Preparation And Evaluation Of Three-dimensional Electrocatalytic Particle Electrode

Phenolic compounds are organic pollutants that are widely present in industrial wastewater.They have the characteristics of wide pollution,large emissions,strong toxicity,and difficult degradation.Thorough degradation and mineralization of phenols and other refractory organics has always been the focus of research.In this study,a particle electrode with high electrocatalytic activity,physical and electrochemical properties was prepared and applied to three-dimensional electrocatalysis to improve the degradation effect of phenol.The main research contents and results are as follows:Firstly,the particle electrode carrier with good material and electrochemical performance is screened out,single metal component and composite metal component particle electrode are prepared by dipping method,characterized by BET,XRD and SEM,and electrochemical analysis is carried out by LSV and CV,Through the degradation rate of phenol and COD,UV-visible spectroscopy,energy consumption and current efficiency,comprehensively evaluate the degradation performance of the particle electrode for phenol simulated wastewater.The research results show that the GAC carrier exhibits good phenol degradation performance,material and electrochemical performance.GAC was selected as the carrier to prepare single metal component and composite metal component particle electrodes,and the phenol simulated wastewater degradation experiment was carried out,through the degradation of phenol and COD.The comprehensive analysis of efficiency,energy consumption and current efficiency,and UV spectrum of phenol effluent shows that the Sn-Sb/GAC particle electrode has the best phenol degradation performance,with a COD removal rate of 74.5%,energy consumption of 28.7kwh/kg COD,and current efficiency of 59.0%.The material and electrochemical performance analysis of the particle electrode shows that the surface of the Sn-Sb/GAC particle electrode presents a network structure,which is not only conducive to mass transfer during the reaction,but also generates more reactive sites to further strengthen the particles.Electrocatalytic activity of the electrode;Sn-Sb/GAC has high oxygen evolution potential(1.593 V(vs SCE))and large volt-ampere charge(57.5 m C/cm~3),indicating that it can effectively inhibit oxygen evolution side reactions,improve current efficiency,and reduce Energy consumption.Using a single-factor phenol degradation experiment,the optimal operating parameters of the reaction system were obtained:normal temperature,current density11 m A/cm~2,electrolyte concentration 0.05 mol/L,inlet water concentration 200 mg/L,and neutral conditions do not adjust p H.The stability inspection results show that after Sn-Sb/GAC runs 20 times,the degradation rate of phenol and COD can still reach 71.8%and 60.4%,indicating that its stability is better;the results of the regeneration performance inspection show that the method of adding electrolytes to pure water The particle electrode is regenerated by electrolysis,and the degradation rate of phenol and COD reaches 84.8%and 70.2%after regeneration.By adding tert-butanol as the?OH quencher,it is proved that the degradation of phenol is the result of direct oxidation and indirect oxidation.UV-Vis spectroscopy and LC-MS are used to analyze the intermediate products generated during the degradation reaction of phenol,and phenol is proposed.Possible degradation pathways.