کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
575361 | 1453048 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electro-removal of arsenic(III) and arsenic(V) from aqueous solutions by capacitive deionization
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
The feasibility of the electro-removal of arsenate (As(V)) and arsenite (As(III)) from aqueous solutions via capacitive deionization was investigated. The effects of applied voltage (0.0-1.2 V) and initial concentration (0.1-200 mg Lâ1) on arsenic removal were examined. As evidenced, an enhancement of arsenic removal can be achieved by capacitive deionization. The capacity to remove As(V) at an initial concentration of 0.2 mg Lâ1 on the activated carbon electrode at 1.2 V was determined to be 2.47 Ã 10â2 mg gâ1, which is 1.8-fold higher than that of As(III) (1.37 Ã 10â2 mg gâ1). Notably, the possible transformation of arsenic species was further characterized. The higher effectiveness of As(V) removal via electrosorption at 1.2 V was attributed to the formation of an electrical double layer at the electrode/solution interface. The removal of As(III) could be achieved by the oxidation of As(III) to As(V) and subsequent electrosorption of the As(V) onto the electrode surface of the anode. The presence of sodium chloride or natural organic matter was found to considerably decrease arsenic removal. Single-pass electrosorption-desorption experiments conducted at 1.2 V further demonstrated that capacitive deionization is a potential means of effectively removing arsenic from aqueous solutions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 312, 15 July 2016, Pages 208-215
Journal: Journal of Hazardous Materials - Volume 312, 15 July 2016, Pages 208-215
نویسندگان
Chen-Shiuan Fan, Ssu-Chia Tseng, Kung-Cheh Li, Chia-Hung Hou,