Co-adsorption of arsenite and arsenate on mixed-valence Fe(II,III) (hydr) oxides under reducing conditions

doi:10.1016/j.apgeochem.2018.10.015

	Co-adsorption of arsenite and arsenate on mixed-valence Fe(II,III) (hydr) oxides under reducing conditions
	Lei, Lei 1,2; Zhang, Guoqing 1,2; Lin, Jinru 1; Wang, Xin 1; Wang, Shaofeng 1; Jia, Yongfeng 1
刊名	APPLIED GEOCHEMISTRY
	2018-11-01
卷号	98 页码:418-425
关键词	Arsenite Arsenate Mixed-valence Fe(II,III)-(hydr)oxides Co-adsorption
ISSN号	0883-2927
DOI	10.1016/j.apgeochem.2018.10.015
英文摘要	The reduction of Fe(III) in iron hydroxides plays a significant role in the geochemical cycling of arsenic. However, the adsorption behavior of arsenic (As) at mixed-valence Fe(II,III) (hydr)oxides/water interface remains unclear. This work presents the kinetics, isotherms, and pH edge of arsenite (As(III)) and arsenate (As(V)) co-adsorption on the surface of Fe(II,III) (hydr)oxides as a function of Fe(II)/Fe(III) molar ratio and pH under anoxic environment. The XRD and Raman results indicated that by using Fe(II) and Fe(III) mixed solution as precursors, the coprecipitated products at pH 9 possibly were the mixture of ferrihydrite, goethite, magnetite and green rust, leading to a significantly smaller surface area than ferrihydrite. The adsorption of both As(III) and As(V) decreased significantly as the Fe(II)/Fe(III) molar ratio in the synthetic Fe(II,III) (hydr)oxides increased from 0 to 4. The adsorption of both As(III) and As(V) on the Fe(II,III) (hydr)oxides was strongly pH-dependent and showed completely opposite trends. As(V) was more easily adsorbed on the Fe(II,III) (hydr)oxides under acidic conditions, whereas an increasing amount of As (III) was adsorbed on Fe (hydr)oxides under alkaline conditions, possibly due to the competitive adsorption. Our findings may contribute to the understanding of the interfacial behavior of arsenic in the reducing environments.
资助项目	National Natural Science Foundation of China[41530643] ; National Natural Science Foundation of China[41877393] ; Hundred-Talent Program of Chinese Academy of Sciences[Y8SBR121SS] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB14020203]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000450301100038
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/123725]
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.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	Lei, Lei,Zhang, Guoqing,Lin, Jinru,et al. Co-adsorption of arsenite and arsenate on mixed-valence Fe(II,III) (hydr) oxides under reducing conditions[J]. APPLIED GEOCHEMISTRY,2018,98:418-425.
APA	Lei, Lei,Zhang, Guoqing,Lin, Jinru,Wang, Xin,Wang, Shaofeng,&Jia, Yongfeng.(2018).Co-adsorption of arsenite and arsenate on mixed-valence Fe(II,III) (hydr) oxides under reducing conditions.APPLIED GEOCHEMISTRY,98,418-425.
MLA	Lei, Lei,et al."Co-adsorption of arsenite and arsenate on mixed-valence Fe(II,III) (hydr) oxides under reducing conditions".APPLIED GEOCHEMISTRY 98(2018):418-425.