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以钛酸丁酯、无水乙醇、钨酸铵为原料,采用溶胶-凝胶法合成了WO3/TiO2复合光催化剂;采用光还原技术制备了Ag负载WO3/TiO2光催化剂,借助X射线粉末衍射(XRD)和UV-Vis光谱等技术对样品的组成和光吸收性能进行了表征,并以罗丹明B为模型污染物考察样品的光催化活性。XRD分析表明,所得粉体均为锐钛矿型纳米TiO2,且与WO3复合后,纳米TiO2特征衍射峰宽化,强度降低;UV-Vis光谱分析表明,载银使得催化剂在400—700nm的可见光区域对光响应,且在紫外光区吸收显著增强,对光具有更高的利用率;以罗丹明B为降解物的光催化实验表明,WO3复合对纳米TiO2光催化活性有显著的影响,而载Ag后其光催化活性进一步提高,将该光催化剂用于炼油厂废水的处理,效果较好。
WO3 / TiO2 composite photocatalyst was synthesized by sol-gel method using butyl titanate, anhydrous ethanol and ammonium tungstate as raw materials. Ag supported WO3 / TiO2 photocatalyst was prepared by photoreduction and characterized by X-ray powder diffraction (XRD) and UV-Vis spectroscopy were used to characterize the composition and optical absorption of the sample. Rhodamine B was used as a model pollutant to investigate the photocatalytic activity of the sample. XRD analysis showed that the obtained powders were anatase nano-TiO2, and after complexed with WO3, the characteristic diffraction peaks of the nano-TiO2 were broadened and their intensities were reduced. UV-Vis spectral analysis showed that the silver-supported catalyst made visible light at 400-700 nm The results showed that the photocatalytic activity of Rhodamine B as a degradation product showed that WO3 complex had a significant effect on the photocatalytic activity of nanosized TiO2, The photocatalytic activity of Ag is further improved after Ag is loaded, and the photocatalyst is used for the treatment of refinery wastewater, and the effect is better.