| Nanocrystalline titanium dioxide finds a broad field of realized and potential applications in the areas of photocatalysis. Selective doping of the crystalline matrix has been proved to be an efficient route to improve the photocatalytic activity of nano-TiO2 when it was doped with various metal captions. The difficulty of recovery, steadiness and inactivation can be resolved by immobilization. The quantum efficiency of immobilized-TiO2 is lower than that of suspended-TiO2 with same TiO2 mass using the traditional substrates. At present, the substrates, which have some specific properties such as high specific surface area for high-adsorption, are regarded as better. The double functions of photocatalysis and adsorption can come true with high efficiency simultaneously.The aim of this dissertation is to initiate the research of the non-metal ion modification and support with ACF of photocatalystst and the decolorization of Methylene blue aqueous solution and seek after optimal condition and general degradation rules, by which we look forward to building up the base for further research.Nano-sized SO42/TiO2 particles were prepared from TiCl4 and (NH4)2SO4 by Sol-Gel method and characterized by XRD and FT-IR technologies. Photocatalytic degradation of Methylene blue solution under ultraviolet radiation was carried out using nanoparticle TiO2 as the photocatalyst. It was found that modified-TiO2 remarkably improved its photocatalytic activity. Compared to pure TiO2, the XRD peak of SO42--modified TiO2 expands visibly. The surface free energy or surface diffusion coefficient may become small by the SO42--modification, which restraints surface shrinkage or ion aggregation. The effect of initial concentration of solution, TiO2 catalyst additive mass, materials of photocatalytic reactor on the degradation rate of Methylene blue were investigated in detail. The results indicated that when the mass concentration of nano-TiO2 is between 1.0 g/L and 1.5 g/L, Methylene...
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