Ag@AgCl修饰TiO2-xCx光催化剂的制备及其可见光降解污染物性能

以钛酸丁酯和葡萄糖为原料用水热法制备了碳掺杂二氧化钛,再进一步对其进行Ag@AgCl表面修饰.用X射线衍射(XRD),X射线光电子能谱(XPS),透射电镜(TEM),BET比表面仪和紫外-可见(UV-Vis)漫反射光谱等手段对样品进行测试表征;在可见光辐射下(λ＞420 nm),以甲基橙和苯酚溶液的光催化降解实验来评价样品的活性.结果表明:经Ag@AgCl修饰后,样品的粒径增大,比表面积减小,对可见光的响应增强;可见光光催化效率有大幅度提高,对甲基橙和苯酚的降解效率分别是修饰前的5.5和3.4倍,且光催化剂经三次循环使用后活性基本保持不变.

Preparation of a Ag@AgCl-Modified TiO2-xCx Photocatalyst and Its Performance for Degradation of Pollutants under Visible Light

C-doped TiO2 was prepared from butyl titanate and glucose by a hydrothermal method.The prepared C-doped TiO2 was further modified with Ag@AgCl.The obtained samples were characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),transmission electron microscopy (TEM),BET surface area analysis,and UV-Vis diffuse reflectance spectroscopy.The photocatalytic activity of the samples was evaluated by the degradation of methyl orange and phenol under the visible light irradiation (λ>420 nm).After modification with Ag@AgCl,the C-doped TiO2 samples had a larger particle size and smaller surface area with enhanced response to visible light and greatly improved visible-light photocatalytic activity.The degradation rates of methyl orange and phenol over Ag@AgCl/TiO2-xCx were 5.5 and 3.4 times as large as those over TiO2-xCx,respectively.The photocatalytic activity of Ag@AgCl/TiO2-xCx under visible light remained almost unchanged after three cycles.