Abstract:Adsorption of Cu2+ from water by activated carbon under an assisted electrical field had been researched, including the adsorption mechanism, influence of pH value and the regeneration of the activated carbon electrodes. The results showed that the removal rate of Cu2+increased significantly after adding electric field. When the voltage between the active carbon electrodes was 1.0V, the removal rate of Cu2+ increased 223.5%. According to the analysis of Langmuir and Freundlich isotherm models, the adsorption of Cu2+ on the activated carbon electrode mainly depended on the double electric layer formed on the surface of the activated carbon, not only the chemical adsorption points on surface of the activated carbon. pH value had a great influence on the adsorption of Cu2+ by activated carbon. When pH value was too low, H+ and Cu2+ in water competed for the points of chemical adsorption and double electric layer on the surface of activated carbon. It was found that short circuit of the electrodes can improve the degree of desorption and desorption rate of Cu2+, and the degree of desorption of Cu2+ was 79.1%. It can be seen from FTIR that Cu2+ adsorbed by surface functional groups of carboxyl and carbonyl was difficult to be desorbed. When the cycle of adsorption-desorption was 2-4times, the electrostatic adsorption of double layers was the dominated modes, which improved the desorption rate and the regeneration of electrodes.
高新源, 李爱民, 刘佩春, 李阳, 宋海鸥, 刘玉斌, 战树岩. 电场辅助活性炭吸附法去除水中的Cu2+[J]. 中国环境科学, 2021, 41(2): 677-683.
GAO Xin-yuan, LI Ai-min, LIU Pei-chun, LI Yang, SONG Hai-ou, LIU Yu-bin, ZHAN Shu-yan. Removal of Cu2+ from water by activated carbon under an assisted electrical field. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 677-683.
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