Fabrication Of SnO₂Electrode And The Characterization Of Electrocatalytic Properties

In recent years, the electrochemical oxidation technology has aroused extensive attention of researchers for its environmental compatibility and environmental friendly characteristics, which is developing rapidly. The core technology of electrochemical oxidation is developing high performance of anode materials. The anode materials must satisfy the conditions of high electricity catalytic activity, long life and so on. However, at present, the common anode material almost has some drawbacks, which limit the industrial application of electrochemical oxidation technology in wastewater treatment works.This paper aims to preparate modified SnO₂electrode, a kind of anode materials with high electricity catalytic performance and long service life. Following are the main research:First of all, to explore the preparation method of modified SnO₂electrode, and characterize it; Secondly, use the modified SnO₂electrode to treatment phenol wastewater, looking for the best parameters of electrocatalysis; Thirdly, to prepare tubular SnO₂catalytic membrane to explore the effect of the tubular SnO₂catalytic membrane on phenol removal efficiency using the technology of electrochemistry combined with membrane filtration.The good performance of SnO₂modified electrode has been already successfully prepared through the method of solid particle sintering+doped additives. The result proves that, the surface of SnO₂modified electrode is smooth and uniform, with good compactness; The electrochemical catalytic activity is high, and oxygen evolution potential is up to2.1V,2.0V and1.2V respectively in acidic medium, neutral solution and alkaline medium; The performance of the electrode is stable, and the aging test results that its servive life time can reach to2.3year under industrial conditions (current density of100mA cm^-2).The treatment of phenol in simulative wastewater with the SnO₂modified electrode is studied. Factors affecting removal rate were investigated, such as voltaic density, initial pH, electrolyte concentration and phenol concentration. The optimum operating parameters are: the optimum current density is15mA/cm^z, the optimum pH=5, the optimum electrolyte （Na2SO₄） concentration is2.5g/L, the best initial phenol concentration is200mg/L.The better electrocatalytic performance of tubular SnO₂catalytic membrane has been already successfully prepared through the method of sol-gel, which is a layer of SnO₂micro filtration membrane of thickness about60μm plated on the surface of tubular SnO₂ modified supporting body. Use the tubular SnO₂catalytic membrane to handle the phenol wastewater under the conditions of optimum operating parameters by the echnology of electrochemistry combined with membrane filtration. The results showed that the removal rate of the organic has greatly improved, and the removal rate of phenol and COD reached to80.1%and28.9%respectively, which means that the problem of the electrochemical diffusion controlled bottleneck has been initially solved.