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Adsorption and heterogeneous oxidation of As(III) on ferrihydrite

文献类型：期刊论文

作者Zhao, Zhixi1,2; Jia, Yongfeng1; Xu, Liying1; Zhao, Shanlin3
刊名WATER RESEARCH
出版日期2011-12-01
卷号45期号:19页码:6496-6504
关键词As(Iii) Ferrihydrite Adsorption Oxidation Catalysis
ISSN号0043-1354
DOI10.1016/j.watres.2011.09.051
英文摘要Redox transformation of arsenic strongly influences its fate and transport in the environment. It is of interest to investigate heterogeneous oxidation of As(III) on the surface of major metal oxide in sediments. whether As(III) can be oxidized on ferrihydrite and the role ferrihydrite plays as catalyst or oxidant are inconsistent in previous researches. In this work, oxidation of As(III) on ferrihydrite was studied by analysis of dissolved and adsorbed As(III) and As(V) quantitatively and qualitatively. X-ray absorption near edge spectroscopy (XANES) and pH(pznpc) (point of zero net proton charge) of ferrihydrite with adsorbed As(m) showed clear evidence for partial oxidation on ferrihydrite. Oxidation of As(III) occurred when it was brought to contact with ferrihydrite at high Fe/As molar ratio (i.e. 50, 200). The concentration of As(V) in solid phase increased gradually while adsorbed As(III) concentration dropped. Fe(II) was not detectable during the oxidation of As(III). These results showed that ferrihydrite had the catalytic effect on oxidation of As(III). Only a fraction of As(III) was oxidized even when the system was exposed to air. The effects of ferrihydrite aging, media pH, coexistence of ions on As(III) oxidation were also investigated. The results suggest that catalytic oxidation of As(III) on ferrihydrite may play a role in geochemical cycling of arsenic in environment. (C) 2011 Elsevier Ltd. All rights reserved.
WOS研究方向Engineering ; Environmental Sciences & Ecology ; Water Resources
语种英语
WOS记录号WOS:000297485600021
出版者PERGAMON-ELSEVIER SCIENCE LTD
源URL[http://210.72.129.5/handle/321005/121927]  
专题中国科学院沈阳应用生态研究所
通讯作者Jia, Yongfeng
作者单位1.Chinese Acad Sci, Inst Appl Ecol, Key Lab Pollut Ecol & Environm Engn, Shenyang 110016, Peoples R China
2.Xinjiang Normal Univ, Coll Chem & Chem Engn, Urumqi 830054, Peoples R China
3.Liaoning Shihua Univ, Fushun 113001, Liaoning, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Zhixi,Jia, Yongfeng,Xu, Liying,et al. Adsorption and heterogeneous oxidation of As(III) on ferrihydrite[J]. WATER RESEARCH,2011,45(19):6496-6504.
APA Zhao, Zhixi,Jia, Yongfeng,Xu, Liying,&Zhao, Shanlin.(2011).Adsorption and heterogeneous oxidation of As(III) on ferrihydrite.WATER RESEARCH,45(19),6496-6504.
MLA Zhao, Zhixi,et al."Adsorption and heterogeneous oxidation of As(III) on ferrihydrite".WATER RESEARCH 45.19(2011):6496-6504.

入库方式： OAI收割

来源：沈阳应用生态研究所

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