Removal of diclofenac in solution by activated carbon fiber cathode enhanced electro-permanganate process
ZHU Yun-hua1, ZHU Xuan-mo2, WANG Xu-xu1, ZHANG Xuan1, ZHENG Huai-li1, DENG Hui-ping3, ZHAO Chun1
1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Key Laboratory of the Three Gorges Reservoir Region's Environment, Ministry of Education, Chongqing University, Chongqing 400045, China;
2. Sichuan Institute of Land and Space Planning, Chengdu 610081, China;
3. Environmental Science and Engineering, Tongji University, Shanghai 200092, China
The removal of diclofenac (DCF) by activated carbon fiber (ACF), potassium permanganate (PM), electrolysis (E), E-PM, ACF-PM, and E-ACF-PM processes were studied. The influences of current intensity and initial pH value on the removal of DCF by E-ACF-PM process were investigated. The reaction mechanism of E-ACF-PM process for DCF removal was also explored by the analysis of ACF surface morphology, radical scavengers experiment and complex reaction. E-ACF and PM processes have an obvious synergistic effect. DCF could be rapidly removed in E-ACF-PM process. The removal of DCF increased with the increase of current intensity from 50 to 200 mA, and decreased significantly as the pH values ranged from acidic to alkaline conditions. Only 31.70% of DCF was removed in E-ACF-PM process at initial pH value of 11. ACF could be protected from destroyed by the cathode electric field in E-ACF-PM process compared with ACF-PM process, and the active oxidant-Mn(III) was generated though PM adsorbed on ACF cathode for the rapid degradation of DCF.
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