ZnO-TiO2和WO3-TiO2复合薄膜光催化剂的制备与性能

采用溶胶一凝胶法在多孔钛片上制备了 ZnO-TiO₂和WO₃-TiO₂复合半导体光催化剂,用甲基橙的光催化降解反应对所得薄膜的催化活性进行评价,并通过XRD和DTA等手段对样品进行了表征.结果表明,ZnO和WO₃的掺入降低了TiO₂的相转变温度,ZnO适宜掺杂量为0.1 mol%, WO₃适宜掺杂量为0.5 mol%, ZnO-TiO₂和WO₃-TiO₂复合薄膜比纯TiO₂薄膜光催化活性分別高出77.0%和96.7%.

Preparation and Properties of ZnO-TiO2 and WO3-TiO2 Composite Film Photocatalyst

ZnO-TiO₂ and WO₃-TiO₂ composite film photocatalysts were prepared on porous titanium plates by sol-gel method. Their morphology and structure were characterized by XRD and DTA method. The photocatalystic activity of the film catalysts were investigated for photocatalysdc degradation of methyl orange. It was found that the Zn0-TiO₂ film photocataiyst calcined at 450℃ for 1 h with 0.1 mol%(molar percent) of ZnO showed higher photocatalytic activity than that of pure TiO₂ film by 77.0%, while the 0.5 mol% WO₃-doped TiO₂ film calcined at 450℃ for 1 h by 96.7%. TiO₂ supported on the porous titanium plates consists of both the anatase phase and the nitile phase, indicating that the addition of appropriate ZnO and WO₃ could effectively decrease the temperature of phase from anatase to rulile.