| Advanced Oxidation Technologies（AOPs）are a novel,fast,environmentally and friendly method commonly used to eliminate pollutants from textile,agrochemical,paper and pharmaceutical wastewaters.Highly oxidizing including OH radicals and sulfate radicals,are formed in AOPs.They play an important role in electron transfer,free radical addition processes and hydrogen extraction..Therefore,AOPs can decompose or convert various difficult-to-degrade chemicals into carbon dioxide and water.Among them,electrochemical oxidation is one of the most popular alternative methods for treating organic wastewater in advanced oxidation technology with high efficiency and green,high catalytic activity as well as simple reaction conditions.Ti/SnO2-Sb electrodes are one of the ideal electrode materials with the advantages of low cost,low pollution and high hydroxyl radical yield,which have many advantages in electrochemical oxidation technology.However,the poor electrode stability and low catalytic efficiency hinder the wide application of Ti/Sb-SnO2 electrodes,and for this reason,the Ti/SnO2-Sb electrode was modified in this study.（1）The Ti/SnO2-Sb-TiC electrode was successfully prepared by electrodeposition method by introducing TiC nanoparticles uniformly dispersed in the deposition solution,which has a porous double-layer structure to improve the catalytic performance and retard the penetration of industrial wastewater inside the electrode.Compared with the Ti/SnO2-Sb electrode,the electrode lifetime was improved by nearly 6 times,reach 580 min（1000m A/cm2,1 mol/L 1 mol/L H2SO4）,the phenol removal rate reached 90.65%,the oxygen precipitation potential was as high as 2.13 V,and the charge transfer resistance was 2.245Ω.The results showed that the porous structure enabled the electrode to have a high specific surface area,exposing more active sites and shortening the transfer distance between hydroxyl radicals and pollutants to improve the degradation efficiency.The unique double-layer structure is obviously different from the traditional electrode,which adds a layer of protective barrier and provides a new idea for delaying the electrode lifetime.（2）A Ti/TiN-SnO2-Sb-Ni electrode with a micron-sized flower-like structure was prepared by co-doping of TiN nanoparticles and nickel ions by electrodeposition,and the accelerated lifetime was extended nearly 20 times to 23.5 h（1000 m A/cm2,1 mol/L 1 mol/L H2SO4）compared with the Ti/SnO2-Sb electrode,and the degradation of simulated sulfamethoxazole wastewater The removal rate was improved by 32.62%,up to 90.33%,COD removal rate was 85%,TOC removal rate was 73%,and the removal rate of electrode cycling degradation five times was still up to 85%.The effects of the initial concentration of sulfamethoxazole in the simulated wastewater,temperature,current density,free radical scavenger and different electrodes on the removal rate of sulfamethoxazole in the simulated wastewater were investigated to select the best degradation conditions. |
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