidation of Mn(II) Ions in Model and Actual Manganese Drainages by a Fungus Closely Related to Phoma sp. like strain KY-1, Materials Transaction, Vol. 49(4), pp. 845-849, 2008.04.
271. K. Sasaki, D. W. Blowes, C. J. Ptacek, Immobilization of selenate in mine drainage by permeable reactive barriers: column performance., Applied Geochemistry, Vol. 23, No. 5, pp. 1012-1022, 2008.02.
272. K. Sasaki, M. Matsuda, T. Urata, T. Hirajima, H. Konno, Sorption of Co2+ ions on the biogenic Mn deposits by a Mn-oxidizing fungus,Paraconiothyrium sp.-like strain WL-2, Materials Transaction, Vol. 49(3), pp. 605-611, 2008.01.
273. Mohsen Frahat, Tsuyoshi Hirajima, Keiko Sasaki, Yuuki Aiba, Katsumi Doi, Adsorption of SIP E. coli onto quartz and its applications in froth flotation, Minerals Engineering, Vol.21(5), pp.389-395, 2007.12.
274. 野中壮泰、平島 剛、廣瀬歩美、笹木圭子, 水熱処理によるバイオマス・低品位炭混合燃料化での分解抽出挙動, 資源と素材, 123、532-536, 2007.11.
275. Jonathan P. Gramp, Jerry M. Bigham, Keiko Sasaki, and Olli H. Tuovinen, Formation of Ni- and Zn-sulfides in cultures of sulfate-reducing bacteria., J. Geomicrobiology, Vol, 24, pp. 2-7, 2007.11.
276. K. Sasaki, M. Matsuda, T. Urata, T. Hirajima, H. Konno, Sorption of Co ions on biogenic Mn oxides produced by a Mn-oxidizing fungus, Paraconiothyrium sp.-like strain., Advanced Materials Research)., 20-21, 607-610, 2007.07.
277. Hidetaka KONNO, Keiko SASAKI, Yuuki OGAWA, Hideki TACHIBANA, Singular effect of carbon fibers on the oxidation of dissolved Mn(II) ions by a fungus closely related to Phoma sp., Materials Transactions, 48(1), 64-67, 2007.01.
278. Jonathan P. Gramp, Keiko SASAKI, Jerry M. Bigham, Olia V. Karnachuk, Olli H. Tuovinen, Formation of covellite (CuS) under biological sulphate-reducing conditions., Geomicrobiology Journal, 23, 613-619, 2006.11.
279. 野中壯泰、平島剛、柿添亮平、笹木圭子、土屋富士雄、鶴井雅夫, ベンチスケール連続式水熱処理装置におけるバイオマス・低品位炭混合燃料の製造, 資源と素材, Vol. 122, No. 10,11, pp.522-527, 2006.10.
280. Keiko SASAKI, Minoru Matsuda, Tsuyoshi Hirajima, Keishi Takano, Hidetaka Konno, Immobilization of Mn(II) by a Mn-oxidizing fungus Paraconiothryum sp. like strain at neutral pHs., Mater. Trans., 47, 10, 2457-2461, 2006.10.
281. K. Sasaki, T. Sakimoto, M. Endo and H. Konno, FE-SEM study of microbiologically formed jarosites by Acidithiobacillus ferrooxidans., Mater. Trans., 47(4), 1155-1162, 2006.05.
282. Keishi TAKANO, Yasoo ITOH, Tagiru OGINO, Kunihiko KUROSAWA, Keiko SASAKI, Phylogenetic analysis of manganese-oxidizing fungi isolated from manganese-rich aquatic environment in Hokkaido, Japan., Limnology, 2006.01.
283. 笹木圭子, 微生物を媒介としたマンガンの鉱化作用とその環境修復への展望, 資源地質, 55(2), pp. 195-202, 2005.12, [URL].
284. 笹木圭子, 透過型反応バリアによる地下水汚染修復, ぶんせき, 2005.12.
285. T. Hirajima, A. Bissombolo, K. Sasaki, K. Nakayama, H. Hirai, and M. Tsunekawa, Floatability of rare earth phosphors from waste fluorescent lamps, Intl. J. Miner. Proc., 10.1016/j.minpro.2005.05.002, 77, 4, 187-198, 77, 187-198, 2005.11.
286. T. Hirajima, K. Sasaki, A. Bissombolo, M. Hamada, M. Tsunekawa, Feasibility of an efficient recovery of rare earth-activated phosphors from waste fluorescent lamps through dense-medium centrifugation., Separation and Purification Technology, 10.1016/j.seppur.2004.12.014, 44, 3, 197-204, 44, 197-204, 2005.07.
287. Keiko Sasaki, David Blowes, Carol Ptacek, Spectroscopic study of removal of Se(VI) from mine drainage by areactive permeable barrier column, Groundwater Quality, 2004.07.
288. K. Sasaki, H. Konno, M. Endo, K. Takano, Removal of Mn(II) ions by manganese-oxidizing fungus at neutral pHs in the presence of carbon fiber., Biotechnol. Bioengng., 85(5), 491-496, 2004.06.
289. 金野英隆、遠藤真衣、橘英樹、笹木圭子, 炭素繊維によるマンガン酸化真菌の活性化-繊維であることの重要性-, 炭素, 215, 246-248, 2004.01.
290. K. K. Yoo, K. Sasaki, N. Hiroyoshi, M. Tsunekawa, T. Hirajima, The Effect of Mn2+ concentration on Mn removal by a sulfate-reducing bacteria bioreactor., Mater. Trans., 10.2320/matertrans.45.2429, 45, 7, 2429-2434, 2004.01.
291. K. K. Yoo, K. Sasaki, N. Hiroyoshi, M. Tsunekawa, Fundamental study on the removal of Mn2+ in acid mine drainage using sulfate-reducing bacteria., Mater. Trans., 10.2320/matertrans.45.2422, 45, 7, 2422-+, 2004.01.
292. 湯川健太郎,平島 剛,恒川昌美,須山千秋,笹木圭子,福嶋正巳,小林弘幸,平井 智, 熱水乾燥法による低品位炭改質時に生成する溶液のキャラクタリゼーションとそのCr(VI)還元能, 資源と素材, 第119号, 4,5号,161-169頁, 2003.05.
293. 平島 剛,小林弘幸, 湯川健太郎,恒川昌美,福嶋正巳, 笹木圭子, 大里克明, 須藤良考, 水熱処理法による木質系バイオマス燃料製造に関する基礎的研究, 資源と素材, 119, 118-124, 2003.01.
294. 笹木圭子, 平島 剛, 芳賀生憲, 黒沢邦彦, 恒川昌美, 休廃止鉱山の鉱滓堆積場における鉛直コアの鉱物分布., 資源処理技術, 48, 75-84, 2001.01.
295. 笹木圭子, 小林弘幸, 恒川昌美, ホタテ貝殻と石灰石を原料としたaragoniteの合成 .-逐次反応による形態制御-, 資源と素材, 117, 747-752, 2001.01.
296. K. Sasaki, T. Yamashita, M. Tsunekawa, Synthesis of aragonite from calcined scallop shells - Morpholigical characterization by FE-SEM., Shigen-to-Sozai, 118, 553-558, 2002.01.
297. K. Sasaki, M. Endo, K. Kurosawa, and H. Konno, Removal of manganese ions from water by Leptothrix discophora with carbon fiber., Mater. Trans., 43(11), 2773-2777, 2002.01.
298. K. Sasaki, N. Haga, T. Hirajima, K. Kurosawa, M. Tsunekawa, Distribution and transition of heavy metals in mine tailing dumps., Mater. Trans., 43(11), 2778-2783, 2002.01.
299. K. K. Yoo, K. Sasaki, T. Hirajima, M. Tsunekawa, Analysis of heavy metals in a tailing impoundment of abandoned Mn mine by using two sequential extractions., Mater. Trans., 43(12), 3189-3194, 2002.01.
300. 小林弘幸,平島 剛,湯川健太郎,恒川昌美,福嶋正巳,笹木圭子,大里克明,須藤良考, 水熱処理法による木質系バイオマス燃料製造とその生成液体によるCr(VI)還元, 資源と素材, 第119巻,6,7号,419-422, 2003.01.
301. 笹木圭子, 富岡祐司, 平島 剛, 恒川昌美, Acidithiobacillus ferrooxidans による硫ヒ鉄鉱の溶解と有機酸による抑制に関する研究., 資源と素材, 119, 61-65, 2003.01.
302. K. Sasaki, T. Ogino, Y. Endo, K. Kurosawa, Field study on heavy metal accumulation in the natural wetland receiving acid mine drainage, Mater. Trans., 44(9), 1877-1884, 2003.01.
303. K. Sasaki, T. Ogino, O. Hori, Y. Endo, K. Kurosawa, M. Tsunekawa, Chemical transportation of heavy metals in the constructed wetland impacted by acid drainage., Mater. Trans., 44(2), 305-312, 2003.01.
304. K. Sasaki, H. Konno, Morphological change of jarosite groups formed from biologically and chemically oxidized Fe(III) ions., Can. Mineral., 38, 45-56, 2000.01.
305. 笹木圭子, 平島 剛, 大沼英明, 芳賀生憲, 恒川昌美, 西尾広志, Cu錯体による水溶性切削油剤中の硫酸還元菌の増殖および活性阻害に関する研究", 資源処理技術, 46(3), 153-160, 1999.01.
306. 平島 剛, 笹木圭子, 芳賀生憲, 大沼英明, 恒川昌美, 西尾広志, 水溶性切削液の腐敗防止に関する研究, 資源と素材, 115, 240-244, 1999.01.
307. 金野英隆,伊東隆史,尾谷 賢,笹木圭子, 混合原子価モリブデンオキシ水酸化物皮膜の電析とそのキャラクタリゼーション, 表面技術, 50, 909-914, 1999.01.
308. K. Sasaki, M. Tsunekawa, S. Tanaka, M. Fukushima and H. Konno, Inhibiting effect of natural organic acids on microbially mediated dissolution of pyrite in acidic environments., Shigen-to-Sozai, 115, 233-239, 1999.01.
309. K. Nakayasu, M. Fukushima, K. Sasaki, S. Tanaka, and H. Nakamura, Comparative studies of the reduction behavior of chromium (VI) by humic substances and their precursors., Environ. Toxicol. Chem., 18, 1085-1090, 1999.01.
310. M. Fukushima, S. Tanaka, K. Nakayasu, K. Sasaki, and K. Tatsumi, Evaluation of copper(II) binding abilities of humic substances by a continuous site-distribution model considering proton competition., Anal. Sci., 15, 185-188, 1999.01.
311. 笹木圭子, 本郷 大, 恒川昌美, 廃ホタテ貝殻焼成物を原料としたaragonite型軽質炭酸カルシウムの合成 (第3報).-常温水溶液系における高純度aragoniteの合成-, 資源と素材, 114, 715-720, 1998.01.
312. 笹木圭子, 本郷 大, 恒川昌美, 廃ホタテ貝殻焼成物を原料としたaragonite型軽質炭酸カルシウムの合成 (第2報).-aragonite型炭酸塩を種結晶として用いる方法-, 資源と素材, 114, 709-713, 1998.01.
313. K. Sasaki, M. Tsunekawa, T. Ohtsuka and H. Konno, The role of sulfur-oxidizing bacteria, Thiobacillus thiooxidans, in pyrite weathering., Colloids and Surfaces A: Phisicochemical and Engineering Aspects, 133(3), 269-278, 1998.01.
314. K. Sasaki, O. Tanaike and H. Konno, Distinction of jarosite compounds by Raman spectroscopy., Can. Mineral., 36, 1225-1235, 1998.01.
315. 笹木圭子, Thiobacillus ferrooxidans の介在により生成したジャロサイト群の形態的特徴., 鉱物学雑誌, 26, 47-50, 1997.01.
316. 笹木圭子, 本郷 大, 恒川昌美, 廃ホタテ貝殻焼成物を原料としたアラゴナイト型軽質炭酸カルシウムの合成 (第1報).-非晶質炭酸カルシウムを中間体とする方法-, 資源と素材, 113, 1055-1058, 1997.01.
317. K. Sasaki, Raman study of the microbially mediated dissolution of pyrite by Thiobacillus ferrooxidans., Can. Mineral., 35(4), 999-1008, 1997.01.
318. M. Fukushima, S. Tanaka, K. Nakayasu, K. Sasaki, H. Nakamura and K. Tatsumi, Investigation of copper(II)-binding behavior of fulvic acids by three-dimensional fluorescence spectrometry., Anal. Sci., 13, 1007-1011, 1997.01.
319. K. Sasaki and M. Tsunekawa, Evaluation of tannic and fulvic acids as inhibitors of cell growth, and iron and sulfur oxidation in Thiobacillus ferrooxidans and Thiobacillus thiooxidans., Shigen-to-Sozai (J. Min. Mat. Proc. Inst. Japan), 112, 929-933, 1996.01.
320. K. Sasaki, M. Tsunekawa and H. Konno, Effect of cations on pyrite oxidation with Fe(III) ions near pH 2., Shigen-to-Sozai (J. Min. Mat. Proc. Inst. Japan), 112, 231-237, 1996.01.
