Fe^(3+)-SiO_2-TiO_2薄膜的制备及其光催化活性

Preparation and Photocatalysis Activity of Fe^(3+)-SiO_2-TiO_2 Film

Sol-gel法制备Fe3+掺杂TiO2催化剂的基础上,掺入SiO2纳米粉体,制备了一种改性Fe3+-SiO2-TiO2薄膜。以甲醛为降解对象,探讨金属掺杂和半导体复合量、活化温度、负载量等对该薄膜光催化活性的影响。结果表明,在500℃焙烧、质量比Fe3+∶SiO2∶TiO2=1.0∶12∶100、镀膜5层时,Fe3+-SiO2-TiO2薄膜的光催化活性最高,150min后甲醛降解率达93%,是单纯TiO2薄膜的1.9倍。

After Fe^3＋ doped TiO2 catalyst is prepared by sol-gel method, we mix it with SiO2 nanometer powder, then the modified Fe^3＋ -SiO2-TiO2 membrane is produced. Taking the formaldehyde as the degeneration substance, the influence of the recombined content of doped metal and semiconductor, activation temperature, the catalytic loadings on the photochemical property of this membrane are discussed. The result shows that the performance of Fe^3＋ -SiO2-TiO2 nanometer film is the best, when Fe^3＋： SiO2：TiO2 = 1.0： 12：100 and calcined at 500℃ and coating five films. After 150 rain, the degradation percentage of formaldehyde is 93%, which is 1.9 times as that of TiO2 film.