Performance Of Doped Ti/SnO₂Electrodes In Electrochemical Water Treatment

As one of the most urgent issues to be settled currently, the water pollution is variousand complex, so it puts forward a rigorous test to the traditional methods of the biologicalpurify process. Now, because an amount of refractory organic pollutants emergence, it ishard to satisfy the modern social need via simple treatment process. Advancedelectrochemical oxidation process （or named AEOP） attracts considerable researchattention and presents a good application prospect, due to its strong oxidation performance,strong controllability, mild reaction condition, low-volume application, environmentalcompatibility, and easy combining with other treatment methods.Developing the electrode with high electrochemical activity, strong stability andsuitable for the removal of environment pollutant is important for application ofelectrochemical water treatment technology, and is also the focus of the researchers. Inthis dissertation, the doped Ti/SnO₂electrodes are prepared by different preparationmethods and are characterized by SEM, EDS and XRD. The pollutants degradationperformance, electrochemical properties, and ozone generation performance of the dopedTi/SnO₂electrodes are also studied.The results show that the surface coating of doped Ti/SnO₂electrodes are mainlySnO₂in rutile phase. The surface morphology, composition and structure are significantlydifferent between the doped Ti/SnO₂electrodes prepared by different methods. Theelement content of the surface coating on electrodes prepared by different methods isnotable different which is influenced by the structure of electrode surface and the heattreatment process. The preparation of the intermediate layer can improve the morphologyand the structure of electrode, and enhance the electrode performance. The degradation ofsulfamethazine （SMT） by doped Ti/SnO₂electrodes shows that the rate of SMT degrationis influenced by current and solution pH and the acidic condition is conducive to thedegradation of SMT and its intermediate products. The cyclic voltam metry curves suggestthat no obvious direct electrocatalytic oxidation process occurs on the doped Ti/SnO₂electrode surface, but indirect oxidation process exists. Moreover, in acidic condition, thedoped Ti/SnO₂electrodes have higher oxygen evolution potential, which is helpful to the degradation of organic pollutants. The ozone generation performance of the dopedTi/SnO₂electrodes illustrates that current influences the rate of the dissolved ozoneconcentration saturation, and an optimal current value exsits. The dissolved ozonesaturated concentration is insusceptible to electrolyte volume, but electrolyte volumeaffects the time needed for dissolved ozone saturation.The present work will promote the application of electrochemical technology inwater treatment system, and is helpful to the preparation of efficient electrode.