【摘要】 为提高TiO2的光催化活性,采用溶胶-凝胶法制备了两种不同掺钒方式的TiO2粉末,并用XRD、TEM、XPS和UV-V is等技术对样品进行了表征,通过对甲基橙的光催化降解动力学来验证催化剂的光催化活性.结果表明:在500℃下焙烧3 h后制得的催化剂为锐钛矿相,粒径在15~30 nm之间;与单一的V/TiO2不同,往纯TiO2中掺杂V/TiO2后,XPS测试中检测不出V2p的特征峰;光催化实验证实,当V/TiO2与纯TiO2处于一定比例时样品具有更高的催化效率.更多还原

【Abstract】 In order to improve the photocatalytic activity of TiO2,vanadium-doped TiO2 catalysts were synthesized in two modes by means of sol-gel method,and the products were characterized by using XRD,TEM,XPS and UV-Vis spectroscopy,whose photocatalytic activity was then evaluated by the photocatalytic degradation of methyl orange.The results show that the prepared V-doped TiO2 anatase is 15~30 nm in diameter after calcination at 500 ℃ for 3 h and different from primary V-doped TiO2.The characteristic peak of V2p can not be detected by XPS on the surface of V-doped TiO2 coated with pure TiO2.Moreover,it is verified by photocatalytic reaction that the catalysts possess higher photocatalytic efficiency when the mole ratio of V-doped TiO2 to pure TiO2 reaches a suitable value.更多还原