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以钛酸丁酯为前驱物,醋酸为酸催化剂,采用溶胶—凝胶法制备掺有不同质量分数Pt的纳米TiO2粉体。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)等现代分析手段对所制备的不同Pt/TiO2纳米粉体的微观结构进行了表征。并以甲基橙染料的光催化降解为模型反应,考察了不同条件下所制备的光催化剂的光催化活性,探讨了纳米粉体中Pt的掺杂量对其光催化活性的影响。实验结果表明,Pt质量分数为0.2%的纳米TiO2粉体的光催化活性最好,过低或者过高的掺Pt量无法提高TiO的光催化活性,甚至会降低TiO的光催化活性。
Using butyl titanate as precursor and acetic acid as acid catalyst, nano-TiO2 powder with different mass fraction Pt was prepared by sol-gel method. The microstructures of the prepared Pt / TiO2nanopowders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy Characterization. The photocatalytic activity of the photocatalyst prepared under different conditions was investigated with the photocatalytic degradation of methyl orange dye as a model reaction. The effect of Pt doping on the photocatalytic activity was also discussed. The experimental results show that the photocatalytic activity of nano-TiO2 powder with Pt content of 0.2% is the best, too low or too high content of Pt can not increase the photocatalytic activity of TiO, and even reduce the photocatalytic activity of TiO.