321. K. Sasaki, M. Tsunekawa and H. Konno, Effect of Fe(II) ions on pyrite oxidation with Fe(III) ions near pH 2., Shigen-to-Sozai (J. Min. Mat. Proc. Inst. Japan), 112, 49-53, 1996.01.
322. K. Sasaki, M. Tsunekawa, S. Tanaka and H. Konno, Suppression of microbially mediated dissolution of pyrite by originally isolated fulvic acids and related compounds., Colloids and Surfaces A: Physicochemical and Engineering Aspects, 119, 241-253, 1996.01.
323. K. Sasaki, M. Tsunekawa, T. Ohtsuka and H. Konno, Confirmation of sulfur-rich layer formed on pyrite after dissolution by Fe(III) ions around pH 2., Geochim. Cosmochim. Acta, 59, 3155-3158, 1995.01.
324. K. Sasaki, M. Tsunekawa, K. Hasebe and H. Konno, Effect of anionic ligands on the reactivity of pyrite with Fe(III) ions in acid solutions., Colloids and Surfaces A: Physicochemical and Engineering Aspects, 101, 39-49, 1995.01.
325. K. Sasaki, M. Tsunekawa and H. Konno, Characterization of argentojarosite formed from biologically oxidized Fe(III) ions., Can. Mineral., 33(6), 1311-1319, 1995.01.
326. 笹木圭子, 恒川昌美, 金野英隆, 酸性溶液における黄鉄鉱の酸化溶解の不定比性., 分析化学, 43, 911-917, 1994.01.
327. K. Sasaki, H. Konno and M. Inagaki, Structural strain in pyrite evaluated by X-ray powder diffraction., J. Mater. Sci., 29, 1666-1669, 1994.01.
328. K. Sasaki, Effect of grinding on the rate of oxidation of pyrite by oxygen., Geochim. Cosmochim. Acta, 58, 4649-4655, 1994.01.
329. 笹木圭子, 恒川昌美, 金野英隆, 平島 剛, 高森隆勝, Thiobacillus ferrooxidans による黄鉄鉱浸出の挙動と鉱物表面のキャラクタリゼーション, 資源と素材, 109, 29-35, 1993.01.
330. 高森隆勝, 笹木圭子, 恒川昌美, 平島 剛, Thiobacillus ferrooxidans による黄銅鉱精鉱浸出の挙動とその機構, 資源と素材, 106, 173 -179, 1990.01.
331. 金野英隆, 笹木圭子, 恒川昌美, 高森隆勝, 古市隆三郎, バクテリアリーチングにおけるパイライト表面生成物のX線光電子分光分析, 分析化学, 40, 609-616, 1991.01.
332. 高森隆勝, 山本琢也, 笹木圭子, 恒川昌美, 平島 剛, Thiobacillus ferrooxidans とThiobacillus thiooxidans の共存系における黄銅鉱精鉱浸出の挙動及び細胞外放出物質としての燐脂質, 資源と素材, 106, 611-616, 1990.01.
333. M. Sugawara, K. Sasaki, T. Kambara, Surface-tention titration of calcium(II)and Manganese (II) by using triethanolamine as masking reagent, Fresenius Z. Anal. Chem., 313,237, 1982.12.
主要総説, 論評, 解説, 書評, 報告書等
1. 笹木 圭子,コジョ トワム コナドゥ, 酵素反応を取り入れたグラファイト質難処理金鉱石のバイオミネラルプロセシング, The Micromeritics, 10.24611/micromeritics.2020008, 2019.12, Graphitic refractory gold ore was sequentially pretreated to oxidize sulfides by thermophilic archaeon Acidianus
brierleyi and then to decompose carbonaceous matters using the cell-free spent medium (CFSM) from
a white-rot fungus Phanerochaete chrysosporium. The pretreatment by A. brierleyi significantly improved the
gold recovery from 25% to 77%. Additionally, the crude lignin-degrading enzymes in the CFSM converted
the carbonaceous matters into more easily degradable substances, which were removed by alkaline washing,
leading to a final gold recovery of 92%. These mineralogical alterations were confirmed by differential thermogravimetric
analysis and quantitative evaluation of minerals with scanning electron microscopy. Based on
the results, gold grains were mostly liberated after bio-oxidation of sulfides, and in following CFSM treatment,
large particles of carbonaceous aluminosilicate were formed from the aggregation of clay minerals, gold grains
and with partially decomposed carbonaceous matters acting as binders..
2. 後藤知代、笹木圭子, 魚骨由来水産アパタイトを利用した浄化材料の開発, 日本無機材料学会誌, 2018.07.
3. Keiko Sasaki, 菌糸を鋳型としたリチウムイオンシーブの合成, 無機マテリアル学会誌, 2014.10.
4. Sasaki Keiko, Spectroscopic study on bioleaching of enargite using thermophile, in “Microbiology for Minerals, Metals, Materials and Environment”, Edited by Abhilash, B. D. Pandey, K. A. Natarajan, CRC Press/Taylor and Francis, ISBN-978-1-4822-5729-8, Cat. No.K24089, 2014.10.
5. 笹木圭子, 硫化鉱物の微生物による浸出反応における不動化層の特性化, 分析化学, 60(12), 911-919 (2011), 2011.02.
6. 笹木 圭子、所 千晴, フィンランドの鉱区活用および休廃止鉱区環境対策, J. MMIJ, 2011.12.
7. 笹木圭子, 北米における透過型浄化壁による地下水浄化技術の調査, (独)新エネルギー・産業技術総合開発機構, 2007.03.
8. 笹木圭子, 微生物を媒介としたマンガンの鉱化作用とその環境修復への展望, 資源地質, 55(2)、195-202, 2005.12.
9. 笹木圭子, 透過型反応バリアによる地下水汚染修復, ぶんせき, 11、635-637, 2005.11.
10. 笹木圭子, 微生物機能により形成されたマンガン酸化物の環境工学的利用の可能性, 化学と工業, 54(1), 48, 2001.01.
11. 笹木圭子, 黄鉄鉱の常温酸化溶解に関する実験地球化学的研究, 鉱物学雑誌, 27, 93-103, 1998.10.
主要学会発表等
1. engmeng WANG, Hirofumi AKAMATSU, Keiko SASAKI, Interaction of amino acids with selenate-bearing hydrocalumite as a model of low level radioactive waste, International Symposium on Earth Science and Technology 2020, 2020.11.
2. Li Zhang, Chitiphon Chuaicham, Keiko Sasaki, Electronic structure of ferric doped montmorillonite and its application to photocatalytic reduction of chromate, International Symposium on Earth Science and Technology 2020, 2020.10.
3. 笹木圭子, 超難処理金鉱石のバイオハイドロメタラジー, 東北大学多元物質研究所研究発表会, 2019.12.
4. 笹木圭子, 酵素反応をとりいれたグラファイト質難処理金鉱石のミネラルプロセッシング, 日本粉体工学会, 2019.05.
5. 笹木圭子, バイオテクノロジーによる難処理金鉱石からの金回収率の向上, 日本技術士会, 2019.10.
6. Kojo Twum Konadu, Keiko Sasaki,, Challenges to gold recovery from carbonaceous gold ores using biotechnology, 1st International Conference of Asia Pacific Mining and Metallurgy, 2019.11.
7. Kojo T. Konadu, Kwadwo Osseo- Asare, Keiko Sasaki, Challenges to gold recovery from carbonaceous gold ores using biotechnology , African MRS 2019, 2019.12.
8. Takashi Kaneta, Airi Harada, Sumire Kudo, Hiroe Kubota, Keiko Sasaki, Determination of lignin-modifying enzymes by capillary electrophoresis using in-capillary reactions, International Biohydrometallurgy Symposium 2019, 2019.11.
9. Kojo T. Konadu, Ryotaro Sakai, Diego M. M. Flores, Susan T. L. Harrison, Kwadwo Osseo- Asare, Keiko Sasaki, Effect of carbonaceous matter on bioleaching of Cu from carbonaceous chalcopyrite ore, International Biohydrometallurgy Symposium 2019, 2019.10.
10. Keiko Sasaki, Fungally formed Mn oxides and their application to bio-templated Li+ ion sieve, International Biohydrometallurgy Symposium 2019, 2019.10, Manganese oxides are the most reactive adsorbents and oxidants which widely control the cycling of nutrients, metals and carbons as well as the fate of contaminants in environments. Microbial catalysis to oxidize Mn(II) is the primary pathway for the generation of Mn ox-ides in nature. Recent discoveries have identified two important roles of Mn-oxidizing mi-croorganisms for the formation of biogenic Mn oxides: the formation of extracellular su-peroxide (O2-) as an effective oxidant of Mn(II) to Mn(III/IV), and production of organic ligand metabolites to stabilize Mn(III) against its reduction by hydrogen peroxide, which is a reaction product to generate O2-. A Mn-oxidizing fungus, Paraconiothyrium sp. WL-2, which possess high tolerance to Mn(II) as well as great ability to oxidize high concentra-tions of Mn(II), was applied to form the biogenic Mn oxides on the surface of fungal hy-phae as a precursor to an adsorbent for recovery of Li+. Through the solid state reaction, the bio-templated adsorbent of Li+ was synthesized maintaining the tubular shape of fungal hyphae. Biogenic birnessite produced larger fractions of an active constituent as an adsorbent of Li+ than abiotic birnessite, resulting in greater adsorption capacity of Li+ despite its smaller BET specific surface area. Selectivity of Li+ in the presence of 100 times of Na+ concentra-tions, and reusability after acid washing were also evaluated. The application can be realized being based on the several characteristic properties of biogenic Mn oxides: secreted extra-cellular superoxide as an oxidant of Mn(II), secreted metabolites as ligands to Mn(III), for-mation of poorly crystalline birnessite on tubular fungal hyphae as a bio-template, adsorption of Li+ on poorly crystalline birnessite, and easy phase transformation of poorly crystalline birnessite..
11. Keishi Oyama, Kyohei Takamatsu, Hajime Miki, Keiko Sasaki, Naoko Okibe, Carbon-assisted bioleaching of primary copper sulfides, International Biohydrometallurgy Symposium 2019, 2019.10.
12. Kojo T. Konadu, Susan T. L. Harrison, Kwadwo Osseo-Asare, Keiko Sasaki, Bio-mineral processing of double refractory gold ore in sequential treatment using a thermophilic archaeon followed by fungal spent medium, International Biohydrometallurgy Symposium 2019, 2019.10.
13. Quanzhi Tian , Binglin Guo , Shingo Nakama , Li Zhang, Zhaochu Hu, Keiko Sasaki, Suppression of Anionic Pollutant Leaching from Coal Fly Ash by Adding Hydroxylated Calcined Dolomite , Goldschmidt 2019, 2019.08.
14. Binglin Guo, Yihuang Xiong , Weinan Cheng , Sarah Saslow , Ismaila Dabo, Keiko Sasaki , First-Principles Investigations into Iodide and Iodate Incorporation Mechanism into Ettringite, Goldschmidt 2019, 2019.08.
15. Chitiphon Chuaicham, Keiko Sasaki, Energy-resolved distribution of electron traps study for ZnTi mixed metal oxides as photocatalysts to degrade phenol, ACS 2019 Fall, 2019.08.
16. Chitiphon Chuaicham , Keiko Sasaki, Surface Plasmon Resonance Enhanced Visible-Light-Driven Photocatalytic Degradation of Rhodamine B by Sepiolite/C3N4/Pd Nanoparticles Composites, Euroclay2019, 2019.07.
17. 可村 雄生太  Paulmanickam Koilraj  笹木 圭子, 金属イオン吸着材としての層状複水酸化物/酸化グラフェン複合体のアルギン酸ビーズによる集積化, 平成30年度 資源・素材学会 秋季大会              , 2018.09.
18. Radheshyam R Pawar and Keiko Sasaki, Modulated water-based synthesisof Zr-fumarate MOFs for high-efficiency treatment of selenite and selenate from the aqueous solutions, ACS PACCON 2019, 2019.02.
19. Chitiphon Chuaicham, Keiko Sasaki, Surface Plasmon Resonance Enhanced Visible-Light-Driven Photocatalytic Degradation of Rhodamine B by Sepiolite/Carbon Nitride/Pd Nanoparticles Composites, ACS PACCON 2019, 2019.02.
20. Kancharla Srinivasarao, Keiko Sasaki, Covalently functionalized graphene oxide for the recovery of palladium from spent nuclear fuel, ICEAn 2018, 2018.08.
21. Keiko Sasaki, Binglin Guo, Reduction of selenate in ettringite by calcination, Goldschmidt 2018, 2018.08.
22. Binglin Guo, Keiko Sasaki, Confinement of iodide and iodate in ettringite: the plausible mechanism for various inorganic anions selective incorporation, Goldschmidt 2018, 2018.08.
