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TiO2 Catalyst Grown on Ti Alloy in Situ for the Photo-Catalytic Reduction of Cr（VI）

Author: ZhuHongKui
Tutor: JiangZhaoHua
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Modified TiO2 films Photocatalytic reduction Anodic oxidation Ti substrate Chromate potassium
CLC: O643.36
Type: Master's thesis
Year: 2008
Downloads: 31
Quote: 1
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Abstract


With the development of the industry, the limited water source is polluted seriously day by day, especially for Cr（VI） in the waste water has threatened our health straightly. So eliminating Cr（VI） in the water has become an important work of the environment protection. In recent years, the photocatalytic degradation is consided as an environmental friendly technique to deal with the waste water because of its low energy expense, no secondary pollution and easy operation process etc. Therefore, much attention has been paid by the researchers.In this paper, films were produced on Ti substrate with anodic oxidation method in H2SO4 electrolyte. Process parameters （electrolyte concentration, current density and voltage） were optimized according to the photocatalytic reduction efficiency of chromate potassium. The results showed that TiO2 films prepared in the electrolyte of H2SO4 （0.5mol/L）, the current density at 100mA/cm2 and the voltage at 200v had higher photocatalytic activity.In order to improve photocatalytic activity of the TiO2 films, differdent additives were doped into the electrolyte of H2SO4 or the produced films were post-calcined under different temperature. The technique parameters for the preparation of the the high-activity modified TiO2 catalyst were optimized by using SEM、XRD and EPMA, as well as the results of the photo reduction ratio and. The results showed that 0.2 g/L ZnSO4 dopant in the electrolyte of H2SO4 made the photo reduction ratio of the modified TiO2 catalyst up to 98%, and the post-calcinations at 873K for 30min with the following activity for 1h in H2SO4 improved the photo reduction ratio of the modified TiO2 catalyst to 96%.In the photocatalysis reduction system, the effects of pH, Ultraviolet lamp power, the start concentration of the chromate potassium and the cavity seizing materials on the photo reduction ratio of the chromate patassium were researched, and the reduction kinetic of the chromate potassium was discussed prelimarily. The results showed that photocatalytic reduction of TiO2 films for chromate potassium complied with the kinetic equation of Langumuir-Hinshlwood. When the concentration of chromate potassium was at 10-50 mg/L, the reduction process complied with the first-order reaction. The analysis of the reduction substance of chromate potassium showed that the Cr（VI） was reduced into Cr（III） which existed in the form of Cr（OH）3.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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