Abstract: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.