Electrochemical removal of chromium from aqueous solutions using electrodes of stainless steel nets coated with single wall carbon nanotubes
Electrochemical removal of chromium from aqueous solutions using electrodes of stainless steel nets coated with single wall carbon nanotubes
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DOI：
10.1016/j.jhazmat.2010.11.025
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发表时间：
2011-02-15
影响因子：
13.6
通讯作者：
Ouyang, Tong
中科院分区：
文献类型：
--
作者：
Liu, Yao-Xing;Yuan, Dong-Xing;Ouyang, Tong
采用一种电化学技术在实验室规模下研究从水溶液中去除六价铬（Cr(VI)）物种和总铬（TCr）。以涂覆有单壁碳纳米管的不锈钢网电极（SWCNTs@SSNE）作为阳极和阴极。研究了溶液pH值、电压和电解质浓度这三个参数，以探寻铬去除的最佳条件。发现最佳参数为pH值4、电压2.5V和电解质浓度10mg/L。在这些条件下，Cr(VI)和TCr的去除率与电极上涂覆的单壁碳纳米管的量高度相关，回归方程的系数分别为0.953和0.928。还对Cr(VI)的去除机理进行了研究。X射线光电子能谱（XPS）研究和扫描电子显微镜（SEM）图像表明，铬的去除过程包括在阴极将Cr(VI)还原为Cr(III)，然后阴极上的单壁碳纳米管吸附Cr(III)。研究结果表明，所提出的方法为从水溶液中去除铬物种，尤其是在酸性条件下去除Cr(VI)，提供了一种有趣的途径。（c）2010爱思唯尔出版社。保留所有权利。
An electrochemical technique was adopted to investigate the removal of Cr(VI) species and total chromium (TCr) from aqueous solution at a laboratory scale. The electrodes of stainless steel nets (SSNE) coated with single wall carbon nanotubes (SWCNTs@SSNE) were used as both anode and cathode. Three parameters, including solution pH, voltage and electrolyte concentration, were studied to explore the optimal condition of chromium removal. The optimal parameters were found to be pH 4, voltage 2.5V and electrolyte concentration 10 mg/L Under these conditions, the Cr(VI) and TCr removal had a high correlation with the amount of SWCNTs coated on the electrodes, with coefficients of the regression equations 0.953 and 0.928, respectively. The mechanism of Cr(VI) removal was also investigated. X-ray photoelectron spectroscopy (XPS) study and scanning electron microscope (SEM) picture showed that the process of chromium removal involved the reduction of Cr(VI) to Cr(III) on the cathode, and then the adsorption of Cr(III) by SWCNTs on the cathode. The study results indicated that the proposed method provided an interesting means to remove chromium species from aqueous solution, especially Cr(VI) in acidic condition. (c) 2010 Elsevier B.V. All rights reserved.