Carbon Electrode Modified by KOH Solution to Improve Performance of Capacitive Desalination
A carbon electrode was modified by different concentration of KOH solution to enhance the capacitive deionization performance.The hydrophilicity and electrochemical properties of the carbon electrode were characterized by FTIR analysis,contact angles test,cyclic voltammetry and impedance spectroscopy analysis,respectively.The results show that contact angles of the carbon electrode decrease from 115°to 62°with the increase of concentration of KOH,indicating the increase of hydrophilicity.The specific capacitance of carbon electrode achieves the maxium of 108.8Fg-1 modified by 5% KOH solution.Further,desalination experiments were carried out by lab-scale experimental system.The salt-removal efficiency of carbon electrode modified by KOH increases 23% under the conditions of 2.5v,initial concentration of 1500μs/cm,flow rate of 20ml/min.The capacitive deionization performance can be significantly improved by the modification of KOH,which is attributed to the hydroxyl functional group introduced to the surface of the carbon electrode and to increase the wetted surface.The carbon electrode modified by KOH solution has a great potential in capacitive deionization.
Capacitive deionization carbon electrode desalination KOH
Zhang Yingjie Li Cheng Guo Jia Li Ting
School of Chemical Engineering, Northeast Dianli University, P.O. Box 81, Jilin 132012, P.R. China
国际会议
2013青岛国际脱盐大会(Qingdao International Conference 2013 on Desalination and Water Reuse)
青岛
英文
250-255
2013-06-25（万方平台首次上网日期，不代表论文的发表时间）