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8651808 
Journal Article 
Preparation of MnO2/EGM electrode and electrochemical degradation of Rhodamine B 
He, J; Chen, S; Tang, S; Gao, Z; Huang, X; Song, L 
2020 
Yes 
Huanjing Kexue Xuebao / Acta Scientiae Circumstantiae
ISSN: 0253-2468 
40 
11 
3922-3930 
Chinese 
In order to develop an efficient electrochemical cathode material and improve the yield of dissolved oxygen reduction to H2O2, a MnO2/EGM electrode was prepared by electrodeposition method, which was also used to degrade Rhodamine B (RHB).In this work, pure graphite electrode and MnO2/EGM electrode were used as the anode and the cathode, respectively, where the effects of the initial pH value, current density, electrolyte concentration, initial RHB concentration and reaction temperature on the decolorization of RHB were investigated.The as-obtained experimental results and conclusion were as follows: MnO2 was uniformly loaded on the surface of EGM electrode by electrodeposition method.When the initial pH was 2, the current density was 40 mA•cm-2, the electrolyte concentration was 0.15 mol•L-1, the initial concentration of RHB was 8 mg•L-1, and the temperature of the reaction system was 25 ℃ in the two-dimension electrode system, the decolorization rate of RHB reached 94.43% after 30 minutes of electrolysis, which accorded with first-order reaction kinetics.In addition, the degradation mechanism of RHB had been preliminary analyzed with the cyclic voltammetry (CV) method, which could be applied to investigate the electrochemical behavior of the composite electrode and the tracking analysis of H2O2 concentration under the best degradation conditions.It is found that the dissolved oxygen in the electrolyte could be reduced to H2O2 with strong oxidizing properties on the surface of the MnO2/EGM electrode, destroying the chromophores of RHB and achieving the purpose of decolorization of RHB. © 2020, Science Press. All right reserved. 
Electrochemical degradation; Electrodeposition; Expanded graphite; Manganese dioxide; Rhodamine B