Preparation Of Doped Titani Multilayer And Its Photocatalytic Property Research

The thesis studied nanophase materials with their best doptant and the mechanics, the SiO₂-TiO₂, Fe2O3-TiO₂, CeO₂-TiO₂ nanophase photocatalysis was prepared by sol-gel method. The activity of non-uniform doped multiplayers was characterized by photocatalytic degradation of aqueous methyl orange under UV and visible light irradiation with self-made epuipument. The principle was also discussed with PN junction. Nano-film of N-doped TiO₂(N-TiO₂) were prepared at a certain temperature of 600℃in pipe-still heater.the film was studied with it's visible light activity.The main test contents were as follows.TiO₂ was modified by Si, Ce, Fe with sol-gel method.Test got the relation between degradation rate and the best doping amount.In this study the correlation between crystal structure and photocatalysis of TiO₂ doped with different non-uniform multiplayers was studied. the average particle size was about 30nm, 14nm, 24nm. The results illustrate that the order of the FT, FF and TT films is FT>FF>TT , and in visible light the CeO₂-TiO₂ films have the better activity than Fe2O3-TiO₂ films.Nano-films of N-doped TiO₂(N-TiO₂) were prepared at a certain temperature of 600℃in pipe-still heater.The samples were modified by nitrogen doping in 3h, 4h, 5h respectively. The prepared films were characterized by XRD, XPS and UV-Vis absorbance spectra. The results showed that the crystal structure of N-TiO₂ was anatase, the average particle size was about 20nm and the optical absorption edge of film was significantly extended from 387nm to about 520nm that is in the visible-light range. N partly taken the place of O in TiO₂ crystal lattice and formed a new TiO₂-xNx crystal lattice. In the uv light,the order of activity among the flims is a>b>c. but in the visible light is c>b>a.