Electrochemical degradation of reactive brilliant red X-3B with the（CeO2/C）-β-PbO2-PTFE composite electrode

• Published in: 中国稀土学报：英文版 2016, Vol.34 (5), p.507-520
• Main Author: 孙鹏哲 陈东辉
• Format: Article
• Language: English
• Subjects: CeO2; LC-MS分析; PbO2电极; 反应动力学方程; 扫描电子显微镜; 活性艳红; 电化学降解; 聚四氟乙烯复合材料
• ISSN: 1002-0721; 2509-4963

The（CeO2/C）-β-PbO2-PTFE composite electrodes modified by graphite powder,cerium oxide powder,polytetrafluoroethylene（PTFE）and the homemade β-PbO2 powder were prepared by the high pressure molding technique.The X-ray diffraction（XRD）was used to test the purity of the homemade β-PbO2 powder.The surface structure and electrical property of electrodes were characterized by using scanning electron microscopy（SEM）and the cyclic voltammetry curves（CV）.Those images indicated that in electrolysis the（CeO2/C）-β-PbO2-PTFE composite electrodes had higher activity than the β-PbO2-PTFE electrodes,as good as the excellent catalytic performance.In the electrode system the composite electrodes were applied to treat reactive brilliant red（RBR）X-3B solution and we studied the degradation influence factors and the reaction mechanism.The results showed that the electrode system was well in treating RBR X-3B solution with the 20%（CeO2/C）-β-PbO2-PTFE composite electrodes at the initial 100 mg/L RBR X-3B concentration,Na2SO4 concentration of 0.35 mol/L,the constant current density of 30 mA/cm~!2 and electrolyte pH =2.After electrolytic time of 90 min,the maximum decolorization and chemical oxygen demand（COD）removal rates reached 88.92% and 54.54%.And the decolorization rate of RBR X-3B was in conformity with pseudo-first-order kinetics equation.The RBR X-3B degradation mechanism in the electrochemical oxidation system was used with LC-MS to analyze the possible intermediates and degradation pathway.