TiO_2纳米晶表面羟基自由基的生成对光催化性能的影响  

Effect of the photoinduced hydroxyl radicals of TiO_2 nanoparticles on the photocatalytic performance

作　　者：侯乙东[1] 李旦振[1] 付贤智[1] 刘平[1] 王绪绪[1] 

机构地区：[1]福州大学光催化研究所,福建福州350002

出　　处：《福州大学学报（自然科学版）》2004年第6期747-750,共4页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20473018;20273014);福建省自然科学基金重大项目(2003F004);福建省教育厅重点项目(JA02138)

摘　　要：采用溶胶-凝胶法制备纳米TiO2.用X射线衍射谱(XRD)测定了TiO2粒子的晶相结构;以对苯二甲酸作为探针分子,结合化学荧光技术研究了TiO2表面羟基自由基的生成;以降解罗丹明B(RhB)为模型反应,考察了TiO2粒子的光催化活性.结果表明,TiO2粒子的晶相结构对其羟基自由基的生成和光催化活性产生显著影响;羟基自由基的生成速率越大,光催化活性越高.By means of X-ray diffraction (XRD) and photo-degradation of Rhodamine-B (RhB), the crystalline structure and photocatalytic activity of the TiO_2 prepared by sol-gel method were studied, and the active oxidative species (·OH) produced in the supernatant liquid of the irradiated TiO_2 suspension containing terephthalic acid were also investigated by measuring the fluorescence derived by the reaction with terephthalic acid. It was found that the formation rate of ·OH and the photocatalytic efficiency were greatly influenced by the crystalline structure of TiO_2. The results also indicated that the greater the formation rate of ·OH was, the higher photocatalytic activity of TiO_2 was achieved.

关 键 词：二氧化钛 光催化 羟基自由基 荧光 

分 类 号：O643[理学—物理化学]