Nanometer Titanium Dioxide Controllable Preparation And Compound Photocatalyst Photocatalytic Performance

Photocatalytic oxidation technology is one kind of advanced oxidation technology which have been developed from 70 years in the 20th century.This technology have many virtues,for example,it can completely oxidize almost all the organics harmful pollutants which exist in water and air in room temperature,and can make use of sunlight energy,so have great application prospects.lots of scholars who come from physical,chemical and material field and so on have been mostly interesting in the field. a great quantity works have been carried out for the transformation and storage of sorlar energy,founding the theory of photocatalytic process,aiming to increase the photocatalytic efficiency,and extending the application field.At the present time ,TiO2 is the most important material studied in photocatalytic field.because its cheap ,safety and very stable physical-chemical properties.Although the titanium dioxide photocatalytic oxidation technology has the extremely widespread application prospect, however the most present research works occupies the laboratory stage, the practical application are very few.Firstly The most important factor which hinders its practical is the low efficiency and poor using of the visible light.secondly,the design of high efficiency photocatalytic reactor and the fixation and recycling of the photocatalyst also limit the practical application. the preparation for high-activity nanometer criterion titanium dioxide powder,the crystal and textile fiber as well as the research and development for high performance compound nanometer structure photocatalyst in this foundation is present hot Topic.The mainly production technology of Nano-TiO2 can be classified with vapor phase method and liquid phase method. Vapor phase method belong to high temperature reaction,have strongly corruption properties and high ask for designing and maintenance to the equipment.The key technology have been monopolized by few companies abroad.The liquid phase include sol-gel,hydrothermal, microemulsion, even precipitation method. But these methods exist some shortcoming such as expensive raw material, complex operating condition, long technical process and so on. The reactive-precipitation method with inorganic titanium salt as material posses most prospects. At the same time in order to urge the titanium dioxide photoproduction electron-hole pair separation, develop its response scope in the visible light spectral, achieve goal for sunlight using, precious metal compound, the transition ion and the inorganic anion doping, compound with other semiconductors...