Ti/SnO2-Sb阳极-空气阴极电催化降解染料废水

摘要

为解决电化学法处理高盐染料废水存在的能耗大、成本高等问题,分别采用溶胶-凝胶法和辊压法制备Ti/SnO2-Sb阳极和空气阴极,构建了Ti/SnO2-Sb阳极-空气阴极双极体系(TSSA-ADC).甲基橙(MO)作为高盐染料废水的典型污染物,考察了电流强度、MO浓度、电解液浓度和初始pH对TSSA-ADC体系和TSSA单阳极体系降解MO的影响.结果表明:与TSSA单阳极体系相比,TSSA-ADC体系具有更好的抗有机负荷冲击、抗盐分冲击、抗酸碱波动能力,能够维护酸碱平衡防止硬度离子结垢.最佳反应条件为电流强度为0.030 A,电解液浓度为3％,MO浓度为100 mg/L,初始pH =6.以MO去除率达到98％为基准,TSSA-ADC体系比TSSA体系可节能74.26％.%Electrochemical technology for dye pollutant purification from high salinity wastewater are sufferring from high cost and energy consumption.To overcome these problems,a Ti/SnO2-Sb anode (TSSA)-air diffusion cathode (TSSA-ADC) system was established,where the anode was prepared by a sol-gel method and the air cathode was prepared by a roiling method.By using methyl orange (MO) as the target pollutant,the influence of the operational parameters,including current intensity,initial MO concentration,electrolyte concentration and initial pH,were investigated.The results showed that the TSSA-ADC system possessed higher resistivity to the fluctuation of organic load,salt,acid and alkali and had stronger ability in anti-scaling than the TSSA system.The optimal MO removal effect was obtained with 100 mg/L MO in 3％ NaCl solution at the current of 0.03A as well as initial pH value of 6.As to the MO removal efficiency of 98％,the energy consumption was reduced by 74.26％ in the TSSA-ADC system compared to the TSSA system.