Fe^(3+)-TiO_2/SiO_2负载型光催化剂降解气相中甲苯研究

Study on photocatalytic degradation and kinetics of toluene in gas phase using Fe^(3+)-TiO_2/SiO_2

用浸渍法制备了Fe3+-TiO2/SiO2负载型光催化剂并进行了光催化降解气相中甲苯的实验研究。结果表明,Fe3+掺杂量(nFe3+/Ti4+)为0.3%时光催化降解甲苯的效率最高。水气的存在提高了Fe3+-TiO2/SiO2负载型催化剂的光催化活性,但使Fe3+-TiO2纳米粉的光催化活性降低;而O2的存在使Fe3+-TiO2纳米粉和Fe3+-TiO2/SiO2负载型催化剂的催化活性均有所降低。动力学研究表明,光催化降解气相中甲苯的动力学为一级反应。

Photocatalytic degradation of toluene using Fe 3+-TiO_2/SiO_2 thin film photocatalysts prepared by means of impregnation method has been performed in gas phase. The photocatalytic activity of prepared catalysts reach the maximum at the optimal content n_ Fe 3+/n_ Ti 4+=0.3%. With increasing water vapor concentration, the photocatalytic activity of Fe 3+-TiO_2/SiO_2 increases, while TiO_2 nanoparticles activity declines. For both them, the presence of O_2 results in photocatalytic activity decrease. The experimental results indicate that the kinetics of toluene degradation can be described by one-order reaction equation.