Electrochemical Oxidation Degradation of Methyl Orange Wastewater by Nb/PbO₂ Electrode

摘要

Nb/PbO2 electrode was prepared through electrodeposition method and used as anode in the reactionof electrochemical degradation of methyl orange (MO). The SEM, XRD and cyclic voltammetry testsshowed that Nb/PbO2 electrode surface was dense, uniform and mainly composed of -PbO2 with asmall amount of -PbO2, as well as it has good catalytic effect on degradation of MO. The effects ofsupporting electrolyte, degradation temperature, current density and pH value on the decolourisationo efficiency of MO had also been studied. Results revealed that at initial pH=6.0, 45 C temperature, 50 mAcm current density, 0.08 molL electrolyte (Na2SO4) concentration, and 30 min electrolysistime, the colour removal efficiency and COD removal reached 99.6% and 72.6%, respectively. Thereaction mechanism of electrocatalytic MO degradation by Nb/PbO2 electrode mainly involved the OHradical attack of parent molecules, and the degradation followed pseudo-first-order kinetics.