Comparative Study on Degradation of Acid Scarlet Wastewater with Ti/PbO2 Electrode and Ti/IrO2+Ta2O5 Electrode Catalytic Systems
In order to compare the effects of degradation of acid scarlet(GR)wastewater with Ti/PbO2 electrode and Ti/IrO2+Ta2 O5 electrode catalytic systems and determine the optimum process conditions,the effects of initial pH,initial dye concentration,current density and electrolyte concentration on the GR degradation rate in the Ti/PbO2 and Ti/IrO2+Ta2O5 electrode catalytic systems were explored,respectively.The GR degradation rate,electrode morphology and TOC removal rate in the two catalytic systems were compared after the process conditions were optimized.The results showed that under optimized process conditions(initial pH 6.38,initial dye concentration 100 mg/L,current density 50 mA/cm2 and electrolyte concentration 0.1 mg/L),the GR removal rates of the Ti/PbO2 electrode and the Ti/IrO2+Ta2O5 electrode could reach 98.3％and 61.1％,respectively,and the TOC removal rates were 25.4％and 13.5％.The analysis of the electrode surface morphology indicated that the surface of the Ti/IrO2+Ta2O5 electrode was obviously damaged,while there was little change in the surface of the Ti/PbO2 electrode.Therefore,the Ti/PbO2 electrode catalytic system has a higher GR degradation rate and TOC removal rate and excellent electrode stability.The results of this study provide a theoretical reference to promoting the application of electrocatalysis in dye wastewater treatment.
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