23. Binglin Guo, Keiko Sasaki, Immobilization of iodine and selenium as radionuclide surrogates in cement related materials , PACCON 2019, 2019.02, The confinement of radionuclides or hazardous elements is an important issue for preventing environmental contamination and helping to maintain safe ecosystems for living organisms. Among the radioactive isotopes, the 129I and 79Se isotope are considered as remarkable environmental risk related to nuclear waste storage and/or disposal because of their relatively long half-life (1.57×107 years and 2.95×105, respectively) and high mobility in soil and aqueous system. Since radioactive isotopes are a relatively emergent contaminant and nuclear wastes are usually immobilized in cement, immobilization of I and Se species to cementitious materials is of great interest. As a major and active component in hydrated cement, ettringite is assumed to play a role in immobilization of toxic anions because of its ion-exchange ability. The present talk will display the immobilization mechanisms and properties of iodine and selenium as radionuclide surrogates in ettringite. In addition, the stability of ettringite after uptake toxic anions is also discussed. After accumulation of radionuclides from a contaminated source, ettringite should be stabilized before landfilling for long time storage. An investigation into developing the alternative method to stabilize hazardous wastes by using industrial byproduct/wastes to synthesis glass-ceramics can be also conducted..
24. Shingo Nakama, Quanzhi Tian, Binglin Guo, Niko Dian Pahlevi, Zhaochu Hu, Keiko Sasaki, Suppression mechanism of anionic pollutants released from fly ash by Ca additives, 米国化学会, 2018.03.
25. Chitiphon Chuaicham, Keiko Sasaki, Effects of precursors on the photocatalytic activities of graphitic carbon nitride in hexavalent chromium reduction and rhodamine B degradation under visible light irradiation, 米国化学会, 2018.03.
26. Kojo Twum Konadu, Keiko Sasaki, Kwadwo Osseo-Asare, Takashi Kaneta, Effect of lignin degrading enzymes on the decomposition of large aromatic hydrocarbons using coronene as a surrogate for powdered activated carbon, International Biohydrometallurgy Symposium, 2017.09.
27. Keiko Sasaki, Yoshikazu Hayashi, Binglin Guo, Immobilization of borate and arsenate from geothermal waters by co-precipitation with hydroxyapatite, Goldschmidt 2017, 2017.08.
28. Wuhui Luo, Sasaki Keiko, Synergistic adsorption of Sr2+ and ClO4− on alginate-encapsulated organo-montmorillonite, Hybrid Materials 2017, 2017.03.
29. Paulmanickam Koilraj, Keiko Sasaki, Multifunctional bio-molecules: A precipitant and anion controlling agent on the synthesis of layered double hydroxides and their arsenate adsorption, Hybrid Materials 2017, 2017.03, Arginine is an important biomolecule, which are widely used as ingredients in food and pharmaceuticals industries [1]. Recently, amino acids are utilized for the synthesis of simple metal oxides and/or metal hydroxides, which showed remarkable electronic and adsorption properties. However, the challenges are the preparation of mixed metal hydroxides or layered double hydroxide (LDHs) using these biomolecules [2]. At present, we have synthesised LDHs using multifunctional amino acids as precipitant and labile anion controlling agent and used for the remediation of aqueous arsenate.
Synthesis of MgAl-LDHs (Mg/Al atomic ratio of 3.0) with controlled labile anion was synthesised by hydrothermal method at 100-150 oC using arginine. Thus prepared materials were utilized for the remediation of aqueous arsenate.
PXRD showed that pure nitrate containing LDHs was obtained at lower temperature due to water hydrolysis. Conversely, at higher temperature LDHs showed carbonate as interlayer anion due to the decomposition amino acid into NH4+ and CO2 which act as precipitant and interlayer anion respectively. Arsenate adsorption studies indicated that the adsorption density is directly related to the amount of labile nitrate present in the interlayer and showed maximum of 1.657 mmol/g for LDH synthesised at 100oC. The mechanism of LDH formation and arsenate adsorption was elucidated by different physicochemical analyses.
In conclusion, for the first time MgAl LDHs with different composition of interlayer anion were synthesised by hydrothermal method using amino acid as precipitant and anion controlling agent without any external base. The products obtained at the end of synthesis are LDH and arginine cation. The LDHs obtained here are used as adsorbent and the arginine cation could be used as chemical intermediates with zero waste disposal promising its superiority..
30. Yuta Kamura, Paulmanickam Koilraj, Keiko Sasaki, Carbon-dot/layered double hydroxide nanocomposite for the co-immobilization of strontium and selenate , CINEST 2016, 2016.12, sStrontium (Sr2+) and anionic sselenate (SeO42-) are the by-products of nuclear reaction. Co-immobilization of these ions are highly desired for total remediation of radioactive waste water. Carbonaceous nanomaterials are received great attention in the field of water remediation and pollution control in recent years. However, the handling of these nanomaterials are very challenging due to increase in the bio-availability and toxicity. At present, Mg2Al-NO3 layered double hydroxides (LDHs) was synthesized and modified using carbon nano-dots. Thus prepared materials were characterized through different physicochemical analyses such as PXRD, FT-IR, Zeta potential and TEM. Strontium and selenate adsorption on Mg2Al-NO3-LDH/C-dot composites showed that the strontium immobilization capacities were increased with increase in the amount of carbon-dot. The mechanism of Sr2+ adsorption on these composites occurs via co-ordination with –COO- group of carbon-dot, while SeO42- occurs through ion-exchange of nitrate present in the interlayer galleries of LDH. These results promising the use carbon-dot/LDH composite materials for the total remediation of both anionic and cationic radioactive nuclides from waste water.

.
31. Sasaki Keiko, Bioleaching of Cu from enargite using thermoacidophilic iron-oxidizing archaeon, Acidianus brierleyi: Spectroscopic study for stabilizing As, Copper 2016, 2016.11.
32. Sasaki Keiko, Wuhui Luo, GRINDING EFFECTS OF MONTMORILLONITE AND ILLITE ON FOLLOWING MODIFICATION BY DIOCTADECYL DIMETHYL AMMONIUM CHLORIDE AND ITS APPLICATION IN PERCHLORATE REMOVAL, Asian Clay 2016, 2016.11.
33. Qianqian Yu, Keiko Sasaki, BIOTEMPLATED SYNTHESIS OF A LITHIUM ION-SIEVE DERIVED FROM BIOGENIC MN OXIDE
, Asian Clay 2016, 2016.11, Microbial oxidation is a primary pathway for the Mn oxides formation in nature. Its unique structural properties provide potential for materials scientists to fabricate new functionalized materials. Using Mn oxidizing fungus Paraconiothyrium sp. WL-2 as a bio-oxidizer as well as a bio-template, a special lithium ion sieve with microtube morphology was prepared by calcination. The poorly crystalline Mn oxide facilitates the formation of well crystalline lithium ion sieve at a relatively lower temperature. The effect of calcination temperature was studied by using in situ X-ray diffraction (XRD), Rietveld analysis, X-ray absorption fine structure (XAFS) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). We found that changes of calcination temperature affected the crystal structure (e.g. contents of the spinel phase), the morphology, as well as the chemical composition (e.g. the average oxidation state of Mn) of the product. And the sorption capacity of lithium ion sieve is related with the content of Mn(III) in spinel phase. The optimized sample shows lithium adsorption capacity which is more than twice higher than particulate materials..
34. Sasaki Keiko, NATURAL ATTENUATION OF ARSENATE-CONTAMINATED RIVER IMPACTED BY ACID MINE DRAINAGES: CHARACTERIZATION OF SUSPENDED PARTICULATE MATTERS , ICHMET 2016, 2016.09.
35. Binglin Guo, Keiko Sasaki, Tsuyoshi Hirajima, COORDINATION CHEMISTRY OF SELENATE IN ETTRINGITE, ICHMET 2016, 2016.09, Introduction
Selenium often occurs in association with sulfide minerals by replacement with sulfur, and its toxicity is known as being associated with a number of specific diseases such as nail abnormalities and changes in peripheral nerves. Selenite (SeO32–) and selenite (SeO42–)are much more mobile and toxic in ecosystems. Furthermore, the high mobility of radionuclide 79Se in aqueous environments can pose the terrible threat because most minerals' surfaces are negatively charged in earth crust and it has a long half life time around 2.95×105 years.
Ettringite, which is one of calcium aluminum hydroxysulfates with several crystal water molecules, often occurs in some alkaline environments like cements. It has a general composition of A6B2(C)3(OH)12•26H2O, where A is Ca2+, Sr2+, Cd2+, Co2+; B is Cr3+, Al3+, Fe3+, Mn4+, Si4+; and C is some anions such as SO42– and SeO42– (Gougar et al., 1996). The unit cell of the crystal consists of columns of {Ca6[Al(OH)6]2・24H2O]}6+ with the inter-column spaces occupied by 3 moles of divalent anions (C) and 2 moles of H2O, which hold columns together through electrostatic force. It has been proved by the bond valence theory that AsO43– is complexed with some functional groups on the surface of columns in ettringite (Myneni et al., 1998). Thus, there are two possibilities in incorporations of oxoanions in ettringite, which are the substitution of intercolumn oxoanions or the coordination of oxoanions with functional group on ettringite. This should affect to the chemical stability of anionic species, which are sometimes pollutants in ettringite.
It is not yet clear whether SeO42– is sorbed through inner-sphere complexation or outer-sphere complexation in ettringite. In other word, the bonding Ca(Al)-O-Se-O3 should be created through covalent bond while the bonding H•••••O-Se-O3 should be formed in the later through electrostatic force. In the present work, ettringite containing different concentrations of selenate was characterized by Fourier Transform infrared spectroscopy (FTIR) and bond valence theory to figure out the sorption mechanism of selenate in ettringite.
Methods
Ettringite was synthesized with the stoichiometric amounts of Ca(OH)2 and Al2(SO4)3 with different concentrations of Na2SeO4 (0.5–20mM) in ultrapure water. All solutions were prepared by deionized water and reagent-grade chemicals. The mixture were covered with parafilm to avoid getting CO2 and stirred using a magnetic stirrer at room temperature for 120 min. Then the pH of supernatant was recorded and suspension was filtered by membrane filter for determination of remaining Ca, Al, Se and S concentrations using inductively coupled plasma optical emission spectrometry(ICP-OES).The precipitates were examined by using scanning electron microscope (SEM), X-ray diffraction (XRD), and FTIR. Bond valence theory(Brown et al.,1985)was also applied to calculate the coordination numbers of O atoms in SeO42–assurface functional groups of ettringite.

Results
Changes of water chemistry during immobilization of SeO42– in ettringite were monitored until the equilibrium by determination using ICP-OES. Based on the results of XRD for the solid residues, there is no other phases than ettringite with increase in SeO42–concentrations. Moreover, SEM image has shown needle-like crystals, which are characteristic to ettringite. These results suggest that immobilized SeO42- were completely substituted into inter column spaces in ettringite structure. Furthermore, as shown XRD results, with increasing the amount of immobilized SeO42-in ettringite, the cell parameters a and c also increased.
In ettringite, there are several types of –OH groups including ≡Ca-OH2, ≡Al-OH and ≡Ca2-OH, which produce board FTIR peaks to assign to the stretching vibration mode of O-H around 3200 to 3560 cm-1. Incorporation of SeO42-into the columns of ettringite perturbed the –OH stretching vibration. With increasing the amount of immobilized SeO42– in ettringite, the intensities of–OH stretching peaks decreased in the range of 3250 to 3400 cm-1 which is assigned to the –OH stretching vibration of ≡Ca-OH2.This indicates that SeO42-interacted with H2O which is coordinated to Ca. Based on the structure of ettringite, ≡Ca-OH2, ≡Al-OH and ≡Ca2-OH sites are arranged in the column surfaces, where≡Ca-OH2 is the most dominant sites. According to the bond valence theory, Se-O has1.62 valence units (v.u.) and O-H does about 0.78 v.u. Ligand exchange to such as ≡Ca-OH-SeO3 does not happen, because Se-O-H bond has been already saturated (Brown et al.,1985). Similar characteristic of AsO43- has been also demonstrated (Myneni et al., 1998). In ettringite, SeO42– can be only interacted with these function groups through the formation of inner-sphere complexes of ≡Ca-O-SeO3. It is supposed that the significant change in –OH vibrations may result from the SeO42– sorption in ettringite and the formation of inner-sphere complexes.
Conclusions
The ettringite shows promising application in immobilization of large concentrations of SeO42– in aqueous environments. In the present work, the mechanism of SeO42– by co-precipitation with ettringite was discussed. According to the FTIR spectra, the peak intensity in –OH stretching mode vibration significantly decreased with increasing the amount of immobilized SeO42– in ettringite. Furthermore, based on the XRD patterns, sorption of SeO42– increased the cell parameters a and c of ettringite. EXAFS and TG-DTA analysis would exemplify this assumption.
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36. Wuhui Luo, Keiko Sasaki, ADSORPTION CHARACTERISTICS OF HAZARDOUS INORGANIC OXOANIONS ON ORGANOHDPy-MODIFIED -MONTMORILLONITE, ICHMECT 2016, 2016.09, Introduction
Adsorption of individual anions on organo-montmorillonite (OMt) was has been well investigated in previous studies (Bagherifam et al., 2014; Choung et al., 2014). In those studies different amounts of organic modifier with variable structures were usedapplied, resulting in no criterion for comparing the selectivity of anions to OMt. A systematic study in terms of adsorption of six anions on three surfactant-modified bentonites was has been conducted (Behnsen and Riebe, 2008). Their results showed the relationship between affinity and hydration energy of the anions. Besides, the amount of released organic modifier may be associated with the species of target anions. Compared with poorly hydrated anions of smaller size, a fully hydrated anion of larger size would be less able to penetrate into the head group region of a cationic surfactant for effective neutralization of the bilayer (Leontidis et al., 2002). As a result, the original counter ion would be readily replaced with those poorly hydrated anions to form tight binding and to minimize the repulsive force, inhibiting the dissociation of adsorbed surfactant back into the bulk aqueous solution (Li et al., 1997). Thus, to compareit is of great significance to evaluate the adsorption characteristic of inorganic different oxoanions, which include hazardous heavy metals and are often mobile in environments, on OMt is of great significance.
