Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions

doi:10.1016/j.chemgeo.2015.04.018

	Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions
	Jia, Yongfeng 2; Xiao, Fan 1,2; Wang, Shaofeng 2; Xu, Liying 2; Wang, Ying 1,2; Yuan, Zidan 1,2
刊名	CHEMICAL GEOLOGY
	2015-06-22
卷号	407 页码:46-53
关键词	Monothioarsenate As Transformation Xas Ftir Acid-catalyzed Reduction
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2015.04.018
英文摘要	Thioarsenates have been found to be major arsenic species in some sulfidic waters and their interactions with minerals play an important role in the geochemical cycling of arsenic. This work investigated the sorption behavior of monothioarsenate (mtAs(V)) on amorphous aluminum hydroxide (am-Al(OH)(3)) at various pHs and characterized the adsorbed arsenic by using X-ray absorption spectroscopy (XAS) and Fourier transform infrared spectroscopy (FTIR). The uptake of arsenic by am-Al(OH)(3) from mtAs(V) solution (86-16 mg.g(-1)) was found to be much less than that from arsenate (As-V) solution (112-50.5 mg.g(-1)) at all pHs applied (4-10). MtAs(V) was partly reduced to arsenite with concurrent production of elemental sulfur, and the interaction with am-Al(OH)(3) at acidic pH enhanced the reduction, which is attributed to acid-catalysis at the am-Al(OH)(3) surface. Transformation of mtAs(V) to arsenate also occurred during the adsorption process. The linear combination fitting (LCF) of As K-edge X-ray absorption near edge structure (XANES) spectra indicated that the arsenic adsorbed on am-Al(OH)(3) was present dominantly as mtAs(V), with minor amounts as arsenite and arsenate. The As K-edge extended X-ray absorption fine structure (EXAFS) and FTIR results suggested that bidentate binuclear complexation was involved in the adsorption of mtAs(V) on am-Al(OH)(3). This study is the first documentation of mtAs(V) sorption on aluminum hydroxides and is necessary to assess geochemical cycling of arsenic in sulfidic natural or mining-impacted environments. (C) 2015 Elsevier B.V. All rights reserved.
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000356234100005
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/122087]
专题	中国科学院沈阳应用生态研究所
通讯作者	Wang, Shaofeng
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Appl Ecol, Key Lab Pollut Ecol & Environm Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Jia, Yongfeng,Xiao, Fan,Wang, Shaofeng,et al. Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions[J]. CHEMICAL GEOLOGY,2015,407:46-53.
APA	Jia, Yongfeng,Xiao, Fan,Wang, Shaofeng,Xu, Liying,Wang, Ying,&Yuan, Zidan.(2015).Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions.CHEMICAL GEOLOGY,407,46-53.
MLA	Jia, Yongfeng,et al."Adsorption of monothioarsenate on amorphous aluminum hydroxide under anaerobic conditions".CHEMICAL GEOLOGY 407(2015):46-53.