Abstract: The effects of film coating number, roasting temperature and initial concentration of azo dye on the photocatalytic activity of immobilized titanium dioxide film of metal wire net were investigated, which was prepared by TiO₂ colloid synthesis, TiO₂ colloid film coating on stainless steel net surface by dip-coating method and then its immobilization on the net by roasting. The results indicate that the film can have excellent photocatalytic performances when roasted at 600～700 ℃ for 2 hours. When it is used to make a photo degradation for three hours for 27 mg/L azo dye, the decolorization rate of azo dye reaches 99.07%. The crystal film is bonded tightly on the metal net surface t, and will keep a good photocatalytic activity when the film is used repeatedly.

Key words: TiO₂ film immobilized on wire net, Photocatalysis, azo dye, Film coating number, Roasting temperature