Methods
10 g of Mt with a cation exchange capacity (CEC) of 111.4 meq/100g was dispersed in 500 mL deionized water at room temperature for 2 h. Separately, 44.56 mmol of HDPy-Cl, corresponding to four times the CEC of Mt, was dissolved in 500 mL deionized water. The HDPy-Cl solution was then slowly added into the Mt suspension and the mixture was vigorously stirred for 24 h. The obtained solid was separated by centrifugation, freeze-dried, ground, and sieved.
1.0 mmol/L Na2MoO4, Na2SO4, NaClO4, NaReO4, NaI, KIO3, NaBrO3, NaNO3, Na2SeO3, Na2SeO4, Na2CrO4, Na2WO4, NaVO3, and KH2AsO4 were separately prepared, without pH adjustment. Forty mg HDPy/Mt was dispersed in 50 mL target anion-bearing solution and then shaken at 25 °C for 24 h. The pH and Eh of solutions before and after adsorption were measured. After the mixture was filtered through a 0.45-μm filter, the obtained solution was provided to determine the residual anion concentration in equilibrium using ion chromatography (Dionex ICS-2100, Sunnyvale, CA, USA), and inductively coupled plasma atomic emission spectroscopy (ICP-AES, Seiko Instruments, Chiba, Japan). The amount of released HDPy was determined by UV-vis spectroscopy (UV-2450, Shimadzu, Tokyo, Japan) at 258 nm. The solid was dried and supplied for X-ray diffraction (XRD) measurement to investigate changes in interlayer space.
Results and Discussion
Based on pH and Eh values before and after adsorption, chemical speciation of all anions was not expected to change during adsorption on HDPy/Mt. Among the selected anions, with the exception of IO3, H2AsO4, and CrO42, monovalent anions showed higher adsorption capacities and selectivities on HDPy/Mt than divalent anions. Besides, higher adsorption capacities normally corresponded to the lower amounts of HDPy release as support by the negligible HDPy release after adsorption of monovalent anions. Release of HDPy led to the decrease of interlayer distance as proved by XRD patterns. The released HDPy presented in different forms in solution, which depends on anion species. After adsorption of the anions showing high affinity to HDPy/Mt, HDPy were slightly released in form of HDPy-target anion such as HDPy-NO3, whereas significantly released in form of HDPy-Cl for poorly selective anions which are mainly highly hydrated divalent anions. Hydration of counter ion (Cl) was the driving force of ion exchange, which accounted for the adsorption of inorganic anions on HDPy/Mt. Desorption-adsorption made partial contribution to adsorption of several anions. Dehydration of anions with stronger hydration shells consumed more energy to intercalate into HDPy/Mt and resulted in the decrease of selectivity. Moreover, the increase of dielectric constant of organic-like interlayer phase derived from HDPy release was another key factor influencing adsorption of anions on HDPy/Mt.
Conclusions
Monovalent anions normally showed higher adsorption capacities and selectivities and led to lower HDPy release on HDPy/Mt than divalent anions, because of the higher energy consumption for dehydration of divalent anions. Hydration of counter ion (Cl) was the driving force of anions adsorption on HDPy/Mt. Selectivity of HDPy/Mt to anions depended not only on the change in anionic size in different phases (from r1 in aqueous solution to r2 in the organic solvent-like OMt), but also variation of dielectric constant after HDPy release.
.
37. Binglin Guo, Keiko Sasaki, Removal of selenate by co-precipitate with ettringite in aqueous solution, Goldschmidt 2016, 2016.06, Selenium can be toxicant with high concentrations in aqueous solutions. and 79Se isotope is also one of the radionuclides present in high-level nuclear wastes with long half life periods. Because of negative surface charge of the most minerals in earth crust. S, selenate is quite mobile in ground waters.
Ettringite (Ca6Al2(SO4)3(OH)12•26H2O) is known as one of products formed in an early stage during hydration of Portland cement and can also occur naturally. The structure of ettringite consists consisting of column parts ({consisting of {Ca6[Al(OH)6]2・24H2O]} 6+) and channel parts (including tetrahedral SO42- and H2O). It has been reported that Ca2+, Al3+ and SO42- can be replaced with nuclide species. Selenate can also be partly and fully substituted with sulfate.
In the present work, we have investigated in on immobilization of selenate by co-precipitation with ettringite. , resulting in different types of ettringite by mixing stoichiometric amounts of Ca(OH)2 and Al2(SO4)3, AlCl3 with Na2SeO4 in ultrapure water. Using Ca(OH)2 and AlCl3 as Ca and Al sources, selenate was substituted with sulfate in ettringite, giving providing the highest concentration of Se in the solid residues. The potential stability of selenate-substituted ettringite has been assessed by exposing in aqueous solution under the different pHs. It is was found that more than 90% of selenate was immobilized in the structure of ettringite under the initial pH value from 5 to 11.This suggests that selenate can be effectively immobilized in the structure of ettringite in wide range of pH.
.
38. Keiko Sasaki, Application of iron-oxidizing archeaon to biohydrometallurgy of enargite, Goldschmidt 2016, 2016.06, Microbial oxidation of Fe2+ and reduced sulfur species is a basic reaction to dissolve sulfides in biohydrometallurgy. Although chalcopyrite (CuFeS2) is known as a main Cu resource, arsenic-bearing copper sulfides like enargite (Cu3AsS4) are often accompanied in deep copper ore deposits. To recover Cu even from arsenic-bearing coper sulfides, arsenic immobilization should be considered. Acidianus brierleyi, which is an iron-oxidizing hyperthermophilic archeaon, was applied to bioleaching of enargite at 70˚C in the presence of Fe2+ ions as an energy source in a lab scale to find the optimal condition and elucidate the mechanism under the optimal condition. By controling Fe2+ concentrations and pulp density of enargite, 91% of Cu recovery with immobilizing 94% of arsenic species was concurrently achieved. According to the comprehensive interpretation of XANES As K-edge, XRD, and SEM-EDX, the main storage of arsenic was scorodite (FeAsO4), which is in the most ideal form because of high stability and high density of arsenic. Although the released species from enargite is arsenite and A. brierleyi does not oxidize arsenite into arsenate, arsenic was mainly immobilized as scorodite under the optimized condition. Based on spectroscopic and microscopic observation of not only bulk reaction but also interface reaction involving biological tissues, the reaction mechanism is discussed..
39. 笹木 圭子, 利行謙汰, 平島 剛, Ca(OH)2をカルシウム源としたホウ酸のハイドロキシアパタイトとの共沈による不動化機構, 一般社団法人 資源・素材学会 平成28(2016)年度 春季大会, 2016.03.
40. 長門周吾, 平島 剛, 笹木 圭子, アパタイトとの共沈によるフッ素の不動化におけるAl3+の影響, 一般社団法人 資源・素材学会 平成28(2016)年度 春季大会, 2016.03.
41. 羅武輝, 平島 剛, 笹木 圭子, アルギン酸被覆した有機粘土を用いた過塩素酸、ストロンチウム吸着, 一般社団法人 資源・素材学会 平成28(2016)年度 春季大会, 2016.03.
42. 井上聡大, 羅武輝, 笹木 圭子, 平島 剛, 陽イオン性界面活性剤を用いた有機修飾粘土による陰陽両イオン性放射性核種スロゲートの吸着特性, 一般社団法人 資源・素材学会 平成28(2016)年度 春季大会, 2016.03.
43. Kojo Konadu, Sasaki Keiko, Kwadwo Osseo-Asare, Grace OFORI-SARPONG, Activated carbon as surrogate for carbonaceous matter in gold ores: degradation via enzyme treatment, International Conference of the African Materials Research Society , 2015.12.
44. Shugo NAGATO, Tsuyoshi Hirajima, Sasaki Keiko, Effect of Al3+ Additives on Fluoride Removal by (Co-)Precipitation as Apatites, International Symposium on Earth Science and Technology 2015 (CINEST), 2015.12.
45. Kenta TOSHIYUKI, Tsuyoshi Hirajima, Sasaki Keiko, Co-Precipitation of Boron with Hydroxyapatite Using Various Ca Sources, International Symposium on Earth Science and Technology 2015 (CINEST), 2015.12.
46. Yu TAKAKI, Paulmanickam KOILRAJ, Tsuyoshi Hirajima, Sasaki Keiko, Delaminated Layered Double Hydroxide Nanosheets for Arsenate Immobilization, International Symposium on Earth Science and Technology 2015 (CINEST), 2015.12.
47. Wuhui Luo, Tsuyoshi Hirajima, Sasaki Keiko, Adsorption of Perchlorate on Slurry-like Modified Montmorillonite by Hexadecylpyridinium Chloride, The 6th Asian Conference on Colloid and Interface Science (ACCIS 2015), 2015.11.
48. KOILRAJ PAULMANICKAM, Sasaki Keiko, Amino acid anchored layered double hydroxide nanosheets and their Co2+ cation sorption behavior, The 6th Asian Conference on Colloid and Interface Science (ACCIS 2015), 2015.11.
49. Widi Astuti, Tsuyoshi Hirajima, Sasaki Keiko, Naoko Okibe, Utilization of Metabolic Citric Acid from Aspergillus niger Using Corn Starch in the Nickel Leaching of Indonesian Saprolitic Ore, 19th International Biohydrometallurgy Symposium 2015 (IBS 2015), 2015.10.
50. Sasaki Keiko, (invited) Spectroscopic and microscopic investigation in biohydrometallurgy , International Biohydrometallurgy Symposium 2015 (IBS 2015), 2015.10.
51. Kojo Konadu, Sasaki Keiko, Kwadwo Osseo-Asare, Bio-modification of carbonaceous matters in gold ore: Model experiments using powdered activated charcoal and cell-free extracts of Phanerochaete chrysosporium, 19th International Biohydrometallurgy Symposium 2015, 2015.10.
52. Naoko Okibe, Masahito Tanaka, Sasaki Keiko, Tsuyoshi Hirajima, Effect of Cu(II) on bio-scorodite crystallization using Acidianus brierleyi, International Biohydrometallurgy Symposium 2015, 2015.10.
53. Sasaki Keiko, Spectroscopic and Microscopic Investigation for Biohydrometallurgy, 21st International Biohydrometallurgy Symposium (IBS 2015), 2015.10.
54. Sasaki Keiko, Bio-modification of carbonaceous matters in gold ore: Model experiments using powdered activated charcoal and cell-free extracts of Phanerochaete chrysosporium, 21st International Biohydrometallurgy Symposium (IBS 2015), 2015.10.
55. Yu Takaki, Xinhong Qiu, Tsuyoshi Hirajima, Sasaki Keiko, Removal mechanism of arsenate by hydrocalumite depending on arsenate concentration, EUROCLAY 2015, 2015.07.
56. Wuhui Luo, Sasaki Keiko, Synthesis of surfactant-modified montmorillonites for adsorption of perchlorate, EUROCLAY 2015, 2015.07.
57. Akihiro Inoue, Wuhui Luo, Sasaki Keiko, Sequential Modification of Montmorillonite Using DDAC and BDOAC for Adsorption of Perchlorate, International Symposium Zeolite and Microporous Crystals 2015 (ZMPC 2015), 2015.07.
58. Paulmanickam KOILRAJ, Sasaki Keiko, Fe3O4@MgAl-NO3 Layered Double Hydroxide as Magnetically Separable Phosphate Sorbent From Aqueous Solution, International Symposium on Zeolite and Microporous Crystals 2015(ZMPC2015), 2015.07.
59. Yu TAKAKI, Paulmanickam KOILRAJ, Tsuyoshi Hirajima, Sasaki Keiko, Adsorption Characteristic of Arsenate on Delaminated Layered Double Hydroxides, Euroclay2015, 2015.07.
60. 長門周吾, 利行謙汰, 平島 剛, 笹木 圭子, 川島健, アパタイト生成によるフッ化物イオンの不動化におけるMg2+イオンの影響, 資源・素材学会九州支部平成27 年度総会・春季例会・若手研究者および技術者の研究発表会, 2015.06.
61. 井上聡大, 羅武輝, 平島 剛, 笹木 圭子, 有機修飾粘土による過塩素酸イオンの新規吸着剤の合成〜異種陽イオン性界面活剤の逐次修飾効果〜, 資源・素材学会九州支部平成27 年度総会・春季例会・若手研究者および技術者の研究発表会, 2015.06.
62. Akihiro INOUE, Wuhui LUO, KWADWO OSSEO-ASARE, Tsuyoshi Hirajima, Sasaki Keiko, Sequential Modification of Montmorillonite Using DDAC and BDOAC for Adsorption of Perchlorate, International Symposium on Zeolite and Microporous Crystals 2015(ZMPC2015), 2015.06.
63. Xinhong Qiu, Sasaki Keiko, Synthesis of layered double hydroxide intercalated with gluconate for removal of boron species, 4th International Conference on Multifunctional Hybride and Nanomaterials (Hybride Materials 2015), 2015.03.
