电催化氧化有机污染物的电极性能评估策略

Strategy forevaluation of electrode performancesin electrocatalytic oxidation of organic pollutants.

本研究采用电化学测试和亚甲基蓝(MB)模拟废水处理两种手段评估了填充床电极反应器电催化氧化有机污染物的电极性能.循环伏安(CV)和电化学阻抗谱(EIS)拟合结果表明,填充床体系的电极面积是PbO2/Ti阳极面积的1.54倍(即床层拓展系数λ为0.54),PbO2/Ti阳极(γ)和活性炭复极化粒子电极(β)用于MB氧化的有效电流占比分别为0.63、0.34;采用废水处理结果拟合所得的λ和γ+β为0.54和0.99,所得数值与前者相符,两种方式得以相互验证.对体系能耗和电流效率的回归分析及F检验结果证明了所构建评估策略的准确性,可为填充床体系电极性能评估提供理论与方法支撑.

The electrode performances of a packed-bed electrode reactor(PBER)were evaluated through electrochemical measurements containing cyclic voltammetry(CV)and electrochemical impendence spectra(EIS)and methylene Blue(MB)wastewater treatment.The CV and EIS results implied that the electrode area of the PBER was 1.54 times than that of the PbO2/Ti anode,indicating the bed expansion coefficientλwas 0.54.Furthermore,the effective current ratio of PbO2/Ti anode(γ)and activated carbon particle electrode(β)during the MB oxidation were 0.63 and 0.34,respectively.As a comparison,the values of parametersλand the sum ofγandβobtained from MB oxidation experiments were 0.54 and 0.99,which were in accordance with those of the CV and EIS tests.The accuracy of the proposed methods was further validated by using the energy consumption and current efficiency in MB oxidation via the regressive analysis and F test.This work provided a theoretical and feasible tool for evaluating particle electrode performance of a packed-bed electrode system.