Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation
文献类型：期刊论文
| 作者 | Zhang, Gaosheng ; Liu, Fudong ; Liu, Huijuan ; Qu, Jiuhui ; Liu, Ruiping |
| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2014 |
| 卷号 | 48期号:17页码:10316-10322 |
| ISSN号 | 0013-936X |
| 中文摘要 | In our previous studies, a synthesized Fe-Mn binary oxide was found to be very effective for both As(V) and As(III) removal in aqueous phase, because As(III) could be easily oxidized to As(V). As(III) oxidation and As(V) sorption by the Fe-Mn binary oxide may also play an important role in the natural cycling of As, because of its common occurrence in the environment. In the present study, the respective role of Fe and Mn contents present in the Fe-Mn binary oxide on As(III) removal was investigated via a direct in situ determination of arsenic speciation using X-ray absorption spectroscopy. X-ray absorption near edge structure results indicate that Mn atoms exist in a mixed valence state of +3 and +4 and further confirm that MnOx (1.5 < x < 2) content is mainly responsible for oxidizing As(III) to As(V) through a two-step pathway [reduction of Mn(IV) to Mn(III) and subsequent Mn(III) to Mn(II)] and FeOOH content is dominant for adsorbing the formed As(V). No significant As(III) oxidation by pure FeOOH had been observed during its sorption, when the system was exposed to air. The extended X-ray absorption fine structure results reveal that the As surface complex on both the As(V)- and As(III)-treated sample surfaces is an inner-sphere bidentate binuclear corner-sharing complex with an As-M (M = Fe or Mn) interatomic distance of 3.22-3.24 angstrom. In addition, the MnOx and FeOOH contents exist only as a mixture, and no solid solution is formed. Because of its high effectiveness, low cost, and environmental friendliness, the Fe-Mn binary oxide would play a beneficial role as both an efficient oxidant of As(III) and a sorbent for As(V) in drinking water treatment and environmental remediation. |
| WOS记录号 | WOS:000341229300046 |
| 公开日期 | 2015-03-26 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/9599]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 生态环境研究中心_大气污染控制中心 |
| 推荐引用方式 GB/T 7714 | Zhang, Gaosheng,Liu, Fudong,Liu, Huijuan,et al. Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2014,48(17):10316-10322. |
| APA | Zhang, Gaosheng,Liu, Fudong,Liu, Huijuan,Qu, Jiuhui,&Liu, Ruiping.(2014).Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation.ENVIRONMENTAL SCIENCE & TECHNOLOGY,48(17),10316-10322. |
| MLA | Zhang, Gaosheng,et al."Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation".ENVIRONMENTAL SCIENCE & TECHNOLOGY 48.17(2014):10316-10322. |
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来源：生态环境研究中心
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