Preparation Of Modified Ti/SnO₂-Sb Electrode And Its Application In The Catalytic Degradation Of 1,4-dichlorobenzene

1,4-dichlorobenzene?p-DCB? wastewater is toxic and hazardous,and is a kind of organic wastewater which is difficult to be degraded.It is showed that the electro-catalytic oxidation method is one of effective way to deal with. However, electro-catalytic oxidation electrode deteriorates fast, and has a short life, which affects their engineering application. Therefore, to explore the preparation of electrode with high electrical catalytic oxidation performance, durable long life, low cost is one of the research objectives of the related scientific and technical workers, and is also the main research content of this paper.In this study, the non-noble metal modified Ti/SnO₂-Sb electrode was prepared by polymeric precursor process, and its electrochemical performances were tested. Meanwhile, p-DCB wastewater was treated with catalytic oxidation using modified electrode. By discussing the influence factors, combined with the treatment effect of p-DCB wastewater, the best working parameters of electro catalytic oxidation system were determined, and the feasibility of the electrode used in engineering practice was discussed.After doping modification with non-noble metal, the tiny honeycomb structure was appeared on electrode surface, which increased the activity of the significant digits, enhanced the electrocatalytic activity of the electrode, and significantly improved the electrode life and stability. Experiments show that after doping modification, the p-DCB degradation rate increased; the Ti/SnO₂-Sb-Cu electrode had the best electric catalytic activity among all electrodes, and the degradation process of p-DCB was consistent with the first order kinetic equation.Through orthogonal experiment design, the optimal electrode preparation parameters are as follows: doped Cu, Sn:Sb:Cu was100:6:0.5, calcination temperature was 650?. The oxygen evolution potential of this electrode was 1.93V?vs.SCE?, industrial service life was 22.8d; after electric catalytic oxidation of 90 min, the removal rateof p-DCB reached 86.6%.The best working parameters of electrochemical oxidation degradation system of p-DCB are as follows: electrolyte Na2SO4 concentration was 0.1mol/L, initial solution p H was 8, voltage was20 V, electrode plate spacing was 2cm, cathode material was titanium.The removal rate of p-DCB was 96.31% under the optimal working conditions determined by orthogonal experiment. By UV-Vis, GC-MS analysis, degradation reaction process generated a series of small molecular chain compounds, in which p-DCB was degradated mainly by indirect oxidation. When applied to the practical wastewater treatment, the modified Ti/SnO₂-Sb-Cu electrode had a good treatment effect, p-DCB removal rate reached 70.12%, and the reaction had a low power consumption, which shows that using self-made modified Ti/SnO₂-Sb-Cu electrode with electric catalytic oxidation for p-DCB wastewater is feasible.