【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.更多还原

【Abstract】 By means of X-ray diffraction （XRD） and photo-degradation of Rhodamine-B （RhB）, the crystalline structure and photocatalytic activity of the TiO₂ prepared by sol-gel method were studied, and the active oxidative species （·OH） produced in the supernatant liquid of the irradiated TiO₂ 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 TiO₂. The results also indicated that the greater the formation rate of ·OH was, the higher photocatalytic activity of TiO₂ was achieved.更多还原