电场辅助活性炭吸附法去除水中的Cu2+

通过电场辅助活性炭吸附水中的Cu²⁺，分析吸附机理，pH值对Cu²⁺吸附的影响以及活性炭电极的再生性.结果表明，活性炭电极添加电场后，Cu²⁺的去除率明显提高，当活性炭电极间施加1.0V电压时，Cu²⁺的去除率提高了223.5%.通过Langmuir和Freundlich吸附等温线模型分析，添加电场后，活性炭电吸附Cu²⁺主要是带电活性炭表面形成的双电层作用，而不仅仅是活性炭表面化学吸附点位.pH值对电场辅助活性炭吸附水中Cu²⁺的影响极大，pH值太低时，水中H⁺会与Cu²⁺竞争活性炭表面化学吸附点位以及双电层点位.研究发现采用电极短接方式可提高Cu²⁺后的脱附率及脱附速率，脱附率达到79.1%.通过FTIR图谱可知，表面官能团-COOH和-C=O吸附的Cu²⁺难以脱附出来，但得益于此，再循环吸附-脱附2~4次时，主要以双电层静电吸附为主，脱附效率提高，电极的再生性良好.

Removal of Cu2+ from water by activated carbon under an assisted electrical field

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.