Abstract: TiO2 catalysts on glass fibres were prepared by the sol-gel method, and then 0.2% Fe3+ and Ce3+ were doped to modify the TiO2 photocatalysts.Experiments of the batch photocatalytic degradation of benzene were carried out, and the results indicated that Fe3+ and Ce3+ doping could improve the photocatalytic activity of the TiO2 catalysts, of which the 0.2% Fe3+/TiO2 photocatalyst was the best.XRD, SEM and XPS were used to analyze physical and chemical variation of TiO2 catalyst surfaces after Fe3+ and Ce3+ doping.The results showed that 40—60 nm size TiO2 anatase particles were deposited on glass fibre, the concentration of Ti3+was increased and the concentration of hydroxyl was decreased on the surface of photocatalysts which were doped 0.2% Fe3+ and Ce3+.Ti3+ could adsorb oxygen and react with oxygen to produce Ti4+ and O-2 simultaneously on the surface of photocatalysts.Oxidant O-2 plays an important role in the photocatalytic degradation process of benzene.

摘要： 采用溶胶-凝胶法在玻璃纤维上涂层TiO₂光催化剂，并掺杂Fe³⁺和Ce³⁺修饰TiO₂光催化剂，进行了间歇式光催化降解气相苯实验，结果表明掺杂Fe³⁺和Ce³⁺均可以提高TiO₂光催化剂的活性，其中0.2% Fe³⁺/TiO₂光催化剂活性最好.借助XRD、SEM和XPS等表征手段来分析修饰前后的催化剂表面的物理化学性质变化，研究表面性质的变化对于光催化性能的影响.表征结果显示载体玻璃纤维表面均匀分布了粒径为40～60 nm的锐钛型TiO₂微粒，0.2%Fe³⁺和Ce³⁺掺杂后催化剂表面Ti³⁺浓度增大，表面羟基浓度减小.催化剂表面的Ti³⁺会与被吸附氧气反应形成Ti⁴⁺并同时产生活性组分O^-₂，氧化剂O^-₂在光催化降解苯反应过程中起着重要作用.