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

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• 作者：Pengzhe SUN ((孙鹏哲)) ; Donghui CHEN ((陈东辉)) ; ^{chendhsit@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CeO2 ; PbO2 ; reactive brilliant red X-3B ; chemical oxygen demand ; decolorization ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：34
• 期：5
• 页码：507-520
• 全文大小：2065 K

文摘

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/cm² 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.