中国科学院机构知识库网格系统: Arsenate and cadmium co-adsorption and co-precipitation on goethite

Arsenate and cadmium co-adsorption and co-precipitation on goethite

文献类型：期刊论文

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作者	Jiang, W; Lv, JT; Luo, L; Yang, K; Lin, YF; Hu, FB; Zhang, J; Zhang, SZ; Zhang J(张静)
刊名	JOURNAL OF HAZARDOUS MATERIALS ; JOURNAL OF HAZARDOUS MATERIALS
出版日期	2013 ; 2013
卷号	262 页码:55-63
关键词	Arsenate Cadmium Goethite Adsorption Precipitation Arsenate Cadmium Goethite Adsorption Precipitation
ISSN号	0304-3894
DOI	10.1016/j.jhazmat.2013.08.030
英文摘要	Arsenate (As(V), AsO43-) and cadmium (Cd) are among the toxic elements of most concern. Their sorption behaviors on goethite were studied by batch experiments (pH edges, isotherms and kinetics) and X-ray diffraction (XRD). Arsenic coordination environment was explored by X-ray absorbance fine structure (EXAFS) analysis. Sorption isotherms of both As(V) and Cd on goethite could be divided into the adsorption-dominated and precipitation-dominated parts, while their sorption showed different pH-dependency and sorption reversibility. Cadmium adsorption was enhanced in the presence of AsO43-, which could be explained by the decrease in the electrostatic potential due to the sorption of AsO43- and the formation of a ternary Cd-As(V)-goethite complex. Based on the EXAFS study, AsO43- adsorbed on goethite mainly formed bidentate-binuclear complex. The high loadings of Cd changed the As(V)-Fe distance and its coordination number. However, Cd did not affect the As(V) adsorption amount in the adsorption-dominated region. When As(V) and Cd formed co-precipitates, their sorption amounts were both increased. The formation of co-precipitates decreased the mobility of Cd but increased the mobility of As(V) because less As(V) was sorbed on goethite through surface complexation. This study will provide better understandings on As(V) and Cd transport and useful information on their remediation strategies. (C) 2013 Elsevier B.V. All rights reserved.; Arsenate (As(V), AsO43-) and cadmium (Cd) are among the toxic elements of most concern. Their sorption behaviors on goethite were studied by batch experiments (pH edges, isotherms and kinetics) and X-ray diffraction (XRD). Arsenic coordination environment was explored by X-ray absorbance fine structure (EXAFS) analysis. Sorption isotherms of both As(V) and Cd on goethite could be divided into the adsorption-dominated and precipitation-dominated parts, while their sorption showed different pH-dependency and sorption reversibility. Cadmium adsorption was enhanced in the presence of AsO43-, which could be explained by the decrease in the electrostatic potential due to the sorption of AsO43- and the formation of a ternary Cd-As(V)-goethite complex. Based on the EXAFS study, AsO43- adsorbed on goethite mainly formed bidentate-binuclear complex. The high loadings of Cd changed the As(V)-Fe distance and its coordination number. However, Cd did not affect the As(V) adsorption amount in the adsorption-dominated region. When As(V) and Cd formed co-precipitates, their sorption amounts were both increased. The formation of co-precipitates decreased the mobility of Cd but increased the mobility of As(V) because less As(V) was sorbed on goethite through surface complexation. This study will provide better understandings on As(V) and Cd transport and useful information on their remediation strategies. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	Engineering; Environmental Sciences & Ecology ; Engineering; Environmental Sciences & Ecology
收录类别	SCI
电子版国际标准刊号	1873-3336
语种	英语
WOS记录号	WOS:000329595500008 ; WOS:000329595500008
公开日期	2016-05-03
源URL	[http://ir.ihep.ac.cn/handle/311005/223805]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Jiang, W,Lv, JT,Luo, L,et al. Arsenate and cadmium co-adsorption and co-precipitation on goethite, Arsenate and cadmium co-adsorption and co-precipitation on goethite[J]. JOURNAL OF HAZARDOUS MATERIALS, JOURNAL OF HAZARDOUS MATERIALS,2013, 2013,262, 262:55-63, 55-63.
APA	Jiang, W.,Lv, JT.,Luo, L.,Yang, K.,Lin, YF.,...&张静.(2013).Arsenate and cadmium co-adsorption and co-precipitation on goethite.JOURNAL OF HAZARDOUS MATERIALS,262,55-63.
MLA	Jiang, W,et al."Arsenate and cadmium co-adsorption and co-precipitation on goethite".JOURNAL OF HAZARDOUS MATERIALS 262(2013):55-63.

入库方式： OAI收割

来源：高能物理研究所

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