64. Wuhui Luo, Sasaki Keiko, Evaluation of BDTAC, DDAC and BDOAC-modified montmorillonites for perchlorate removal, Hybride Materials 2015, 2015.03.
65. KOILRAJ PAULMANICKAM, Sasaki Keiko, Srinivasan KANNAN, Amino acid assisted solvothermal synthesis of layered double hydroxides, Hybride Materials 2015, 2015.03.
66. Sasaki Keiko, Biohydrometallurgy of enargite: A spectroscopic investigation of bioleaching by thermoacidophilic iron-oxidizing archaeon, Acidianus brierleyi , IGO-2015, 2015.01.
67. Sasaki Keiko, Sequential modification of montmorillonite using DDAC and BDOAC for removal of perchlorate: Effect of DDAC dosage
, CINEST 2014, 2014.12.
68. Shugo NAGATO, Kenta TOSHIYUKI, Takeshi KAWASHIMA, Tsuyoshi Hirajima, Sasaki Keiko, Enhancement in precipitation rate of fluoroapatite by Mg2+ additives: Advanced utilization of hydrate of calcined dolomite in water treatment, International Symposium on Earth Science and Technology 2014 (CINEST), 2014.12.
69. Keiko Sasaki, Qianqain Yu, Synthesis of biogenic Mn oxide and its engineering application to Li ion sieve, 247th American Chemical Society, 2014.03.
70. 野中 壯泰, 平島 剛, 笹木 圭子, 高水分褐炭の改質に伴う性状変化, 資源・素材学会春季大会, 2013.03.
71. 森優典, 平島 剛, 笹木 圭子, 市川修, 澤田満, 硫化鉱物浮選に関する研究, 資源・素材学会春季大会, 2013.03.
72. 辻 久也, 熊谷 聡, 笹木 圭子, 平島 剛, ココナッツシェルの水熱処理により生成したフルフラールの炭化物による分離, 資源・素材学会春季大会, 2013.03.
73. Pilasinee LIMSUWAN, 熊谷 聡, Moriyasu Nonaka, Keiko Sasaki, Wiwut TANTHAPANICHAKOON, Tsuyoshi Hirajima, Application of Plasma Treated Activated Carbon to Enhancement of Phenol Removal by Ozonation in Three-Phase Fluidized Bed Reactor, 2013 3rd International Conference of Key Engineering Materials(ICKEM 2013), 2013.03.
74. 熊谷 聡, 辻久也, 坂本元, 野中 壯泰, 平島 剛, ココナッツシェルの水熱処理と反応生成物の分離, 第8回バイオマス科学会議, 2013.01.
75. Himawan Tri Bayu Murti PETRUS, Tsuyoshi Hirajima, Yuji OOSAKO, Moriyasu Nonaka, Keiko Sasaki, Takashi ANDO, Sustainable Recovery of Cenospheres from Coal Fly Ash Using Dry Separation Processes, The 5th AUN/SEED-Net Regional Conference on Materials Engineering & The 5th Regional Conference on Natural Resources and Materials, 2013.01.
76. Tsuyoshi Hirajima, Himawan Tri Bayu Murti PETRUS, Keiko Sasaki, Hideyuki OKAMOTO, Selective Removal of Tennantite from Copper Concentrates, The 5th AUN/SEED-Net Regional Conference on Materials Engineering & The 5th Regional Conference on Natural Resources and Materials, 2013.01.
77. N. PHOUMIPHON, Hasmaliza MOHAMAD, Tsuyoshi Hirajima, Radzali OTHMAN, Granite Waste as a Raw Material in Ceramic Body Formulations, The 5th AUN/SEED-Net Regional Conference on Materials Engineering & The 5th Regional Conference on Natural Resources and Materials, 2013.01.
78. 笹木圭子, Mg系ジオミメティクスのホウ酸収着剤としての活用, 広島大学 サステイナブル科学セミナー, 2012.12, ホウ酸(H3BO3/B(OH)4-)は、医薬品・化粧品、ガラス、電気メッキなどの製造業からの排水や、地熱発電や排煙脱硫などにともなう副生排水にしばしば含まれ、ヒトの健康に影響があるとして、排出基準および環境基準が設けられている。また、pKa 9.23(25℃)の弱酸であるホウ酸は、大部分の自然環境において分子状として存在するために動的に振る舞い、安価な捕捉剤がほとんど得られていない。筆者らはMgを含む地球化学物質(ドロマイト、マグネサイト、ハイドロタルサイト)に着目し、その焼成物によりホウ酸の収着剤を平易に合成することを試みており、その反応機構、改変条件の最適化、再生性について、最近の研究成果を紹介する。.
79. Pilasinee LIMSUWAN, 熊谷 聡, Wiwut TANTHAPANICHAKOON, Keiko Sasaki, Tsuyoshi Hirajima, Plasma-Treated Activated Carbon for Enhancing Phenol Removal With Ozone in Three-Phase Fuidized-Bed Reactor , The 9th International Symposium on Novel Carbon Resource Sciences, 2012.11.
80. 熊谷 聡, Tsuyoshi Hirajima, Sho EGASHIRA, Nobuyuki HAYASHI, Enzymatic Saccharification of Cellulose in Kenaf Core Combined with Hot-Compressed Water, International Workshop on Process Intensification 2012, 2012.11.
81. 笹木圭子, Mg系ジオミメティクスの環境材料への活用, 資源・素材学会, 2012.09.
82. 熊谷 聡, 野中 壯泰, 平島 剛, 種々の前処理をおこなったモウソウチクの水熱炭化特性, 第44回化学工学会秋季大会, 2012.09.
83. 野中 壯泰, 平島 剛, 熊谷 聡, 笹木 圭子, 亜臨界・超臨界流体による低品位炭の改質および乾燥, 資源・素材学会秋季大会, 2012.09.
84. Dewi Agustina IRYANI, 熊谷 聡, Moriyasu Nonaka, Keiko Sasaki, Tsuyoshi Hirajima, Overview of Indonesian Sugarcane Industry and Utilization of Its Solid Waste, 資源・素材学会秋季大会, 2012.09.
85. Keiko Sasaki, Yukiho Hosomomi, Xinhong Qiu , Sorption of borate on calcined products of natural dolomite, Goldschmidt2012, 2012.06.
86. Keiko Sasaki, Yukiho Hosomomi, Xinhong Qiu, Tsuyoshi Hirajima , Sorption of borate on calcined products of natural dolomite: effect of calcination temperatures, Interface Against Pollution 2012, 2012.06.
87. 森優典, 平島 剛, 笹木 圭子, ヒマワン トリ バユ ムルテイ ペトラス, 澤田満, 砒素含有銅鉱石からの砒素鉱物の分離に関する研究 , 資源・素材学会九州支部大会, 2012.05.
88. 辻久也, 熊谷 聡, 野中 壯泰, 笹木 圭子, 平島 剛, 低石炭化度炭の水熱処理による改質及び改質炭の燃焼性の検討, 資源・素材学会九州支部大会, 2012.05.
89. 森岡恵美子, YU QIANQIAN, 笹木 圭子, 平島 剛, 酸化マンガン生体鉱物由来のリチウムイオンシーブの合成条件の最適化, 資源・素材学会春季大会, 2012.03.
90. 細樅侑貴穂, 平島 剛, 笹木 圭子, 森山紗好, 焼成ドロマイトを用いた水溶液中のホウ素の除去, 資源・素材学会春季大会, 2012.03.
91. 太屋岡篤憲, 桑田真之, 平島 剛, 笹木 圭子, 流量センサを用いた風力選別機の同定と制御, 資源・素材学会春季大会, 2012.03.
92. 野中 壯泰, 平島 剛, 笹木 圭子, 低品位炭前処理による性状変化, 資源・素材学会春季大会, 2012.03.
93. 桑田真之, 平島 剛, 笹木 圭子, 太屋岡篤憲, 乾式ふるい分けおよび風力分級による廃蛍光体中の希土類蛍光体の濃縮, 資源・素材学会春季大会, 2012.03.
94. Xinhong QIU, Sayo MORIYAMA, Keiko Sasaki, Tsuyoshi Hirajima, Effect of pH on Sorption of Borate on MgO, 資源・素材学会春季大会, 2012.03.
95. Dewi Agustina IRYANI, 熊谷 聡, 野中 壯泰, 笹木 圭子, Tsuyoshi Hirajima, Effect of Hydrothermal Treatment on Combustibility of Sugarcane Bagasse, 資源・素材学会春季大会, 2012.03.
96. 熊谷 聡, 野中 壯泰, 平島 剛, モウソウチクの水熱炭化過程における化学成分組成と平衡含水率の変化, 第7回バイオマス科学会議, 2012.01.
97. Keiko SASAKI, Modification of Geomimetics to Eco-materials, The 8th Internatinal Symposium on Novel Carbon Resource Sciences, 2011.12.
98. Keiko SASAKI, Koichiro TAKATSUGI, Tsuyoshi HIRAJIMA, Bioleaching of Cu from Enargite using Acidianus brierleyi with Concomitant Passivation of As, the 19th International Biohydrometallurgy Symposium, 2011.09.
99. QIANQIAN YU, KEIKO SASAKI, TSUYOSHI HIRAJIMA, KAZUYA TANAKA, TOSHIHIKO OHNUKI, Structural effects of Zn2+ on biogenic Mn oxides: EXAFS analysis of solid residues after concomitant immobilization, Goldschmidt2011, 2011.08.
100. Keiko SASAKI*, Shoichi TSURUYAMA, Sayo MORIYAMA, Yuko MISUMI, Tsuyoshi HIRAJIMA, Sorption of Sr2+ on hydroxyapatite from calcined fish bones
at different temperatures, Goldschmidt2011, 2011.08.
101. Sayo Moriyama*, Keiko Sasaki, Tsuyoshi Hirajima, Removal of fluoride on Mg–Al mixed oxides prepared at different temperatures, Goldschmidt2011, 2011.08.
102. Keiko SASAKI, Koichiro TAKATSUGI,Tsuyoshi HIRAJIMA, Some Approaches to Enhance the Bioleaching of Enargite, International Mineral Processing Congress 2010, 2010.09.
103. KEIKO SASAKI, QIANQIAN YU, TAKUYA KASEYAMA, TSUYOSHI HIRAJIMA, Sorption of heavy metals on biogenic birnessite in comparison with synthetic analogues, Goldschmodt 2010, 2010.06.
104. S. MORIYAMA, K. SASAKI, H. YOSHIZAKA, T. HIRAJIMA, Removalof borate with magnisium oxides prepared at different temperatures, Goldschmidt 2010, 2010.06.
105. JOE C. RENSHAW, STEPHANIE HANDLEY-SIDHU, SAYO MORIYAMA, KEIKO SASAKI, LYNNE MACASKIE, Microbial Biominerals: Role in Radionuclide Remediation, Goldschmidt 2010, 2010.06.
106. L. MACASKIE, K. SASAKI, Biogenic Hydroxyapatite: New Nanophase Material for Radiodionuclide Removal., Goldschmidt 2010, 2010.06, 微生物由来のハイドロキシアパタイトのナノ特性を利用した環境浄化材としての特徴と今後の展望に関してレビューしたものである。.
107. Qianqian YU, Takuya KASEYAMA, Keiko SASAKI, Tsuyoshi HIRAJIMA, Sorption characteristics of heavy metals on biogenic birnessite compared with synthetic analogues, the 6th Interface Against Pollution 2010, 2010.05.
108. 笹木 圭子, 高次晃一郎, 石倉和弘, 平島 剛, enargite (Cu3AsS4)及びtennantite (Cu12As4S13)の酸化pHによる表面化学状態の変化, 資源・素材学会九州支部会, 2009.05.
109. K. Sasaki1, H. Nakano, W. Wilopo, T. Hirajima, SPECIATION OF ARSENIC IN TREATMENT OF GROUNDWATERS SPIKED WITH ARSENITE USING PERMEABLE REACTIVE MATERIALS, the 5th Interface Against Pollution, 2008.06.
110. K. Sasaki, H. Takamori, H. Yoshizaka, T. Hirajima, SORPTION OF BORIC ACID ON MAGNESIUM OXIDE IN PERMEABLE REACTIVE BARRIERS, the 5th Interface Against Pollution, 2008.06.
特許出願・取得
特許出願件数  8件
特許登録件数  0件
その他の優れた研究業績
2019.02, PACCON 2019にて招待講演(Immobilization of iodine and selenium as radionuclide surrogates in cement related materials)
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2014.12, 第40回 資源・素材学会論文賞.
2011.03, 資源・素材学会「論文賞」受賞
北海道上ノ国人工湿地における重金属処理– 重金属の土壌への固定形態と土壌微生物の役割–.
2008.12, CINEST Best Paper Award.
2009.03, 資源・素材学会論文賞受賞.
2007.04, 単離株マンガン酸化真菌の遺伝子のデータをGenBankに登録
Phoma sp.(KY-1) AB303548
Paraconiothyrium sporulosum (WL-1) AB303549
Paraconiothyrium sp. (WL-2) AB303550.
1998.03, 資源・素材学会奨励賞受賞.
学会活動
所属学会名
Geochemical Society
日本ヒ素研究会
日本腐植物質学会
廃棄物学会
日本分析化学会
資源・素材学会
学協会役員等への就任
2015.10~2024.03, International Biohydrometallurgy Society, International Scientific Comittee Member.
