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Study on Preparation and Photocatalytic Properity of Solid Superacid SO42-/TiO2

Author: CaoYanYan
Tutor: YangHongGang
School: Wuhan University of Technology
Course: Environmental Engineering
Keywords: Titanium dioxide Modified Solid Superacid Methylene blue Formaldehyde Photocatalytic Degradation
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 60
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Abstract


Nano-titanium dioxide is inexpensive, non-polluting, high photocatalytic activity, etc., has been extensively studied in recent years. Because of its low quantum efficiency, the use of solar energy is low, limiting its widespread application. Therefore, be modified to improve its photocatalytic quantum efficiency and the utilization of solar energy. This article using the sol - gel prepared SO 4 2 - modified nano TiO 2 photocatalyst discussions on the preparation parameters determine The best preparation parameters: nitric acid: sulfuric acid = 1:1 (volume ratio), the calcination temperature of 500 ° C, roasting time of 2 h. Nano TiO 2 photocatalyst comparison, prepared by solid superacid SO 4 2 - / TiO 2 characterization. By transmission electron microscopy (TEM) and X-ray learned: the nano TiO 2 particulate and SO 4 to 2 - / TiO 2 microparticles substantially spherical particle diameter of about 10 ~ 20nm, lattice fringes can be seen clearly, the diffraction peak characteristic of the other ions in the catalyst does not appear, only the characteristic diffraction peak of anatase, indicating that both the crystalline phase mainly composed of anatase, SO 4 2 - did not enter the lattice. Infrared spectroscopy: TiO 2 SO 4 2 - bands blue shift and broadening phenomena occurring after solid acidification, and can be attributed to the SO 4 2 - TiO 2 surface chelating bidentate adsorption. Methylene blue as a target simulated wastewater carried photocatalytic degradation experiments, and discuss the factors affecting the degradation of methylene blue light catalytic: blank experiment, adsorption experiments, light intensity, ventilation intensity, light catalyst dosage, the catalytic reaction time, hydrogen peroxide added amount , the repeated use of the catalyst performance. The results show that: certain adsorption of methylene blue photocatalyst; under certain conditions, light intensity and ventilation intensity increased, conducive to the improvement of the photocatalytic activity; The light catalyst cast plus the amount of 12g / L, methylene blue decolorization rate reached 99.72%; continued reaction 3h, methylene blue decolorization rate stabilized; hydrogen peroxide will significantly increase its methylene blue decolorization rate; through the roasting process, SO 4 2 - / TiO 2 , good repeated use of the performance. The object of formaldehyde as the photocatalytic degradation of indoor air, the coating is preferably prepared and the coating process, using a coating having a photocatalytic activity, degradation of performance of the photocatalyst formaldehyde. The content of the discussion coatings photocatalyst, initial concentration of formaldehyde, light intensity and film thickness on the photocatalytic degradation of formaldehyde. The results show that: the degradation rate of the formaldehyde with the light increase in the catalyst content is increased when the formaldehyde content of 7.5g / L of formaldehyde with a degradation rate of 65.08%; photocatalyst dosage of 6.5g / L of formaldehyde initial The initial concentration of 0.137mg / m 3 ~ 0.0566mg / m 3 , the reaction time under the same conditions, the lower the initial concentration of formaldehyde and formaldehyde the degradation rate. When the initial concentration of formaldehyde is 0.0566mg / m 3 , the degradation rate of 71.49%; under certain conditions, the degradation rate of formaldehyde is increased as the light intensity increases; coating thickness on photocatalytic formaldehyde The degradation of the impact is not obvious.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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