Ag/Bi-TiO_2的制备及光催化气相甲苯性能的研究  

Photo-catalytic performance of Ag/Bi-TiO_2 composite for the degradation of gas-phase toluene

作　　者：李梦霞[1] 汪莉[1,2] 李鑫[1] 李哲[1] 贠丽 王振南[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京科技大学北京市工业典型污染物资源化处理重点实验室,北京100083

出　　处：《功能材料》2015年第13期13148-13152,共5页Journal of Functional Materials

基　　金：科技部纳米重大科学研究计划资助项目(2013CB932600)

摘　　要：采用溶胶-凝胶法制备Ag/Bi-TiO2光催化剂,通过XRD、SEM、BET及UV-VisDRS对催化剂进行表征,并对其可见光催化气相甲苯的活性进行了考察。结果表明,与纯TiO2相比,Ag/Bi-TiO2光催化剂的晶粒粒径减小,比表面积增大,同时Bi—O—Ti键以及Ag杂质能级的形成,拓宽了TiO2的光吸收范围,减少了光生电子-空穴的复合几率,提高TiO2的光催化活性。当焙烧温度为450℃时,0.001Ag/0.05Bi-TiO2光催化剂(n(Ag)/n(TiO2)=0.001,n(Bi)/n(TiO2)=0.05)对甲苯的降解效率能达到77.7%,比纯TiO2提高了72.6%。Ag / Bi-TiO2 were prepared by sol-gel method and characterized by XRD,SEM,BET and UV-Vis DRS. Meanwhile,its photo-catalytic capacity of the prepared Ag / Bi-TiO2 catalysts was investigated by gas-phase toluene under visible light. The results show that the Ag / Bi-TiO2 catalysts exhibited smaller crystallite sizes,larger specific surface areas than pure TiO2. Because of the formation of Bi—O—Ti band and Ag impurity level,the absorb range of solar light can be broaden,thus resulting in the enhanced visible light absorption performance of the Ag / Bi-TiO2 catalysts. In addition,the doped of Bi and Ag can reduce the recombination probability of the electron-hole pairs,which was beneficial to enhance photo-catalytic activity of TiO2. The maximum ratio of degradation of toluene can reach to 77. 7% when the calcination temperature was 450 ℃ and the quantity of the doped Ag was mole fraction 0. 1%,Bi was 5%,which was 72.6% higher than pure TiO2.

关 键 词：TIO2 AG BI 甲苯 光催化 

分 类 号：O643[理学—物理化学]