介孔氧化钛晶须气相光催化降解三氯乙烯  

Gas Phase Photocatalytic Oxidation of Trichloroethylene on Mesoporous TiO_2 Whiskers

作　　者：张建平[1] 李东[1] 方维[1] 刘畅[1] 杨祝红[1] 陆小华[1] 

机构地区：[1]南京工业大学材料化学工程国家重点实验室,江苏南京210009

出　　处：《过程工程学报》2009年第1期171-175,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学重点基金资助项目(编号:20736002);国家高技术研究发展计划(863)基金资助项目(编号:2006AA032455);国家自然科学青年基金资助项目(编号:20706028);江苏省科技计划基金资助项目(编号:BG2007051)

摘　　要：以水合氧化钛和K2CO3为原料合成了介孔TiO2晶须,表征结果显示,其为锐钛矿型,具有微米级形貌和较高的比表面积和均匀的孔径.在波长为365nm的紫外光下光催化降解三氯乙烯(TCE),介孔TiO2晶须对TCE的降解率达到95%,高于Degussa P-25TiO2粉末对TCE的降解率(87%),具有更高的光催化氧化活性,降解速率随TCE初始浓度升高而加快,当空气流速为1.64cm/s时转化速率最高,其中氧气加快了光催化反应,光催化反应符合Langmuir-Hinshelwood动力学方程.Anatase TiO2 whiskers were synthesized by the reaction of TiO2·nH2O and K2CO3. The analytical results showed that the product was anatase with the sizes within microns, high ratio of area to mass and good uniformity in apertures. The photocatalytic activity of mesoporous TiO2 for the oxidation of trichloroethylene （TCE） in gas phase was studied under irradiation of UV lamp at 365 nm wavelength. Its degradation rate was up to 95% catalyzed by mesoporous TiO2, which was higher than that of Degussa P-25 TiO2 （87%）. The degradation rate of TCE was accelerated with increasing the initial concentration, which reached the highest rate when the air velocity was 1.64 era/s, and O2 boosted the photocatalytic reaction rate. Finally, Langmuir-Hinshelwood model was used to describe the photocatalytic reaction.

关 键 词：介孔TIO2 气固相光催化 三氯乙烯 

分 类 号：O643.32[理学—物理化学]