Removal of copper ions from wastewater by adsorption/electrosorption on modified activated carbon cloths
Removal of copper ions from wastewater by adsorption/electrosorption on modified activated carbon cloths
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通过改性活性炭布上的吸附/电吸附去除废水中的铜离子
DOI：
10.1016/j.jhazmat.2009.10.030
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发表时间：
2010-03-15
影响因子：
13.6
通讯作者：
Su, Yu-Jhih
中科院分区：
文献类型：
--
作者：
Huang, Chen-Chia;Su, Yu-Jhih
研究了不同改性活性碳纤维(ACF)布电极对废水中铜离子(Cu2+)的吸附和电吸附。采用硝酸改性和壳聚糖浸渍两种方法对市售聚丙烯腈基活性碳纤维布进行改性。采用氮气吸附-脱附等温线、Zeta电位、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和循环伏安等方法对改性前后的ACF的表面性能进行了表征。测定了无偏压和有偏压ACF布对Cu2+的吸附和电吸附量。并对其电吸附等温线进行了研究。将铜离子溶液的初始pH调整为4.0。实验结果表明，电吸附有效地提高了吸附容量。吸附/电吸附等温线符合Langmuir和Freundlich方程。0.3V时的平衡吸附容量为0.389 mmoL/g，是开路时的2倍。壳聚糖油浸渍ACF布对Cu2+的最大电吸附容量为0.854 mmoL/g，约为未浸渍ACF布的2.2倍。(C)2009爱思唯尔B.V.保留所有权利。
Adsorption and electrosorption of copper ions (Cu(2+)) from wastewater were investigated with variously modified activated carbon fiber (ACF) cloth electrodes. Commercial polyacrylonitrile-based ACF cloths were modified by nitric acid or impregnated with chitosan solution. The surface characteristics of ACFs before and after modification were evaluated by nitrogen adsorption-desorption isotherms, zeta potential, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry. Adsorption and electrosorption capacities of Cu(2+) on ACF cloths without and with a bias potential were measured. respectively, and the electrosorption isotherms were also investigated. The initial pH of the copper ion solution was adjusted to 4.0. Experimental results showed that electrosorption effectively increases adsorption capacity. The adsorption/electrosorption isotherms of Cu(2+) oil ACF cloths were in good agreement with Langmuir and Freundlich equations. The equilibrium adsorption capacity at 0.3V was 0.389 mmol/g, which is two times higher than that at open circuit. The maximum electrosorption capacity of Cu(2+) oil chitosan impregnated ACF cloths was 0.854 mmol/g, which is about 2.2 times higher than that on the pristine cloths. (C) 2009 Elsevier B.V. All rights reserved.