Adsorption and transformation of thioarsenite at hematite/water interface under anaerobic condition in the presence of sulfide

doi:10.1016/j.chemosphere.2019.01.157

	Adsorption and transformation of thioarsenite at hematite/water interface under anaerobic condition in the presence of sulfide
	Wang, Ying 1,2; Lin, Jinru 1; Wang, Shaofeng 1; Zhang, Danni 1; Xiao, Fan 1,2; Wang, Xin 1; Jia, Yongfeng 1
刊名	CHEMOSPHERE
	2019-05-01
卷号	222 页码:422-430
关键词	Thioarsenite Hematite Reactions Oxidation Sulfidic environment
ISSN号	0045-6535
DOI	10.1016/j.chemosphere.2019.01.157
英文摘要	The adsorption behavior of thioarsenite (TAsIII) on the surface of hematite (alpha-Fe2O3) a is unknown at present. In the present study, we have investigated the transformation and reactions of TAsIII [mono-thioarsenite (MTAsIII) and dithioarsneite (DTAsIII)] on the surface of alpha-Fe2O3 in the presence of sulfide at S/As =1 and 3 by X-ray absorption spectroscopy (XAS) and Raman spectroscopy. The adsorption envelopes reveal that the adsorption of TAsIII on alpha-Fe2O3 is significantly less than that of arsenite (As-III) in the pH range from 7 to 11 with the initial As concentration of 25 mg L-1. However, at the initial As concentration of 135 mg L-1, the uptake of TAsIII by alpha-Fe2O3 is higher at pH 7 but lower at pH 8-11 than that of As-III. The adsorption isotherms show that the adsorption of As on alpha-Fe2O3 is largely inhibited by the presence of aqueous sulfide at pH 7 with low As equilibrium concentration (<40 mg L-1). Whereas the uptake of As by alpha-Fe2O3 is highly elevated compared with the value predicted by Langmuir model at pH 7 with high As equilibrium concentration (>40 mg L-1), implying the formation of As-bearing (surface) precipitate. The As and S K-edge XAS as well as Raman spectroscopy confirm the formation of As sulfide precipitate on the surface of alpha-Fe2O3 in MTAs(III )system. It is worth to note that the oxidation of (thio)-As-III occurs on the surface of alpha-Fe(2)O(3 )in DTAsIII system under strictly anaerobic conditions. These results shed new light on the understanding of the interfacial behavior of As and point to the potential implication in immobilization and removal of arsenic in sulfidic environment. (C) 2019 Elsevier Ltd. All rights reserved.
资助项目	National Key R&D program of China[2017YFD0800301] ; National Natural Science Foundation of China[41530643] ; National Natural Science Foundation of China[41877393] ; National Natural Science Foundation of China[41673130] ; National Natural Science Foundation of China[Y8SBR121SS] ; Chinese Academy of Sciences[QYZDJSSW-DQC038]
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000462109200049
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/123997]
专题	中国科学院沈阳应用生态研究所
通讯作者	Wang, Shaofeng; Jia, Yongfeng
作者单位	1.Chinese Acad Sci, Inst Appl Ecol, Key Lab Pollut Ecol & Environm Engn, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, Ying,Lin, Jinru,Wang, Shaofeng,et al. Adsorption and transformation of thioarsenite at hematite/water interface under anaerobic condition in the presence of sulfide[J]. CHEMOSPHERE,2019,222:422-430.
APA	Wang, Ying.,Lin, Jinru.,Wang, Shaofeng.,Zhang, Danni.,Xiao, Fan.,...&Jia, Yongfeng.(2019).Adsorption and transformation of thioarsenite at hematite/water interface under anaerobic condition in the presence of sulfide.CHEMOSPHERE,222,422-430.
MLA	Wang, Ying,et al."Adsorption and transformation of thioarsenite at hematite/water interface under anaerobic condition in the presence of sulfide".CHEMOSPHERE 222(2019):422-430.