网固定TiO2薄膜的制备及光催化性能研究

采用TiO₂胶体合成-不锈钢金属网表面浸渍提拉法镀TiO₂胶体膜-焙烧工艺制备网固定TiO₂薄膜光催化材料，并以偶氮染料废水为降解对象，研究了镀膜次数、焙烧温度以及偶氮染料初始浓度对材料光催化活性的影响。结果表明：镀膜5次后在700 ℃下焙烧2 h，可以得到光催化性能优异的金属网固定TiO₂薄膜。用该制品对浓度为27 mg/L的偶氮染料废水光降解3 h，降解脱色率达到99.07%。TiO₂晶体膜在金属网表面键合牢固，重复使用仍保持良好的光催化活性。

Research on the Preparation of TiO2 Film Immobilized on Wire Net and Its Photocatalytic Performance

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.