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Up to now, nano-TiO2 is regarded as the best photocatalyst in semiconductors. As a photocatalyst, nano-TiO2 possessess many advantages: safety, innocuity, no side-effect, low-cost and no secondary pollution. However, there are still many problems in the application process of nano-TiO2 photocatalyst, such as, the lower activity under visible light, difficult to be recovered for direct-used of powder and easy to be deactivity.In the present, most research work focus on improving the activity of nano-TiO2 photocatalyst, which include revising preparation methods, element adultaration and surface modification. However, little research had been done in kinetics mechanism of photocatalytic reaction, photocatalyst life-span, regeneration methods and the influence of all kinds of ions on photoactivity during the application. So it will have far-reaching reality meaning to study these problems. It will provide theory base for application of nano-TiO2 photocatalyst.In the present dissertation, the main researches and results as fellow:1. Nano-TiO2 powders have been prepared by calcining H4TiO4 precusor made by acid resolving, hydrolysing industrial H2TiO3. In which, a kind of special surfactant is added as dispersant. The influences of calcination temperature and time on the crystalline structure, particle size and photoactivity have been deeply studied.2. Intrinsic Photocatalytic Rate, an important quantitative parameter which can evaluate the application properties of photocatalyst has been brought forward in the
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