2021.02~2022.01, 資源・素材学会, 理事.
2020.02~2021.01, 資源・素材学会, 理事.
2017.04~2020.03, 資源・素材学会 , バイオハイドロメタラジー研究委員会 委員長.
2018.02~2021.01, 資源・素材学会, 編集委員長.
2016.02~2019.01, 資源・素材学会, 評議員.
2016.04~2017.03, 資源・素材学会, 理事.
2015.03~2016.03, 資源・素材学会, 副会長.
2014.04~2015.03, 資源・素材学会, 九州支部 副支部長.
2014.04~2015.03, 資源・素材学会, 評議員.
2013.12~2014.12, 公益財団法人 国際科学技術財団, 日本国際賞 審査委員.
2011.02~2013.02, Frontiers in Bioleaching, Associate Editorial Board.
2010.09~2010.12, 資源・素材学会, 論文賞選考委員.
2010.08~2011.03, 資源・素材学会, 論文賞審査委員会.
2006.04, 資源・素材学会, 編集委員.
2004.04, 資源・素材学会, 常議員.
1999.04~2004.03, 日本分析化学会, 幹事.
2004.03, 資源・素材学会, 評議員.
学会大会・会議・シンポジウム等における役割
2019.07~2019.07.24, Goldschmidt 2019, 発表.
2019.06~2018.06.24, Euro Clay 2019, 発表.
2019.08~2019.08.24, ACS 2019 Fall, 発表.
2019.10.20~2019.10.23, International Biohydrometallurgy Symposium 2019, 実行委員長.
2018.09.10~2018.09.12, 資源・素材学会2018秋季大会, パネルディスカッションのパネラー.
2018.09.10~2018.09.12, 資源・素材学会2018秋季大会, パネルディスカッションの司会.
2017.09~2017.09.25, International Biohydrometallurgy Symposium 2017, International Scientific Committee Member.
2018.08~2018.08.24, Goldschmidt 2018, 発表.
2017.06~2017.06.24, Goldschmidt 2017, 発表.
2015.10.06~2015.10.08, International Biohydrometallurgy Symposium 2015 (IBS 2015), 座長(Chairmanship).
2013.03~2013.04.06, 資源・素材学会2013春季大会, 座長(Chairmanship).
2016.03~2016.03.24, Goldschmidt 2016, 発表.
2012.10~2013.04.06, 資源・素材学会2012秋季大会, 座長(Chairmanship).
2012.03~2013.04.06, 資源・素材学会2012春季大会, 座長(Chairmanship).
2011.09.26~2011.09.29, 資源・素材学会2011秋季大会, 座長(Chairmanship).
2010.12~2010.12.01, CINEST2010, 座長(Chairmanship).
2010.11~2010.11.01, GCOEシンポジウム, 座長(Chairmanship).
2010.09.13~2010.09.15, 資源・素材学会秋季大会, 座長(Chairmanship).
2009.12~2010.05.25, International Symposium on Earth Science and Technology 2009, 座長(Chairmanship).
2010.03~2010.05.25, 資源・素材学会春季大会, 座長(Chairmanship).
2008.12.01~2008.12.02, International Symposium on Earth Science and Technology 2008, 座長(Chairmanship).
2008.06, the 5th Interface Against Pollution, 実行委員.
2007.12, Proc.5th International Workshop on Earth Science and Technology, 座長(Chairmanship).
2007.03, 資源・素材学会春季大会, 座長(Chairmanship).
2004.09, 資源・素材学会秋季大会, 座長(Chairmanship).
2005.09, 資源・素材学会秋季大会, 座長(Chairmanship).
2006.09, 資源・素材学会秋季大会, 座長(Chairmanship).
2004.12, Proc. 2nd International Workshop on Earth Science and Technology, 座長(Chairmanship).
2005.12, Proc. 3rd International Workshop on Earth Science and Technology, 座長(Chairmanship).
2006.12, Proc. 4th International Workshop on Earth Science and Technology, 座長(Chairmanship).
2006.11, Intl. Symp. on Health Hazards of Arsenic Contamination of Groundwater and its Countermeasures, 座長(Chairmanship).
2006.03, 資源・素材学会, 座長(Chairmanship).
2005.03, 資源・素材学会, 座長(Chairmanship).
2004.09, 資源・素材学会, 座長(Chairmanship).
2017.03.06~2017.03.10, Hybrid Materials 2017, 講演者.
2016.12.09~2016.12.09, JSPS第69委員会, スピーカー.
2016.11.18~2016.11.20, Asian Clay 2016, 講演者.
2016.11~2016.11.27, Copper 2016, Speaker.
2015.11.30~2019.10.31, MICE, アンバサダー.
2015.06.12~2016.07.15, 13th International Conference on the Biogeochemistry and Trace Elements (ICOBTE 2015), 組織委員.
2015.10~2015.10.02, International Biohydrometallurgy Symposium 2015, International Advisory Committee Board Member.
2017.03~2017.03.27, Hybrid Materials 2017, Speaker.
2016.06.26~2016.07.01, Goldschmidt 2016, Invited speaker.
2015.10.06~2015.10.08, International BiohydrometallurgySymposium 2015 (IBS 2015), Chair person.
2015.09.08~2015.09.10, 資源・素材学会, 企画セッション責任者.
2015.03~2015.03.11, Hybride Materials 2015, Chair person.
2015.01.21~2015.01.23, IGO-2015, Chair persin, invited speaker.
2014.09.15~2014.09.19, 資源・素材学会 秋季大会, 企画セッション責任者.
2014.09.15~2014.09.19, 資源・素材学会, 実行委員.
2014.03.16~2014.03.20, 247th American Chemical Society (ACS), 招待講演.
2013.11.23~2013.11.25, 微生物生態学会, 招待講演.
2013.08~2013.08.03, Goldschmidt 2013, presentator.
2013.10.01~2013.10.06, IBS 2013, speaker.
2013.10.28~2013.11.01, ISIEM 2013, chair man, invited speaker.
2013.09.03~2013.09.05, MMIJ秋季大会, 企画責任者.
2013.05.18~2013.05.19, 分析化学討論会, 座長.
2011.11.05~2012.05.05, the 11th International Symposium on East Asian Resources Recycling Technology, Chair.
2012.03.26~2012.03.28, 資源・素材学会春季大会, 座長.
2011.05.05~2012.12.05, CINEST2011, Chair.
2010.12~2010.12.01, CINEST2010, 座長.
2010.11~2010.11.01, G-COEシンポジウム, 座長.
2010.09~2010.09.01, 資源・素材学会秋季大会, 座長.
2009.12~2009.12.18, CINEST, Chairman.
2008.12.01~2008.12.02, International Symposium on Earth Science and Technology 2008, Chairman.
2015.12.01~2015.12.06, International Workshop on Earth Science and Technology, 座長.
2008.06, the 5th International against pollution 2008, 実行委員.
2007.03, 資源・素材学会, 座長.
2006.12, The 4th International Workshop on Earth Science and Technology, Chairman.
2006.11, Intl. Symp. on Health Hazard by Arsenic Contamination of Groundwater and its Countermeasures, Chairman.
2006.09, 資源・素材学会, 実行委員.
2006.09, 資源・素材学会, 座長.
2006.03, 資源・素材学会, 座長.
2005.05, 日本分析化学討論会, 座長.
2005.03, 資源・素材学会春季大会, 司会.
2005.12, The 3rd International Workshop on Earth Science and Technology, Chairman.
2004.12, The 2nd International Workshop on Earth Science and Technology, Chairman.
2003.09, IBS-BIOMINE 2003, Chairman.
学会誌・雑誌・著書の編集への参加状況
2018.02~2021.01, Journal of MMIJ, 国内, 編集委員長.
2011.02~2013.02, Frontiers in Bioleaching, 国際, 編集委員.
2009.04~2014.03, グローバルCOE 新炭素資源学ジャーナル, 国内, 編集委員.
2006.04~2007.03, 土壌浄化ハンドブック, 国内, 編集委員.
2006.04, 資源・素材学会誌「資源と素材」, 国内, 編集委員.
2001.04~2002.03, 演習で学ぶ環境, 国内, 編集委員.
2002.04~2005.03, 新・水の分析, 国内, 編集委員.
学術論文等の審査
年度 外国語雑誌査読論文数 日本語雑誌査読論文数 国際会議録査読論文数 国内会議録査読論文数 合計
2019年度 22  10  33 
2018年度 20  10  31 
2017年度 25  29 
2016年度 30  33 
2015年度 23  28 
2014年度 21      22 
2013年度 26      27 
2012年度 10  15  30 
2011年度 12  10  26 
2010年度 10  27 
2009年度 25  15    43 
2008年度 18  28 
2007年度   10 
2006年度  
2005年度  
2004年度  
2003年度    
2002年度    
2001年度    
2000年度    
1999年度    
1998年度    
1997年度   10      10 
1996年度      
その他の研究活動
海外渡航状況, 海外での教育研究歴
ACS 2020 Fall, UnitedStatesofAmerica, 2020.08~2020.08.
Goldschmidt2020, UnitedStatesofAmerica, 2020.06~2020.06.
台北科技大学, Taiwan, 2019.11~2019.11.
Convention Center in San Diego , UnitedStatesofAmerica, 2019.08~2019.08.
ソルボンヌ大学, France, 2019.07~2019.07.
Pure and Applied Chemistry International Conference 2019 (PACCON 2019), Thailand, 2019.02~2019.02.
Boston Convention Center (Goldschmidt 2018), Pennsylvania State university, UnitedStatesofAmerica, 2018.08~2018.03.
Convention Center in New Orleans (ACS 2018 spring), UnitedStatesofAmerica, 2018.03~2018.03.
Pennsylvania State University, UnitedStatesofAmerica, 2017.11~2017.12.
International Convention Center Jeju (Asia Pacific ACS 2017), Korea, 2017.11~2017.11.
TU Bergakademie Freiberg (International Biohydrometallurgy Symposium 2017), Germany, 2017.09~2017.09.
Le Palais des Congrès de Paris (Goldschmidt 2017), France, 2017.08~2017.08.
Geoscience University of China, Wuhan Technical Institute, China, 2016.11~2016.11.
Copper 2016, Japan, 2016.11~2016.11.
Asian Clay 2016, China, 2016.11~2016.11.
Ghent University (18th International Conference of Heavy Metals in the Environments), Belgium, 2016.09~2016.09.
International Symposium of Biohydrometallurgy 2015 (invited speaker), Indonesia, 2015.10~2015.10.
EUROCLAY 2015, UnitedKingdom, 2015.07~2015.07.
Fourth International Conference on Multifunctional, Hybrid and Nanomaterials (Hybrid Materials 2015), Sitges, Spain, 2015.03~2015.03.
CSIR-NML (invited speaker), India, 2015.01~2015.01.
American Chemical Society 2014, Pennsylvania State University, UnitedStatesofAmerica, 2014.03~2014.03.
Chulalongkorn University, Department of Chemical Engineering, Department of Mining and Petroleum, Thailand, 2014.02~2014.02.
Rennes University I, ISEIM 2013, France, 2013.10~2013.10.
IBS 2013, Chile, 2013.10~2013.10.
Goldschmidt 2013, Italy, 2013.08~2013.04.
Bandung Technical Institute, Indonesia, 2013.03~2013.04.
Singapore National University, 三井化学シンガポール R&D, Singapore, 2013.01~2013.04.
University of Queensland, Australia, 2012.11~2012.11.
Pennsylvania State University, UnitedStatesofAmerica, 2012.06~2012.07.
Nancy Convention Center, France, 2012.06~2012.06.
Goldschmidt 2012, ペンシルバニア州立大学, Canada, UnitedStatesofAmerica, 2012.06~2012.06.
NIREE (Nagpur), India, 2011.12~2011.12.
Taipei University, Taiwan, 2011.10~2011.11.
Empark Grand Hotel in Changsha, China, 2011.09~2011.09.
Central South University, China, 2011.09~2011.09.
Rapland University, Finland, 2011.08~2011.08.
Prague Congress Center, CzechRepublic, 2011.08~2011.08.
延世大学, SouthKorea, 2011.06~2011.06.
University of Birmingham, UnitedKingdom, 2011.03~2011.03.
University of Wales, University of Birmingham, UnitedKingdom, UnitedKingdom, 2011.03~2011.03.
International Mineral Processing Congress 2010 in Brisbane, Australia, 2010.09~2010.09.
Goldschmidt 2010 in Knoxville, UnitedStatesofAmerica, 2010.06~2010.06.
Pennsynvania State University, University of Tennessee, UnitedStatesofAmerica, UnitedStatesofAmerica, 2010.06~2010.06.
Interface Against Pollution in Beijing, China, 2010.05~2010.05.
Curtine University, CSIRO, Australia, 2010.04~2010.04.
University of Birmingham, UnitedKingdom, 2010.03~2010.03.
Cambodia Technical Institute, Cambodia, 2010.02~2010.02.
上海交通大学, 華中農業大学, China, 2009.12~2009.12.
University of Birmingham, UnitedKingdom, 2009.11~2009.12.
International Boron Symposium in Eskisheir, Turkey, 2009.10~2009.10.
