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

doi:10.1021/es501527c

	Respective Role of Fe and Mn Oxide Contents for Arsenic Sorption in Iron and Manganese Binary Oxide: An X-ray Absorption Spectroscopy Investigation
	Zhang, Gaosheng1,2 ; Liu, Fudong 3; Liu, Huijuan 1; Qu, Jiuhui 1; Liu, Ruiping 1; Liu, RP (reprint author), Chinese Acad Sci, Res Ctr Ecoenvironm Sci RCEES, State Key Lab Environm Aquat Chem, POB 2871, Beijing 100085, Peoples R China. liuruiping@rcees.ac.cn
发表期刊	ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN	0013-936X
	2014-09-02
卷号	48 期号:17 页码:10316-10322
关键词	Natural-waters Adsorption Oxidation Goethite Ferrihydrite Mechanism Removal As(Iii) Adsorbent Exafs
DOI	10.1021/es501527c
产权排序	[Zhang, Gaosheng; Liu, Huijuan; Qu, Jiuhui; Liu, Ruiping] Chinese Acad Sci, Res Ctr Ecoenvironm Sci RCEES, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China; [Zhang, Gaosheng] Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, Key Lab Coastal Zone Environm Proc, Yantai 264003, Shandong, Peoples R China; [Liu, Fudong] Chinese Acad Sci, Res Ctr Ecoenvironm Sci RCEES, Ctr Air Pollut Control Technol, Beijing 100085, Peoples R China
作者部门	中科院海岸带环境过程与生态修复重点实验室
英文摘要	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.; 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.
文章类型	Article
资助机构	Engineering ; Environmental Sciences & Ecology
收录类别	SCI
语种	英语
关键词[WOS]	NATURAL-WATERS ; ADSORPTION ; OXIDATION ; GOETHITE ; FERRIHYDRITE ; MECHANISM ; REMOVAL ; AS(III) ; ADSORBENT ; EXAFS
研究领域[WOS]	Engineering ; Environmental Sciences & Ecology
WOS记录号	WOS:000341229300046
引用统计	被引频次：197[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/8710
专题	中国科学院海岸带环境过程与生态修复重点实验室中国科学院海岸带环境过程与生态修复重点实验室_污染过程与控制实验室
通讯作者	Liu, RP (reprint author), Chinese Acad Sci, Res Ctr Ecoenvironm Sci RCEES, State Key Lab Environm Aquat Chem, POB 2871, Beijing 100085, Peoples R China. liuruiping@rcees.ac.cn
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci RCEES, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, Key Lab Coastal Zone Environm Proc, Yantai 264003, Shandong, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci RCEES, Ctr Air Pollut Control Technol, Beijing 100085, Peoples R China
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,&Liu, RP .(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.