TiO_2纳米粒子的表面光电压与光催化活性的关系  

Relationship between SPV and photocatalytic activity of modified TiO_2 nanoparticles prepared by different methods

作　　者：辛柏福[1] 王鹏[1] 任志宇[2] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090 [2]黑龙江大学化学化工与材料学院,哈尔滨150080

出　　处：《哈尔滨工业大学学报》2008年第7期1121-1124,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(20431030);黑龙江省教育厅科学技术研究重点资助项目(1152Z002);哈尔滨市科技局青年科技创新人才专项资金资助项目(2006RFQXS096);黑龙江大学杰出青年基金资助项目(2005)

摘　　要：为了研究不同改性催化剂的SPS信号强度变化的原因及其与光催化活性之间的关系.文中制备了三种光催化剂:表面沉积贵金属银的Ag-TiO2纳米粒子、不同pH条件下水热法制备的TiO2纳米粒子、过渡金属铁离子掺杂的Fe-TiO2纳米粒子,并利用SPS技术分析了所制备催化剂光生电子-空穴的分离效率.实验结果表明:对于Ag-TiO2体系,表面光电压信号越弱,光催化活性越高;而对于水热法制备的TiO2体系和Fe-TiO2体系,则是表面光电压信号越强,光催化活性越高.所制备光催化剂的SPS信号强度变化与其光生载流子的分离及复合机制必然有着联系,因此可利用SPS分析技术快速评价催化剂的活性.In order to investigate the reasons of SPS intensity variation with different modified photocatalysts and the relationship between the photocatalytic activity and the intensity of SPS spectra, three different photocatalysts were prepared： Ag-TiO2 nanoparticles with the deposited noble metal Ag on the surface of TiO2, TiO2 nanoparticles prepared by hydrothermal method in different mediums and Fe-TiO2 nanoparticles with overdoped Fe3＋ in TiO2. As-prepared catalysts were mainly tested by SPS. Experimental results indicate that for Ag-TiO2 system, the lower is the intensity of SPS response, the higher is the photocatalytic activity; and for TiO2 systems synthesized by hydrothermal method and Fe-TiO2system, the stronger is the intensity of SPS respons, the higher is the photocatalytic activity. This fact is closely associated with the mechanism of photoinduced carriers separation and recombination. So the activity of photocatalysts may be quickly estimated by SPS measurements.

关 键 词：二氧化钛 表面光电压谱 光催化 水热 铁掺杂 银沉积 

分 类 号：O643[理学—物理化学]