International Biohydrometallurgy Symposium in Bariloche, Argentina, 2009.09~2009.09.
Ohio State University, UnitedStatesofAmerica, 2009.09~2009.09.
Bandung Technical Institute, Indonesia, 2009.03~2009.03.
National Exposition in Salt Lake City (American Chemical Society), UnitedStatesofAmerica, 2009.03~2009.03.
University of British Columbia, Canada, 2008.07~2008.07.
Dechema, Germany, 2007.09~2007.09.
New Mexico Technical Institute, UnitedStatesofAmerica, 2007.02~2007.02.
University of Waterloo, New Mexio Technical Institute, Canada, UnitedStatesofAmerica, 2007.02~2007.02.
University of Waterloo, New Mexio Technical Institute, Canada, UnitedStatesofAmerica, 2006.10~2006.10.
Ohio State University, University of Waterloo, ETI, UnitedStatesofAmerica, Canada, 2006.10~2006.10.
IMPC, Turkey, 2006.09~2006.09.
BIOMINE, SouthAfrica, 2005.09~2005.09.
GQ-2004, Canada, 2004.07~2004.07.
University of Waterloo, Canada, 2003.03~2003.08.
University of Waterloo, Canada, 2002.09~2002.09.
EARTH-2001, Korea, 2001.10~2001.10.
IMPC-2000, Italy, 2000.09~2000.09.
IBS-99, Spain, 1999.06~1999.06.
Monashu University, Australia, 1997.08~1997.08.
外国人研究者等の受入れ状況
2020.08~2022.07, 1ヶ月以上, JSPS, China, 日本学術振興会.
2019.10~2019.10, 2週間未満, University of Cape Town , SouthAfrica, 日本学術振興会.
2019.10~2019.10, 2週間未満, University of Cape Town , SouthAfrica, 日本学術振興会.
2019.10~2019.10, 2週間未満, University of Cape Town , SouthAfrica, 日本学術振興会.
2019.10~2019.10, 2週間未満, University of Cape Town , SouthAfrica, 日本学術振興会.
2019.10~2019.10, 2週間未満, University of Cape Town , SouthAfrica, 日本学術振興会.
2019.10~2019.10, 2週間未満, University of Cape Town , SouthAfrica, 日本学術振興会.
2019.09~2019.10, 1ヶ月以上, University of South Australia, Ghana, University of South Australia.
2019.08~2019.08, JSPS, India.
2019.07~2019.07, 2週間未満, Curtin University, Australia, 学内資金.
2019.05~2019.05, 2週間未満, Penn State University, UnitedStatesofAmerica, 九州大学 Progress 100による招聘.
2019.10~2019.10, 2週間未満, University of Cape Town, SouthAfrica, 日本学術振興会.
2019.07~2019.08, 1ヶ月以上, 江西理工大学, China, 中国側の政府基金.
2019.07~2019.07, 2週間未満, Curtin University, Australia, 九州大学 アジア・オセアニア研究教育機構.
2019.06~2019.06, 2週間未満, Penn State University, UnitedStatesofAmerica, 九州大学 Progress 100による招聘.
2019.01~2019.01, 2週間未満, ペンシルバニア州立大学, UnitedStatesofAmerica, 日本学術振興会.
2018.11~2018.11, 2週間未満, University of Clermont Auvenrgne, France, France, .
2018.11~2018.11, 2週間未満, University of Clermont Auvenrgne, France, France, .
2018.11~2020.10, 1ヶ月以上, India, 日本学術振興会.
2018.11~2020.10, 1ヶ月以上, India, 日本学術振興会.
2018.11~2018.12, 2週間未満, 中国地質大学, China, 文部科学省.
2018.11~2018.12, 2週間未満, 中国地質大学, China, 文部科学省.
2018.11~2018.12, 2週間未満, 中国地質大学, China, 文部科学省.
2018.11~2018.12, 2週間未満, 中国地質大学, China, 文部科学省.
2017.04~2017.03, 1ヶ月以上, Indian Institute of Technology Madras, India, 日本学術振興会.
2017.03~2017.03, 2週間以上1ヶ月未満, Mahidol University, Thailand, 外国政府・外国研究機関・国際機関.
2016.09~2018.08, 1ヶ月以上, THE GANDHIGRAM RURAL INSTITUTE Deemed University, India, 日本学術振興会.
2015.11~2015.12, 2週間以上1ヶ月未満, Mahidol University, Thailand, 科学技術振興機構.
2016.03~2016.01, 2週間以上1ヶ月未満, Penn State Univ, UnitedStatesofAmerica, 文部科学省.
2016.02~2016.02, 2週間未満, School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Korea, Korea, 日本学術振興会.
2016.02~2016.02, 2週間未満, Virginia Poly Tech, UnitedStatesofAmerica, 文部科学省.
2016.01~2016.01, 2週間未満, University of Birmingham, UnitedKingdom, 文部科学省.
2016.01~2016.01, 2週間未満, Virginia Poly Tech, UnitedStatesofAmerica, 学内資金.
2015.10~2015.11, 2週間以上1ヶ月未満, Penn State University, UnitedStatesofAmerica, 学内資金.
2015.11~2017.10, 1ヶ月以上, JSPS, India, 日本学術振興会.
2015.07~2015.07, 2週間未満, Verginia Poly Tech, UnitedStatesofAmerica.
2015.10~2015.10, 2週間以上1ヶ月未満, Penn State University, UnitedStatesofAmerica, 日本学術振興会.
2015.06~2015.08, 1ヶ月以上, Verginia Poly Tech, UnitedStatesofAmerica, 外国政府・外国研究機関・国際機関.
2014.12~2015.02, 2週間未満, Pennsylvania State University, UnitedStatesofAmerica, 文部科学省.
2014.10~2016.03, 1ヶ月以上, Kyushu University, India, 文部科学省.
2014.09~2014.01, 1ヶ月以上, Pennsylvania State University, UnitedStatesofAmerica, 日本学術振興会.
2014.03~2014.03, 2週間以上1ヶ月未満, Pennsylvania State University, UnitedStatesofAmerica.
2013.10~2015.09, 1ヶ月以上, Yuzuncu Yil University, Turkey, 日本学術振興会.
2013.08~2013.09, 2週間未満, Murdoch University, Australia, 文部科学省.
2013.08~2013.09, 2週間未満, University of Qureensland, Australia, 文部科学省.
2013.08~2013.09, 2週間未満, Pennsylvania State University, UnitedStatesofAmerica, 文部科学省.
2013.01~2013.01, 2週間未満, バンドン工科大学, Indonesia, 文部科学省.
2012.10~2012.11, 2週間未満, University of Waterloo, Canada, 日本学術振興会.
2012.06~2012.06, 2週間未満, National Environmental Engineering Research Institute, India, 日本学術振興会.
2012.05~2012.05, 2週間未満, National Environmental Engineering Research Institute, India, 日本学術振興会.
2012.05~2012.05, 2週間未満, Hudson Resources Limited, Australia, 外国政府・外国研究機関・国際機関.
2012.03~2012.03, 2週間未満, University of Birmingham, UnitedKingdom, 外国政府・外国研究機関・国際機関.
2012.03~2012.03, 2週間未満, University of Birmingham, UnitedKingdom, 外国政府・外国研究機関・国際機関.
2011.12~2011.12, 2週間以上1ヶ月未満, Pennsylvania State University, UnitedStatesofAmerica, 日本学術振興会.
2011.05~2011.07, 1ヶ月以上, Ohio State University, UnitedStatesofAmerica, 日本学術振興会.
2010.11~2010.11, 2週間未満, Center for Environmental Risk Assessment and Remediation, Australia, 外国政府・外国研究機関・国際機関.
2010.04~2010.04, 2週間未満, University of Birmingham, UnitedKingdom, 外国政府・外国研究機関・国際機関.
2010.04~2010.04, 2週間未満, University of Birmingham, UnitedKingdom, 外国政府・外国研究機関・国際機関.
2009.04~2011.03, 1ヶ月以上, Prestina, 日本学術振興会.
2009.01~2009.02, 2週間未満, Ohio State University, UnitedStatesofAmerica, 日本学術振興会.
2008.05~2008.07, 1ヶ月以上, New Mexico Technical Institute, UnitedStatesofAmerica, 日本学術振興会.
2007.05~2007.05, 2週間未満, Indian Institute of Science , India, 政府関係機関.
2004.03~2004.03, 2週間以上1ヶ月未満, University of Waterloo, Canada, 日本学術振興会.
2001.11~2001.12, 1ヶ月以上, Ohio State University, UnitedStatesofAmerica, 民間・財団.
受賞
第16回JICA理事長表彰, 国際協力機構(JICA), 2020.10.
論文賞, 資源・素材学会, 2018.03.
日本国際賞審査委員, 国際科学事業財団, 2015.10.
第40回 資源・素材学会論文賞, 資源・素材学会, 2015.03.
平成25年度九州大学研究活動表彰, 九州大学, 2013.12.
平成24年度九州大学研究活動表彰, 九州大学, 2012.12.
平成23年度九州大学研究活動表彰, 九州大学, 2011.11.
論文賞, 資源・素材学会, 2011.03.
Best Paper Award 2010, CINEST, 2010.12.
Best Paper Award 2010, CINEST, 2010.12.
ポスター賞, 資源・素材学会, 2010.10.
Best Paper Award 2009, CINEST, 2009.12.
Best Paper Award 2009, CINEST, 2009.12.
MMIJ Kyushu Award, (社)資源・素材学会, 2009.05.
論文賞, 資源・素材学会, 2009.03.
Best paper award of International Symposium of Earth Science and Technology 2008, CINEST, 2008.12.
JSPS Bilateral Researcher Exchange Program 2003, JSPS, 2003.03.
奨励賞, 資源・素材学会, 1998.03.
研究資金
科学研究費補助金の採択状況(文部科学省、日本学術振興会)
2020年度~2022年度, 国際学術研究, 代表, 超難処理金鉱石のバイオハイドロメタラジー研究拠点の形成
(Advanced Research Network for Biohydrometallurgy of Double Refractory Gold Ore).
2019年度~2023年度, 国際共同研究強化(B), 代表, グラファイト質金鉱石のバイオハイドロメタラジーの学理.
2019年度~2020年度, 国際学術研究, 代表, 炭素質頁岩含有鉱石からの金属資源回収のためのバイオテクノロジー.
2019年度~2019年度, 研究成果公開促進費, 代表, 国際生物湿式冶金学シンポジウム.
2019年度~2021年度, 基盤研究(A), 代表, ジオミメティクスを活用した放射性核種の長期安定化への技術革新.
2019年度~2021年度, 特別研究員奨励費, 代表, MOF-derived carbons-based nanocomposites for degradation of organoarsenic compounds.
2018年度~2020年度, 特別研究員奨励費, 代表, Visible light driven photocatalyst for degradation of pharmaceutical wastewaters.
2018年度~2019年度, 挑戦的研究(萌芽), 代表, 炭素質頁岩の酵素分解を組み込んだゴールドバイオミネラルプロセッシングへの挑戦.
2017年度~2019年度, 特別研究員奨励費, 代表, 光触媒機能を付与した環境修復材の応用に向けた金属有機構造体・粘土鉱物複合体の合成.
2017年度~2019年度, 特別研究員奨励費, 代表, ナノ粒子Pdの形成場としての自己組織化イオン液体修飾酸化グラフェン複合体の合成.
2016年度~2018年度, 基盤研究(A), 代表, 放射性核種埋設に向けたジオミメティクスに由来する新規吸着材の開発.
2016年度~2018年度, 特別研究員奨励費, 代表, ヒ素およびフッ素除去のための機能性吸着剤の化学設計.
2016年度~2018年度, 特別研究員奨励費, 代表, 環境材料として機能化した層状複水酸化物ナノシートの合成.
2015年度~2017年度, 基盤研究(A), 分担, 高ヒ素含有銅鉱石ミネラルプロセシングのイノベーション.
2015年度~2017年度, 挑戦的萌芽研究, 代表, バイオテンプレートによるリチウムイオンシーブの合成と集積化.
2011年度~2013年度, 挑戦的萌芽研究, 代表, ヒ素耐性Biomining微生物の創製およびその資源工学的評価 (辞退).
2010年度~2012年度, 基盤研究(A), 代表, ナノジオサイエンスに基づく環境材料の探索と創出.
2009年度~2010年度, 萌芽研究, 分担, 微生物機能により合成されたマンガン酸化物に対するレアアース元素の選択吸着.
2009年度~2011年度, 基盤研究(A), 分担, 未利用炭素資源活用によるバイオコールエコ燃料製造システムの開発.
2008年度~2009年度, 萌芽研究, 代表, 鉄酸化細菌ヒ素耐性株によるバイオミネラルプロセッシングのイノベーション.
2009年度~2010年度, 特別研究員奨励費, 代表, 微生物処理による地下水浄化のための透過型浄化壁におけるヒ素の輸送モデル.
2007年度~2008年度, 萌芽研究, 分担, 透過型浄化壁における微生物群集構造の長期モニタリング.
2006年度~2008年度, 基盤研究(A), 分担, アジア圏におけるバイオコールコプロダクションシステムの開発.
2004年度~2007年度, 基盤研究(B), 代表, 生体鉱物の特性を生かした地下水・土壌汚染修復技術の新展開.
