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Sorption mechanism of chromate by ferrihydrite and sulfate green rust: comparison by XAFS analysis
http://hdl.handle.net/10458/6899
http://hdl.handle.net/10458/68992afc485e-8dd3-4609-ae41-2929ee72e785
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
本文 (1.5 MB)
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| Item type | その他 / Others(1) | |||||
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| 公開日 | 2020-06-22 | |||||
| タイトル | ||||||
| タイトル | Sorption mechanism of chromate by ferrihydrite and sulfate green rust: comparison by XAFS analysis | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | Chromate, ferrihydrite, green rust, XAFS, pH | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_1843 | |||||
| 資源タイプ | other | |||||
| 著者 |
Abdullah, Al Mamun
× Abdullah, Al Mamun× Onoguchi, Aina× Giuseppe, Granata× 所, 千晴 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Hexavalent chromium is toxic, carcinogenic and difficult to remove from wastewater due to its high mobility. In this work, we elucidated the sorption mechanism of chromate by ferrihydrite and two types of sulfate green rust; one prepared at pH 8.75 （GR8.75） and another one prepared at pH 7.50 （GR7.50）. We used XAFS analysis to investigate their behaviour by changing the Cr/Fe molar ratio and pH. The GR8.75 was found to be 1.7 times more efficient than GR7.50 and 6.7 times more efficient than ferrihydrite towards the chromate removal. XAFS indicated that ferrihydrite removed Cr（VI） via outer-sphere surface complexation at lower Cr/Fe ratios and via inner-sphere surface complexation at higher molar ratios. At higher molar ratios, bidentate binuclear Cr-Fe bonds were dominant and resulted in the expansion of the ferrihydrite structure. For lower molar ratio, both the GRs resulted into the formation of bidentate mononuclear Cr-Fe bonding like FeCr2O4 even at variable pH. The increase of Fe-Fe edge sharing and double corner sharing coordination numbers confirmed the surface-based redox reaction for GR8.75. On the contrary, the significant single corner sharing Fe-Fe coordination via oxygen might be the indication of the lateral insertion of Cr into GR7.50. | |||||
| 言語 | en | |||||
| 書誌情報 |
en : 5th International Arsenic Symposium in MIYAZAKI 2018 p. 86-89, 発行日 2018-06 |
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| 出版者 | ||||||
| 出版者 | University of Miyazaki, IRISH | |||||
| 言語 | en | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
