电容去离子电极的污染特性研究  

STUDY ON POLLUTION CHARACTERISTICS OF CAPACITIVE DEIONIZING ELECTRODE

作　　者：施周[1] 张超[1] 杨灵芳 张秋华 SHI Zhou;ZHANG Chao;YANG Ling-fang;ZHANG Qiu-hua(College of Civil Engineering,Hunan University,Changsha 410082,China;Modern Engineering Training Center,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]湖南大学现代工程训练中心,长沙410082

出　　处：《环境工程》2018年第12期113-118,共6页Environmental Engineering

基　　金：湖南省自然科学基金(2018JJ3062);青年教师成长计划(531107040928)

摘　　要：活性碳纤维(ACF)电极的电容去离子技术(CDI)对水中离子具有良好的脱除效果,且经多次吸附脱附循环后电极仍具有良好的吸附性能和再生性能。当溶液中有苯甲酸、腐植酸和铜离子存在时,电极在长期运行的过程中会受到污染,离子去除率随着循环次数的增加而逐渐降低。通过扫描电子显微镜技术(SEM)、低温氮气吸附-脱附技术、循环伏安法(CV)、交流阻抗法(EIS)对电极污染特性进行测试及表征。结果表明:电极被不同污染物污染后,其电吸附性能呈不同的下降趋势,污染电极表面出现颗粒状和片状的有机污染和无机结垢;苯甲酸污染引起孔隙堵塞导致比表面积下降10.8%,腐植酸和铜离子对比表面积影响较小;电极受苯甲酸和腐植酸污染后,因比表面积减小而引起比电容降低;电极受铜离子污染后,有效吸附点位的减少使得比电容下降;电极被污染后,其表面或孔隙内污染物阻碍电子在纤维丝间的传递,电化学性能下降。The capacitive deionization (CDI)based on activated carbon fiber (ACF)electrodes has good removal effect on ions in water,and the electrodes still have good adsorption and regeneration performance after multiple adsorption and desorption cycles:When the benzoic acid,humic acid and the copper ions existed in the solution,the electrodes would be fouled during long-term operation,and the ion removal efficiency would decrease gradually with the increase of the number of cycles.The pollution characteristics of the electrode were tested and characterized by scanning electron microscope (SEM), nitrogen adsorption and desorption technology,cyclic voltammetry (CV)and electrochemical impedance spectroscopy (EIS.), and the results indicated that:after being polluted by different contaminants,the electro adsorption performance of electrodes declined in different trends,and granular and flaky organic pollution and inorganic scale were found on its surface;the benzoic acid incurred the plugging of pore,which resulted in reduction of the specific surface area by 10.8%,while the humic acid and copper ions had little effect on the specific surface area;after being polluted by the benzoic acid and the humic acid,the specific capacitance of the electrodes decreased due to'the decrease of the specific surface area;after being polluted "by the copper ions,the specific capacitance of the electrodes decreased due to the reduction of effective adsorption points ;after being polluted,electrochemical performance of electrode decreased,for the contaminants on the surface or in-the pores hindered the transfer of electrons between the fibers.

关 键 词：电容去离子 活性碳纤维电极 污染 苯甲酸 腐植酸 铜离子 

分 类 号：X703[环境科学与工程—环境工程]