2001年度~2003年度, 基盤研究(A), 分担, アーバンマイン構築のための資源処理・リサイクル技術と環境保全技術の開発.
2000年度~2002年度, 基盤研究(B), 分担, 未利用低品位炭の改質によるエネルギー利用の効率化と環境負荷低減化.
2000年度~2002年度, 地域連携推進研究費, 分担, 廃蛍光管からの希土類元素の再資源化とその有効利用.
2004年度~2008年度, 基盤研究(A), 分担, 都市域における廃棄物再資源化拠点としてのアーバンマインの構築とそのホロニック・パス.
2000年度~2002年度, 基盤研究(C), 代表, バイオミネラリゼーションを活用した鉱廃水からのマンガン回収.
2001年度~2003年度, 基盤研究(B), 代表, 鉱廃水の生物処理に対する炭素材料の応用.
2004年度~2005年度, 萌芽研究, 代表, ヒ素汚染土壌のバイオレメディエーション.
2006年度~2007年度, 萌芽研究, 代表, 低酸素環境におけるマンガンのバイオミネラリゼーション.
科学研究費補助金の採択状況(文部科学省、日本学術振興会以外)
2009年度~2010年度, JOGMEC, 代表, 「湿式製錬技術開発事業に係る共同研究」表面分析による硫化銅鉱のバイオリーチングにおける不動態化の解明.
2009年度~2009年度, H21JSTシーズ発掘試験A(発掘型), 代表, 酸化マグネシウムの固体塩基特性と環境中の陰イオンとの反応機構.
2007年度~2007年度, JOGMEC, 代表, ヒ素含有銅鉱石対策技術共同研究.
日本学術振興会への採択状況(科学研究費補助金以外)
2019年度~2020年度, 二国間交流, 代表, Biotechnological approaches to facilitate metal recovery from refractory carbonaceous mineral ores.
2020年度~2020年度, 多国間交流, 代表, 超難処理金鉱石のバイオハイドロメタラジー研究拠点の形成.
2018年度~2018年度, 研究成果公開促進費, 代表, 国際バイオハイドロメタラジーシンポジウム.
2010年度~2013年度, 最先端・次世代研究開発支援プログラム, 代表, ジオミメティクスによる環境材料の創成.
2008年度~2008年度, 外国人招聘研究者事業, 代表, 透過型浄化壁による地下水中の有害陰イオンの除去.
2003年度~2003年度, 国際研究集会, 代表, Removal of Mn(II) ions by manganese-oxidizing fungus at neutral pHs in the presence of carbon fiber. .
2003年度~2003年度, 外国人招へい研究者(短期), 代表, 透過型反応活性バリアによる地下水汚染修復.
2001年度~2001年度, 国際研究集会, 代表, "Morphologies of aragonite synthesized from scallop shells and lime stones by successive reaction." EARTH-2001 (Kyongju).
2001年度~2001年度, 国際研究集会, 代表, "Bioaccumulation of manganese for water treatment with carbon fiber." IBS-2001 (Ouro Preto).
2000年度~2000年度, 国際研究集会, 代表, Water treatment of manganese-rich mine drainage by manganese-oxidizing bacteria at neutral pH." IMPC 2000 (Roma).
1999年度~1999年度, 国際学会等派遣事業, 代表, Bioremediation of mine drainage by manganese-oxidizing bacteria" IBS 99 (El Escorial).
競争的資金(受託研究を含む)の採択状況
2018年度~2020年度, 受託研究, 代表, 銅原料中の不純物低減技術開発事業.
2018年度~2018年度, 新井科学技術財団 特別枠, 代表, 酵素反応を利用した超難処理金鉱石のバイオミネラルプロセッシング.
2014年度~2014年度, 住友財団 環境研究, 代表, 層状鉱物の構造にもとづいた有機無機ナノコンポジットによる新規環境材料の開発.
2009年度~2009年度, クリタ水環境科学振興財団研究助成, 代表, 鉄粉を活性物質とした透過型浄化壁によるヒ酸・亜ヒ酸イオンの不動化反応のモデル化.
2009年度~2009年度, 大学発ベンチャー創出推進のための事業 (文部科学省), 代表, 酸化マグネシウムの固体塩基特性と環境中の陰イオンとの反応機構.
2008年度~2008年度, 産業技術研究助成事業 (経済産業省), 代表, 「湿式製錬技術開発事業に係る共同研究」表面分析による不動態化の解明.
2008年度~2008年度, 産業技術研究助成事業 (経済産業省), 代表, ヒ素含有坑廃水発生源対策調査研究.
2007年度~2007年度, JOGMEC共同研究, 代表, ヒ素含有銅鉱石対策技術研究.
2006年度~2006年度, NEDO, 代表, 北米における透過型浄化壁による地下水浄化技術の調査.
2005年度~2006年度, 鉄鋼業環境保全技術開発基金, 代表, 透過型浄化壁による地下水・土壌中のフッ素、重金属類汚染の修復.
2005年度~2005年度, 前田記念工学振興財団, 代表, 透過型浄化壁による地下水・土壌修復に関する研究.
2001年度~2001年度, ホクサイテック財団, 代表, 自然湿地における酸性鉱廃水の浄化機構に関する研究.
2000年度~2000年度, 産業技術研究助成事業 (経済産業省), 代表, 炭素材料を担体とした微生物によるマンガン資源濃集に関する研究.
1998年度~1998年度, 日本石灰石鉱業協会, 代表, ハイブリッド型軽質炭酸カルシウムの合成.
1998年度~1998年度, 昭和シェル石油科学研究振興財団, 代表, ホタテ貝殻再資源化のための技術開発.
1998年度~1998年度, 新井科学技術振興財団, 代表, バイオミネラリゼーションによる高濃度マンガン鉱廃水の処理および回収.
1998年度~1998年度, ホソカワ粉体工学振興財団, 代表, ホタテ貝殻から合成するアラゴナイトのファイン化と形状制御.
1998年度~1998年度, クリタ水・環境科学振興財団, 代表, Bioremediation of mine drainage by manganese-oxidizing bacteria.
1997年度~1997年度, ホクサイテック財団, 代表, マンガン酸化菌を含む土壌によるバイオレメディエーション.
1996年度~1996年度, 公益信託林女性自然科学者研究助成基金, 代表, 鉱山環境の土壌酸性化に対するバイオリメディエーション.
共同研究、受託研究(競争的資金を除く)の受入状況
2020.04~2021.03, 代表, グラファイト質金鉱石のバイオ処理.
2019.11~2021.03, 代表, 光触媒としての炭素量子ドット(Carbon Quantum Dot, CQD)複合体の研究.
2019.04~2021.03, 代表, Biotechnological approaches to facilitate metal recovery from refractory carbonaceous mineral ores.
2018.04~2020.03, 代表, 銅不純物低減技術に関する研究.
2017.04~2018.03, 代表, ハイドロキシアパタイトを用いた坑廃水中のほう酸除去.
2016.04~2017.03, 代表, アパタイト法による菱刈鉱山地熱水からのホウ酸除去.
2015.04~2016.03, 代表, 酸性鉱山廃水処理パッシブトリートメント.
2015.04~2016.03, 代表, 新官能基の探索.
2015.04~2016.03, 代表, ドロマイトの活用.
2011.04~2013.03, 代表, ドロマイトの環境浄化剤としての活用に関する研究.
2011.04~2013.03, 分担, 製錬工程における硫酸イオン共存下でのセレン酸イオンの分離.
2011.04~2013.03, 分担, 好熱性鉄酸化細菌を媒介としたヒ酸塩の生成 .
2010.04~2011.03, 代表, 製錬工程における硫酸イオン共存下でのセレン酸イオンの分離.
2010.04~2011.03, 代表, 好熱性鉄酸化細菌を媒介としたヒ酸塩の生成.
2009.09~2010.03, 代表, 表面分析による硫化銅鉱のバイオリーチングにおける不動態化の解明.
2009.07~2010.03, 代表, 酸化マグネシウムの固体塩基特性と環境中の陰イオンとの反応機構.
2008.10~2009.03, 代表, 湿式製錬技術開発事業に係る共同研究.
2008.10~2009.03, 代表, ヒ素含有坑廃水発生源対策調査研究.
2006.04~2009.03, 分担, バイオリーチングやバイオレメディエーションのプロセスで生ずる生体鉱物のキャラクタリゼーション.
2007.07~2008.02, 代表, ヒ素含有銅鉱石対策技術共同研究.
2003.08~2008.08, 分担, 透過型浄化壁によるセレン酸の不動化に関する研究.
2002.04~2005.03, 分担, 人工湿地の生態系を利用した酸性廃水処理技術の開発研究.
2000.06~2001.02, 代表, 炭素材料を担体とした微生物によるマンガン資源濃集に関する研究.
1999.04~2002.03, 分担, 鉱山廃水及び生活飲料水源からのマンガン除去技術の開発研究.
寄附金の受入状況
2020年度, 安藤ハザマ(株), 工学研究のため.
2019年度, (株)三菱マテリアル, 工学研究のため.
2019年度, (株)日本磁力選鉱, 工学研究のため.
2018年度, (株)三菱マテリアル, 工学研究のため.
2018年度, (株)安藤ハザマ, フライアッシュからの有害イオンの溶出抑制剤の検討.
2017年度, 新井科学技術振興財団, 酵素反応を利用した超難処理金鉱石のバイオミネラルプロセッシング.
2017年度, 三菱マテリアル(株), 工学研究のため.
2017年度, (株)安藤ハザマ, フライアッシュからの有害イオンの溶出抑制剤の検討.
2016年度, 三菱化学, 新規樹脂の評価.
2016年度, 三菱マテリアル, 鉱廃水のパッシブトリートメント.
2015年度, 三菱マテリアル, 鉱廃水のパッシブトリートメントに関する研究.
2015年度, 吉沢石灰, ドロマイトに由来する材料よる陰イオンの不動化機構.
2015年度, 三菱化学, 樹脂を用いた金属イオンの選択性の評価.
2014年度, 住友財団, 層状鉱物の構造にもとづいた有機無機ナノコンポジットによる新規環境材料の開発.
2014年度, 吉沢石灰工業(株), ドロマイトの環境浄化剤としての活用.
2014年度, 三菱マテリアル(株), 鉱廃水のパッシブトリートメントに関する研究.
2014年度, 三菱化学, 新官能基の探索.
2013年度, 吉沢石灰(株), ドロマイトの活用に関する研究.
2012年度, 吉沢石灰工業, ドロマイトの環境浄化剤としての活用に関する研究.
2011年度, 吉澤石灰工業(株), ドロマイトの活用に関する研究.
2009年度, クリタ水・環境科学振興財団, 鉄粉を活性物質とした透過型浄化壁によるヒ酸・亜ヒ酸イオンの不動化反応のモデル化.
2008年度, 栗田工業, 酸化マグネシウムによるフッ素吸着機構の解明.
2005年度, (財)鉄鋼業環境保全技術開発基金, 透過型浄化壁による地下水・土壌中のフッ素、重金属類汚染の修復.
2001年度, ホクサイテック財団, 自然湿地における酸性鉱廃水の浄化機構に関する研究.
2000年度, 金属鉱業事業団, 炭素材料を担体とした微生物によるマンガン資源濃集に関する研究.
1999年度, 日本石灰石鉱業協会, ハイブリッド型軽質炭酸カルシウムの合成.
1999年度, 昭和シェル石油科学研究振興財団, ホタテ貝殻再資源化のための技術開発.
1998年度, クリタ水・環境科学振興財団, Bioremediation of mine drainage by manganese-oxidizing bacteria.
1998年度, 新井科学技術振興財団, バイオミネラリゼーションによる高濃度マンガン鉱廃水の処理および回収.
1998年度, ホソカワ粉体工学振興財団, ホタテ貝殻から合成するアラゴナイトのファイン化と形状制御.
1998年度, ホクサイテック財団, マンガン酸化菌を含む土壌によるバイオレメディエーション.
1996年度, 公益信託林女性自然科学者研究助成基金, 鉱山環境の土壌酸性化に対するバイオリメディエーション.
1996年度, 新井科学技術振興財団, 植物系廃資源を利用した鉱山における酸性汚染水の発生防止と環境復元に関する研究.
学内資金・基金等への採択状況
2019年度~2021年度, Progress 100 戦略的パートナーシップ加速型, 代表, グリーンマテリアルの開発のための実験とDFTの融合研究 ~粘土鉱物を空間制御リアクターとした可視光触媒~.
2014年度~2015年度, 世界トップレベル研究者招へいプログラム Progress 100, 代表, 有機修飾粘土による新規環境材料の創出.
2010年度~2010年度, 平成22年度 工学研究院女性研究者支援(研究助成), 代表, ナノジオサイエンスにもとづく環境材料のデザイン.
2009年度~2009年度, 女性研究者支援事業, 代表, 分光化学計測法の地球科学試料への適用範囲の拡張.
2004年度~2004年度, 平成16年度工学部国際学術交流資金, 代表, 国際学会地下水水質GQ-2004における研究成果公表にともなう旅費.

九大関連コンテンツ

pure2017年10月2日から、「九州大学研究者情報」を補完するデータベースとして、Elsevier社の「Pure」による研究業績の公開を開始しました。
 
 
九州大学知的財産本部「九州大学Seeds集」