摘要
用光沉积法制备Ag/TiO2和Pd/TiO2催化剂样品,然后用表面光电压谱(SPS)和紫外可见吸收光谱(UV-Vis)对样品进行表征。以气态庚烷为反应体系,来比较上述两种催化剂的光催化活性。与纯TiO2比较,Ag和Pd的存在提高了TiO2的光催化活性;其原因可解释为金属Ag或Pd捕获电子,从而提高了电子-空穴对的分离效率;结果还表明与Pd/TiO2催化剂相比,Ag/TiO2表现出较高的光催化活性,这主要是Ag比Pd具有较强的捕获电子的能力。
Ag/TiO2 and Pd/TiO2 samples were prepared by photodeposition, and then characterized by SPS and UV-Vis absorbance spectroscopy. The photocatalytic reactivity of the samples were tested by the gas-phase photocatalytic oxidation of heptane. The presence of metallic silver or palladium provides TiO2 higher photocatalytic activity. The possible explanation could be the increase of the electron-hole pair separation efficiency induced by metallic silver or palladium. Moreover, Ag/TiO2 has higher photoactivity than Pd/TiO2. The difference could be due to the fact that Ag has higher work-function than Pd.
出处
《北京联合大学学报》
CAS
2005年第4期46-49,共4页
Journal of Beijing Union University
基金
北京市教委基金资助项目(KM200311417141)
作者简介
刘洋(1972-),女,山东诸城人,北京联合大学应用文理学院讲师,理学硕士,在读博士研究生,从事环境能源材料的研究;尚静(1973-),女,吉林通化人,北京大学环境学院副教授,理学博士,从事环境光化学的研究。