Abstract：It is important to improve the stability and catalytic capacity of Ti/PbO2 electrode for long term running of electrochemical process. In the present work chemically reduced graphene oxide (RGO) was included into β-PbO2 layer by using codeposition method to improve the performance of the electrode. The modified electrode was characterized by using scanning electron microscopy (SEM), X-ray diffractometry (XRD), cyclic voltammetry (CV) and electrochemical alternating impedance (EIS). Its capacity in producing hydroxyl radical (·OH) and lifetime was also checked. The catalytic effect of the PbO2-RGO electrode was evaluated using acidic red G (ARG) as the target degradant. The results showed that the modified PbO2-RGO electrode was β-PbO2 in nature. After modification the oxygenation overpotential increased from 1.60V to 1.83V, While the membrane impedance decreased from 144 Ω/cm2 to 16.2 Ω/cm2 with an increment of lifespan by 43.6%. The ARG degradation experiments demonstrated significant improvement on catalytic performance after electrode modification. Under optimized condition PbO2-RGO (0.05) electrode achieved decolorization of ARG for 98.5% and COD removal of 76.89% within 120min.
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LU Si-jia, ZHENG Xing, LI Xiao-liang. Chemically reduced graphene oxide modified PbO2 electrodes and the degradation of acidic red G. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3635-3641.
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