WO3/TiOF2复合催化剂的制备及其光催化性能研究

采用酞酸丁酯、氢氟酸、无水乙醇、钨酸钠和十六烷基三甲基溴化铵为原料，通过水热法制备了WO₃/TiOF₂复合光催化剂，用X-射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、固体紫外漫反射（UV-vis DRS）、荧光光谱（PL）等分析手段对WO₃/TiOF₂复合催化剂进行了表征；利用罗丹明B的脱色降解研究了WO₃/TiOF₂复合催化剂的光催化性能；通过罗丹明B溶液的紫外可见吸收光谱（UV-Vis）变化研究了催化剂作用下罗丹明B的脱色机理。在加入0.1 g复合催化剂和模拟太阳光源照射下，初始质量浓度为10 mg/L的罗丹明B溶液在2.5 h内降解了95.8%，光催化的性能优异，说明制备的WO₃/TiOF₂复合光催化剂有良好的太阳光催化应用前景。

Preparation and photocatalytic activity of TiOF2 and WO3/TiOF2 photocatalyst

WO₃/TiOF₂ composite photocatalysts have been prepared by a hydrothermal route using butyl titanate, hydrofluoric acid, absolute ethanol, sodium tungstate and cetyltrimethylammonium bromide as raw materials. The structures of the composite photocatalysts were characterized by XRD, SEM, TEM, UV-Vis and PL techniques. The photocatalytic performance of the TiOF₂/WO₃ composite catalyst was investigated using the decolorization and degradation of rhodamine B as a probe reaction. The mechanism of decolorization of rhodamine B was investigated by monitoring its UV-Vis absorption spectrum. The results showed that doping with WO₃ affects the crystal morphology of TiOF₂ and increases its specific surface area. It thus provides a contact point and space for the degradation of rhodamine B at different levels, and reduces the band gap and the recombination probability of the electron holes. As a result, the photocatalytic activity is enhanced. When a composite catalyst (0.1 g) was dispersed in a rhodamine B solution with an initial concentration of 10 mg/L under solar light irradiation, the degradation of rhodamine B reached 96% after 2.5 h, confirming the excellent performance of the composite catalyst. This work shows that the TiOF₂/WO₃ composite photocatalyst has good prospects for application in solar photocatalysis.