کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
577186 | 1453097 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Arsenate and cadmium co-adsorption and co-precipitation on goethite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
Arsenate (As(V), AsO43â) 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 AsO43â, which could be explained by the decrease in the electrostatic potential due to the sorption of AsO43â and the formation of a ternary Cd-As(V)-goethite complex. Based on the EXAFS study, AsO43â 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 262, 15 November 2013, Pages 55-63
Journal: Journal of Hazardous Materials - Volume 262, 15 November 2013, Pages 55-63
نویسندگان
Wei Jiang, Jitao Lv, Lei Luo, Kun Yang, Yongfeng Lin, Fanbao Hu, Jing Zhang, Shuzhen Zhang,