以梳型聚合物为模板制备介孔Ag/AgBr/TiO_2纳米复合材料  

Preparation of mesoporous Ag/AgBr/TiO_2 nanocomposites with comb-type polymer as template

作　　者：徐莉[1] 罗青枝[1] 王德松[1] 张鑫鑫[1] 李磊[1] 

机构地区：[1]河北科技大学理学院,河北石家庄050018

出　　处：《河北科技大学学报》2015年第1期23-29,共7页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(21271061);河北省自然科学基金(B2014208103)

摘　　要：以钛酸四丁酯为钛源,梳型聚合物为模板,采用溶胶-凝胶法低温水浴制备具有介孔结构的纳米TiO2,通过沉积-沉淀法将Ag/AgBr负载于介孔TiO2纳米微粒表面,制得高比表面积的Ag/AgBr/TiO2纳米复合材料。采用XRD,TEM,N2吸附-脱附和UV-vis DRS等方法对Ag/AgBr/TiO2纳米复合材料进行了表征。结果表明,所制备的纳米TiO2和Ag/AgBr/TiO2纳米复合材料具有介孔结构;Ag/AgBr的引入,减小了介孔TiO2的比表面积(由346m2/g减小为253m2/g),但大幅度提高了其可见光催化活性。在可见光下,Ag/AgBr/TiO2降解甲基橙的速率分别为商品TiO2P25和介孔TiO2的145倍和60倍。The mesoporous TiO2 nanocomposites were fabricated in a water bath at lower temperatures using the sol-gel meth- od with a comb-type polymer as template and tetrabutyl titanate as Ti source. The Ag/AgBr/TiO2 nanocomposites with higher specific surface areas were obtained by the introduction of Ag/AgBr on the surface of the mesoporous TiO2 using a deposition- precipitation method. The as-prepared nanocomposites were characterized by X-ray diffraction （XRD）, N2 sorption analysis, transmission electron microscope （TEM） and UV-vis diffuse reflectance spectroscopy （UV-vis DRS）. The results showed that both the as-prepared TiO2 and Ag/AgBr/TiO2 exhibited mesoporous structure. The introduction of Ag/AgBr not only decreased the specific surface area of the mesoporous TiO2 from 346 m^2/g to 253 m^2/g, but also significantly increased its visi- ble light pbotocatalytic activity. The degradation rate of methyl orange under visible light irradiation over Ag/AgBr/TiO2 was 145 and 60 times of those over the commercial TiO2 P25 and the mesoporous TiO2, respectively.

关 键 词：高分子物理化学 Ag/AgBr Ag/AgBr/TiO2 介孔材料 纳米复合材料 可见光催化剂 

分 类 号：O649.4[理学—物理化学]