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論文

In situ X-ray diffraction investigation of the evolution of a nanocrystalline lithium-ion sieve from biogenic manganese oxide

Yu, Q.; 笹木圭子*

Hydrometallurgy, 150, p.253 - 258, 2014/12

https://doi.org/10.1016/j.hydromet.2014.07.002

被引用回数：9 パーセンタイル：39.54(Metallurgy & Metallurgical Engineering)

Microbial catalysis, a primary pathway for the generation of Mn oxides in most natural environments, provides potential to fabricate new materials. A microtube-type lithium manganese oxide (LMO-MT) was synthesized through a solid-state transformation using Mn-oxidizing fungus, Paraconiothyrium sp. WL-2. Compared with abiotic precursors, the lithium-ion sieve microtube (HMO-MT) showed better performance for Li+ recovery. In order to clarify the formation process of LMO-MTs, in situ high-temperature X-ray diffraction was used to compare with three synthetic references. The effects of calcination temperature on crystal phase, composition, particle size and lattice parameters of the LMO-MTs were systematically discussed. It was found that the poorly crystalline structure of biogenic precursor as well as high content of organic matter facilitated the formation of highly crystalline LMO-MTs at low temperature. The unique structural properties of LMO-MTs, including high crystallinity and small lattice constant, are attributed to the high Li $^{+}$ sorption capacity of HMO-MTs.

論文

Adsorption characteristics of Cs $^{+}$ on biogenic birnessite

笹木圭子*; Yu, Q.; 桃木大地*; 忰山卓也*

Applied Clay Science, 101, p.23 - 29, 2014/11

https://doi.org/10.1016/j.clay.2014.06.028

被引用回数：14 パーセンタイル：40.60(Chemistry, Physical)

Adsorption of Cs $^{+}$ on biogenic birnessite was investigated and compared with (ad)sorption of other heavy metals and also with (ad)sorption on chemically synthesized birnessite. The adsorption density of Cs $^{+}$ on biogenic birnessite was smaller than that on chemically synthesized birnessite; however, the (ad)sorption densities of Co $^{2+}$ and Ni $^{2+}$ on biogenic birnessite were larger than on chemically synthesized birnessite. These phenomena can be interpreted by considering the distinctive nano-structure of biogenic birnessite, which is not only poorly crystalline and includes organic matter but also according to EXAFS contains a greater proportion of vacant central metal sites than is found in synthetic birnessite. Adsorbed Cs $^{+}$ ions on both birnessites were mainly in the form of outer sphere complexes, which cannot easily occupy vacant central metal sites in biogenic birnessite. Biogenic birnessite has a greater specific surface area and more fine pores than synthetic birnessite, but these factors do not necessarily lead to more adsorption sites for Cs $^{+}$ ions.

論文

Cobalt(II) oxidation by biogenic Mn oxide produced by sp. strain NGY-1

田中万也*; Yu, Q.; 笹木圭子*; 大貫敏彦

Geomicrobiology Journal, 30(10), p.874 - 885, 2013/08

https://doi.org/10.1080/01490451.2013.791352

被引用回数：20 パーセンタイル：48.06(Environmental Sciences)

生物起源のMn酸化物への2価Coの収着挙動を調べた結果、生物起源Mn酸化物への収着は無機合成Mn酸化物への速度よりも遅かった。2価Coの生物起源及び無機合成Mn酸化物への収着は3価Coへの酸化収着であった。両者の違いの原因は構造の違い及び共存イオンの違いに起因すると考えられる。

論文

Zinc sorption during bio-oxidation and precipitation of manganese modifies the layer stacking of biogenic birnessite

Yu, Q.; 笹木圭子*; 田中万也*; 大貫敏彦; 平島剛*

Geomicrobiology Journal, 30(9), p.829 - 839, 2013/07

https://doi.org/10.1080/01490451.2013.774075

被引用回数：38 パーセンタイル：71.33(Environmental Sciences)

真菌により生成するMn酸化物の生成過程におけるZnイオンの影響を調べた結果、生成したMn酸化物はバーネサイトであった。バーネサイトの構造をXAFS等により調べたところ、Zn濃度に依存してMn酸化物の積層構造が変化した。ZnのMn酸化物への収着様式により生成するMn酸化物の積層が変化したと考えられる。

論文