掺杂改性TiO2 /AC的制备及气相甲苯降解性能研究

以钛酸丁酯为前驱体，采用溶胶-凝胶法制备了Fe、N离子共掺杂的TiO2/AC和TiO2/ACF负载型光催化剂，采用SEM、XRD、UV-Vis分光光度计等分析方法对催化剂样品进行了表征。选取甲苯为室内气相空气污染物的模型化合物进行光催化降解实验，探讨了催化剂制备过程中离子掺杂量、抑制剂种类、焙烧温度以及载体等对光催化剂活性的影响。结果表明, 催化剂在ACF上的分散效果优于AC上，制备的光催化剂均以锐钛矿相存在，Fe、N离子共掺杂实现了光催化剂在可见光区和紫外光区的双增强；以冰醋酸为抑制剂、离子掺杂量分别为N 8%和Fe 8%，ACF为载体，500 ℃下焙烧2 h所得TiO2/ACF光催化剂对气相甲苯的降解活性最高。

Preparation of TiO2/AC co-doped with nitrogen and iron(Ⅲ) and their photocatalytic activities for gas phase toluene degradation

By using butyl titanate as precursor, nitrogen and iron(Ⅲ) as doping ions, and activated carbon (AC) and activated carbon fiber (ACF) as support, composite catalysts TiO2/AC and TiO2/ACF were synthesized via a sol-gel method. The prepared photocatalysts were characterized by various techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV–visible absorption spectra. The influence of ion co-doping amount, inhibitor species, calcination temperature, and carriers on loaded TiO2 catalyst was discussed by using toluene as a model contamination. The results indicate that the dispersive effect of photocatalyst on ACF is better than on AC, the crystal form of photocatalyst prepared is anatase phase, the edge energy is improved and a significant rise of the photon absorbing intensity was observed; and that the optimal ion doping amount for nitrogen and iron are N 8% and Fe 8%, respectively when acetic acid was used as an inhibitor and ACF as carrier, and catalyst sample was calcined at 500℃ for 2 h.