| Nowadays,water pollution is becoming increasingly critical issue due to the fast-developing modern industry,in which electrocatalytic oxidation technology,Electrocatalytic oxidationas a novel effluents treatment technology,has raised the intense research interests in recent studies.Among the electrocatalytic anode materials,Ti/Sb-SnO2 electrode material has been proved to be a great candidate with promising application in effluents treatment.The Ti/Sb-SnO2 electrode prepared by electrodeposition technology reveals good stability,yet its electrocatalytic degradation ability requires further improvement.This study comprehensively studies the electrodepposited Ti/Sb-SnO2.The multiple-layer Ti/Sb-SnO2electrode with excellent electrolytic ability and long-term stability was developed by proper surface modification and nanoparticle-doping methods.The primary conclusions are listed as follows:（1）The mono-layer Ti/Sb-SnO2 electrode was prepared by direct current（DC）electrodeposition.Based on the catalytic degradation efficiency of benzoic acid,the performance evaluation the performance,combined with other physicochemical characterization tests,the optimum process for electrode preparation was determined as follows:Sb Cl3 fraction is 0.05%current density is 30m A/cm2,calcination temperature is600℃.The electrode prepared by t,his process has a uniform tin-antimony oxide structure.The accelerated life of the electrode reached 2 hours.The degradation rate of benzoic acid can reach 82%within 10 hours,and the degradation rate constant of benzoic acid can reach2.87×10-3 min-1.（2）Using single-layer Ti/Sb-SnO2 electrode as intermediate layer,double-layer Ti/Sb-SnO2 electrode was prepared by DC electrodeposition technique.Combined with various characterization tests,a more suitable intermediate layer preparation parameters are selected:current density 20m A/cm2,calcination temperature 500C,and the optimal process parameters of active layer:Sb Cl3 mass fraction 0.05%,current density 30m A/cm2,calcination temperature 700℃.The accelerated life of the double-layer electrode prepared by this process can reach 8 hours;at the same time,the active layer of the electrode shows a uniform pore structure,the real chemical reaction area is larger,and the degradation rate of benzoic acid can reach 99%after 10 hours.（3）Using single-layer Ti/Sb-SnO2 electrode as intermediate layer,double-layer Ti/Sb-SnO2 electrode was prepared by pulse electrodeposition technology.Through various characterization tests,the effect of different pulse average current density on the performance of double-layer electrode was studied.It was determined that the optimal pulse average current density was 20m A/cm2,After 10 hours,the degradation rate of benzoic acid was as high as 95%,and the accelerated life was 4.5h.（4）The double-layer Ti/Sb-SnO2 electrode was prepared by DC-TiO2 sol-enhanced electrodeposition and pulse-TiO2 sol-enhanced electrodeposition using single-layer Ti/Sb-SnO2 electrode as the interlayer.In the DC electrodeposition system,the performance of the double-layer electrode is the best when the concentration of TiO2 sol is 10m L/L,and the accelerated life of the electrode is up to 5.5h,the degradation rate of benzoic acid can reach97%after 10h;in the pulse electrodeposition system,when the concentration of TiO2 sol is15m L/L,the performance of double-layer electrode is the best,the accelerated life of the electrode is 5.6h,and the degradation rate of benzoic acid can reach 96%after 10h. |
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