电-Fenton氧化降解2,4-二氯酚

以气体扩散电极为阴极,以Ti/SnO₂-Sb₂O₅-IrO₂为阳极,构建了电-Fenton氧化系统降解水中2,4-DCP(2,4-二氯酚),在考察气体扩散阴极产生H₂O₂适宜电位基础上,研究了初始 c (Fe2+)和电化学反应时间对2,4-DCP降解的影响以及反应过程中 c (H₂O₂)、 c (Fe2+)和ρ(Cl-)的变化. 结果表明:该方法联合了电-Fenton氧化和钛基氧化物阳极氧化2种作用共同降解2,4-DCP,在阴极电位为-0.7 V、 c (Fe2+)为0.15 mmol/L、反应60 min时,2,4-DCP去除率为89.1%；反应120 min时,2,4-DCP的吸收特征峰完全消失,去除率达到100%；反应240 min时,ρ(TOC)降至9.15 mg/L,去除率达79.4%. 反应体系中ρ(H₂O₂)与ρ(Fe2+)呈负相关. 2,4-DCP被降解后,其苯环上的氯主要以Cl-的形式存在于溶液中. 

Degradation of 2,4-dichlorophenol by Electro-Fenton Oxidation Process

An electro-Fenton oxidation system using a gas diffusion electrode as the cathode and Ti/SnO2-Sb2O5-IrO2 as the anode was constructed and used for the degradation of 2,4-dichlorophenol(2,4-DCP).Based on an investigation of the optimal potential for the gas diffusion electrode to generate H2O2,the effects of Fe2+ and reaction time on the degradation of 2,4-DCP were studied.Moreover,the variations of H2O2,Fe2+ and Cl-concentrations during 2,4-DCP degradation were also investigated.The results showed that the degradation of 2,4-DCP was attributed to the co-action of electro-Fenton oxidation and anodic oxidation.Under the cathodic potential of-0.7 V,Fe2+ concentration of 0.15 mmol/L and reaction time of 60 minutes,89.1% of 2,4-DCP was removed.The characteristic absorption peak of 2,4-DCP disappeared completely,and the 2,4-DCP removal rate reached 100% after 120 minutes of treatment.TOC concentration was reduced to 9.15 mg/L,and its removal rate reached 79.4% after 240 minutes of treatment.There was a negative correlation between H2O2 and Fe2+.After degradation,the chlorine in the molecule of 2,4-DCP existed in the form of Cl-in the solution.