铁掺杂TiO_2纳米粒子光催化氧化庚烯的研究

Studies of the Photocatalytic Activity of Heptylene over Iron-doped TiO_2 Nanoparticles

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.

Iron-doped TiO_2 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 TiO_2, 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 TiO_2 nanoparticles. The highest photocatalytic activity of iron-doped TiO_2 nanoparticles is the highest when the molar ratio of Fe to Ti is 0.5% and the calcination temperature is 300 ℃.