改性活性碳毡电吸附污水中的Zn2+

用20%硝酸改性活性碳毡，利用扫描电镜和傅里叶红外光谱等技术对其改性后的结构进行了表征；利用改性活性碳毡作为吸附电极，进一步研究了其应用于电吸附的除盐效果和影响因素.结果表明，改性后的活性碳毡上的羰基和羧基增多，比表面积增大了32.2%，平均孔径提高了2.5%，微孔体积增大了23.1%.在电压为1.2V，pH值为6~8，极板间距为5mm时电吸附装置对水中Zn²⁺的吸附效果最优，动力学分析表明改性活性碳毡吸附Zn²⁺更符合准二级动力学方程，吸附等温线符合Langmuir等温吸附模型，除此以外，电吸附循环实验表明用20%硝酸为再生液，通过电极反接，改性活性碳毡的再生率> 74%，说明在电吸附Zn²⁺过程中改性活性碳毡具有良好的再生性.

Electrochemical adsorption of Zn2+ in wastewater by modified activated carbon felt

In this paper, the activated carbon felt was modified by 20% HNO₃ and its structure was characterized by SEM and FTIR. The modified active carbon felt was used as the adsorption electrode to study desalination effect and influencing factors further. The results showed that the carbonyl and carboxyl groups on active carbon felt increased, the specific surface area, the average pore size and the micropore volume enhanced by 32.2%, 2.5%, and 23.1%, respectively. The adsorption effect of Zn²⁺ was optimal in water when the voltage was 1.2V, pH was 6~8, and the electrode spacing was 5mm. The kinetic analysis showed that Zn²⁺ was adsorbed by modified activated carbon felt more closed to the quasi-two-stage kinetic equation, and the adsorption isotherms followed the Langmuir model. Moreover, the results of recycling experiment indicated that regeneration rate of modified activated carbon felt was more than 74% by using 20% HNO₃ as the regeneration solution. This explained that modified activated carbon felt had a good reproducibility in the adsorption process of Zn²⁺.