铁掺杂TiO2纳米粒子光催化氧化庚烯的研究

采用新的合成路线制得掺铁TiO₂纳米粒子， 通过光催化降解庚烯研究其气固复相光催化性能， 用XRD, UV-vis和XPS等方法研究了掺铁TiO₂纳米粒子的晶体结构、 光吸收特性及表面化学形态. TiO₂纳米粒子掺杂Fe³⁺后， TiO₂的光吸收阈值发生红移， 向可见光区拓展； Fe³⁺掺杂浓度和焙烧温度对掺铁TiO₂纳米粒子的气固复相光催化降解活性有很大影响， 实验结果表明， 掺铁量为0.5%(摩尔分数)， 焙烧温度300 ℃时光催化降解活性最好.

Studies of the Photocatalytic Activity of Heptylene over Iron-doped TiO2 Nanoparticles

Iron-doped TiO₂ nanoparticles were prepared via a new synthetic route.　The photocatalytic activity was examined by the photocatalytic degradation of heptylene.　The effects of iron dopant on the crystal structure, absorption character of light and chemical feature of the surface were studied by XRD， UV-vis and XPS techniques respectively.　The results indicate that the iron doping enlarges the absorption band of visible light of pure TiO₂, thus the efficiency of absorption of light is increased. The amount of iron dopant and the calcination temperature have a great effect on the photocatalytic activity of iron-doped TiO₂ nanoparticles.　The highest photocatalytic activity of iron-doped TiO₂ nanoparticles is the highest when the molar ratio of Fe to Ti is 0.5% and the calcination temperature is 300 ℃.