钛基Ce掺杂SnO_2-RuO_2电极的制备及其对焦化废水的电解处理

采用溶胶-凝胶法制备了经稀土元素Ce掺杂改性的Ti/RuO_2-SnO_2-Ce电极,利用SEM、XRD、EDS等分析方法对电极表面的形貌、物相和涂层成分进行了表征,利用CV曲线、LSV曲线等检测手段对电极的电化学性能进行了测试。以Ti/RuO_2-SnO_2-Ce电极为阳极,钛板为阴极,构建电化学氧化反应装置,并采用其对焦化废水进行电解处理。结果表明,Ti/RuO_2-SnO_2电极经稀土Ce改性后极板表面活性位点数量明显增大,金属涂层的结晶化程度明显增强,电极的催化氧化活性显著提高。室温条件下,保持pH值为7.83,在电流密度为30mA/cm~2,电解时间为30min时,焦化废水经电解处理后COD去除率可达91.63%,TOC去除率可达66.22%,UV254值下降到0.921。

Preparation of Ti-Based Ce-Doped SnO2-RuO2 Electrode and Its Electrolytic Treatment of Coking Wastewater

The Ti/RuO2-SnO2-Ce electrode modified by doping with rare earth element Ce was prepared by sol-gel method. The morphology, phase, and coating composition of the electrode surface were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), energy disperse spectroscopy (EDS) and other analytical methods. And the electrochemical performance of the electrode was tested using detection methods such as CV curve and LSV curve. Taking Ti/RuO2-SnO2-Ce electrode as the anode and a titanium plate as the cathode, an electrochemical oxidation reactor was constructed and used for electrolytic treatment of coking wastewater. The results show that the number of active sites on the surface of Ti/RuO2-SnO2 electrode modified by rare earth Ce increased significantly, the crystallization of the metal coating was obviously enhanced, and the catalytic oxidation activity of the electrode was remarkably improved. At room temperature, the pH was maintained at 7.83, the current density was 30 mA/cm2, and the electrolysis time was 30 min. After the electrolytic treatment of coking wastewater, the COD removal rate and the TOC removal rate reached 91.63% and 66.22%, respectively, and the UV254 value decreased to 0.921.