TiO2纳米粒子的结构、表面特性及其光催化活性研究

采用金属醇盐水解法制备了TiO2纳米粒子，并用XRD、SPS、XPS和ESR等测试手段对TiO2粒子进行结构、性能测试、随焙烧温度的增加，TiO2粒子长大，晶型由锐钛矿向金红石型转变。以庚烷的气相光催化氧化为试验反应，考察不同温度处理的醇洗、水洗TiO2粒子的光催化活性。结果表明，醇洗粒子较水洗粒子显示出高的光催化活性，并且低温处理的粒子其光伏响应带边蓝移明显，并值增加，Ti^3＋含量较高，光催化活性增加。

Structure, Surface Properties and Photocatalytic Activity of TiO2 Nanoparticles

TiO₂ nanoparticles were prepared by the hydrolysis of titanium alkoxide. The properties of the particles were characterized by XRD, SPS, XPS and ESR techniques. The particle size of the TiO₂ increased as the calcining temperature increased and the structure of the TiO₂ changed from anatase to rutile. The photocatalytic oxidation of heptane was used as model reaction to measure the photocatalytic activity of TiO₂ particles. The photocatalytic activity of TiO₂ particles washed with ethanol is higher than that of TiO₂ particles washed with water. The lower calcining temperature induces the blue-shift of photovoltage, the threshold higher, and the content of Ti³⁺ higher, which help to enhance the photocatalytic activity of TiO₂ particles.