Structure, Surface Properties and Photocatalytic Activity of TiO2 Nanoparticles
TiO2纳米粒子的结构、表面特性及其光催化活性研究

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.