TiO₂Modified Catalyst Preparation And Catalytic

TiO2as the most widely used in the high performance optical catalyst, but the TiO2’s structure limit the sunlight utilization and only the sun3-4%. Therefore, to improve the photocatalytic activity of TiO2, the absorption region is extended to the visible region to become the focus of this paper.This article through three aspects of improving the TiO2photocatalytic properties, respectively is:H3PO4to TiO2/SO42-solid super acid modified, β-cyclodextrin exist under N/TiO2nonmetal doping and W doping toTiO2.First of all, the H3PO4modified TiO2/SO42-solid super acid preparation, through sol-gel prepared by different calcining temperature of TiO2/PO43-/SO42-catalyst and use N2physical adsorption, XRD, TEM, FI-IR characterization. Methanol and acetonitrile was synthesized from methyl three original acetic acid. The results show that the phosphate and sulfate common modified TiO2, TiO2/PO43-/SO42-solid acid catalyst, and with methanol and acetonitrile was synthesized from methyl three original acetic acid. Display when sulfate loading to5%, the best amount of catalyst for1.2g, the catalytic activity of the catalysts is highest, the yield is over87%.Secondly, in order to butyl titanate four as precursor, urea as nitrogen source by using modified sol gel preparation of a high catalytic activity of N/TiO2photocatalyst, and using X ray diffraction and Fourier-transform infrared spectroscopy on the structure and morphology of. Using of cyclodextrin inclusion action against a substrate, under UV irradiation of benzyl alcohol by photocatalytic oxidation reaction of. Investigation of the cyclodextrin/benzene methano Mass ratio and pH and other factors on yield effect. The results showed that benzene, methanol and water mass ratio of4/1, cyclodextrin/benzene methanol mass ratio of3/1can be achieved when the maximum yield of92%. Finally, using a deposition method, preparation of different content of W doped TiO2composite catalyst. Through XRD, N2, characterized by physical adsorption, rhodamine B as biodegradable materials. The results showed that:WO3-TiO2on photocatalytic degradation of rhodamine B, of which550℃baking under conditions of1.5%WO3-TiO2maximum catalytic activity.0.01g catalyst for70ml concentration20mg/L of rhodamine B in the25min degradation rate of94.5%was significantly higher than that of pure TiO2degradation rate.1.5%WO3-TiO2has good repeated use rate, repeat three times its degradation rate is still91.1%.