Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境水质学国家重点实验室

	Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation
	Zhang, Gaosheng ; Liu, Fudong ; Liu, Huijuan ; Qu, Jiuhui ; Liu, Ruiping
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	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
内容类型	期刊论文
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.