Preparation Of Titanium-based Rare Earth Doped SnO₂-RuO₂ Electrode And Electrochemical Oxidation Performance

Coking wastewater is an industrial wastewater produced during coking and gas production processes.It has the characteristics of complex components,high organic content,and poor biodegradability.Therefore,the treatment of coking wastewater is a difficult problem in the field of refractory wastewater treatment.Electrochemical advanced oxidation technology is one of many water treatment methods.Electrochemical advanced oxidation method uses electron transfer to generate hydroxyl radicals,which can react with organic pollutants in water to completely oxidize organic matter to H₂O,CO₂ and inorganic salts.This article mainly studies the different rare earth modified Ti/SnO₂-RuO₂ electrodes.In-depth analysis of SEM,EDS,XRD patterns of electrode materials.Detection of COD,TOC,UV₂₅₄54 of wastewater after electrochemical oxidation.The three-dimensional fluorescence spectrum,UV-vis and GC-MS were used to analyze the degradation mechanism of organic matter in coking wastewater.Ti/SnO₂-RuO₂ electrodes doped with rare earth?La,Ce,Yb?were prepared by sol-gel method.The element distribution and cell morphology of the electrode surface were analyzed by SEM,EDS,and XRD of the detection electrode.The LSV and CV curves were used to detect the oxidation peak,oxygen evolution potential,and active charge on the electrode surface.Using Ti/SnO₂-RuO₂-La,Ti/SnO₂-RuO₂-Ce,Ti/SnO₂-RuO₂-Yb electrodes as anodes for electrochemical oxidation of coking wastewater.The three-dimensional fluorescence spectrum,UV-vis,and GC-MS were used to detect the organic matter content of the coking wastewater before and after treatment,and the COD,TOC,and UV₂₅₄54 of the wastewater under different current densities were compared.The results show that the doping of the rare earth La improves the surface morphology of the Ti/SnO₂-RuO₂ electrode,increases the crystallinity of the oxide crystals on the electrode surface,increases the specific surface area of the active coating,and increases the number of active sites.Using Ti/SnO₂-RuO₂-La electrode to treat coking wastewater.Under the conditions of current density of 10 mA/cm ²,pH of 8 and temperature of30?,the electrochemical oxidation effect of wastewater is the best,and its removal rate of COD can reach 85.06%.The doping of rare earth Ce increases the oxygen evolution potential and the charge capacity of the Ti/RuO₂-SnO₂ electrode.Using the Ti/SnO₂-RuO₂-Ce electrode to treat coking wastewater,the COD removal rate of coking wastewater reached 91.63%,the TOC removal rate reached 66.22%,and the UV₂₅₄54 value decreased to 0.921 under the conditions of electrolysis time of 30 min and current density of 30mA/cm².When the Yb doping content is 1.5%,the surface of the Ti/SnO₂-RuO₂ electrode is flat and has a large number of Sn and Ru oxide crystal forms.The electrode has a high oxygen evolution potential and electrocatalytic activity.Using Ti/SnO₂-RuO₂-Yb electrode to treat coking wastewater When the current density is 10mA/cm² and the electrochemical oxidation time is 30min,the COD removal rate of coking wastewater is up to 85.06%,the TOC removal rate is up to 60.59%,and the UV₂₅₄54 can be 1.594 Degraded to 0.507.The degradation effect of Ti/SnO₂-RuO₂-Yb?Yb doped amount 1.5%?electrode coking wastewater was studied by UV-visible spectrometry,three-dimensional fluorescence spectrum,and GC-MS.The results showed that the organic peaks at the wavelengths of 206.5 and 291 nm were significantly reduced.The fluorescence peak in the region of?ex=275³00nm/?em=250³00nm decreases.After electrochemical oxidation treatment,the abundance of corresponding polymer organic peaks in coking wastewater is significantly reduced.Therefore,the rare earth Yb modified Ti/SnO₂-RuO₂ electrode has a good effect of removing phenolic organic compounds,polycyclic aromatic hydrocarbons,and alkane organic compounds containing benzene rings in the coking wastewater.