纳米TiO_2气相光催化氧化苯胺的研究(Ⅰ)  

Gas-Phase Photocatalytic Oxidation of Aniline with nano-TiO_2(Ⅰ)

作　　者：李瑛[1] 钟家柽[1] 

机构地区：[1]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《武汉大学学报（理学版）》2005年第2期145-148,共4页Journal of Wuhan University:Natural Science Edition

基　　金：湖北省科技攻关计划资助项目(2004AA101C34)

摘　　要：以水玻璃为粘贴剂,稀硫酸溶液为固化剂,采用涂膜法在玻璃纤维布上制备了TiO2复合膜,并用扫描电子显微镜(SEM)观察了其表面形貌.用纳米TiO2 复合膜作催化剂对大气环境中苯胺的气相光催化氧化进行了研究,考察了催化剂浓度、苯胺的初始浓度、水蒸气等因素对气态苯胺降解率的影响,并用傅立叶变换红外(FT IR)光谱法分析了光催化反应中降解的产物.气相光催化苯胺后的实验结果表明:催化剂表面因中间产物的吸附导致失活,而采用把催化剂放置在太阳光下数日或用紫外灯光照一段时间便可使催化剂活性得到恢复.The gas-phase photocatalytic oxidation of aniline on a new kind of nano-TiO_2 composite films was investigated. The composite film was prepared on glass fibre with the water glass as binders and dilute H_2SO_4 solution as solidifying reagent, whose surface characters was observed by scanning electron micrograph (SEM). The photocatalytic degradation of aniline on the composite films was carried out in TiO_2/UV system. Some important factors affecting the photodegradation were also studied such as the concentration of TiO_2, the initial concentration of aniline, and water vapour existing. The product of Photocatalytic oxidation was detected by FT-IR. The partial intermediate products were absorbed on TiO_2 surface, which resulted in catalyst deactivation. But when it was irradiated under UV-illumination or solar irradiation for some time, the catalyst could be reused without the loss of catalytic activity.

关 键 词：纳米TiO2复合膜 气相光催化氧化 水玻璃 玻璃纤维 苯胺 

分 类 号：O643.3[理学—物理化学]