活性炭纤维阴极增强电-KMnO4去除水中双氯芬酸

Removal of diclofenac in solution by activated carbon fiber cathode enhanced electro-permanganate process

为考察单独活性炭纤维(ACF),高锰酸钾(PM),电化学(E),电-高锰酸钾(E-PM),活性炭纤维-高锰酸钾(ACF-PM)以及电-活性炭纤维阴极-高锰酸钾体系(E-ACF-PM)对水中双氯芬酸的降解效果,研究了电流强度,溶液初始pH值对E-ACF-PM体系去除水中双氯芬酸的影响,通过ACF表面形态分析,自由基捕获实验,络合反应等探索了E-ACF-PM体系的反应机理.结果表明,在E-ACF-PM体系中电化学(E-ACF)和PM之间有明显的协同作用,双氯芬酸被快速去除.随着电流强度增加(50-200mA),双氯芬酸去除率增大;pH值增大,体系对双氯芬酸的去除效果越差,pH值为11时去除率仅为31.70%.与ACF-PM体系相比,E-ACF-PM体系阴极电场可以保护ACF不被破坏,同时吸附在ACF上的Mn(Ⅶ)得到电子,快速转化成活性氧化剂Mn(Ⅲ),实现对目标污染物的快速去除.

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.