以梳型聚合物为模板制备介孔Ag／AgBr／TiO2纳米复合材料

以钛酸四丁酯为钛源，梳型聚合物为模板，采用溶胶一凝胶法低温水浴制备具有介孔结构的纳米TiO2，通过沉积一沉淀法将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346m^2／g减小为253m^2／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Ti...

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Bibliographic Details
Published in河北科技大学学报 Vol. 36; no. 1; pp. 23 - 29
Main Author 徐莉 罗青枝 王德松 张鑫鑫 李磊
Format Journal Article
LanguageChinese
Published 河北科技大学理学院,河北石家庄,050018 2015
Subjects
Ag／AgBr
Ag／AgBr／TiO2
介孔材料
可见光催化剂
纳米复合材料
高分子物理化学
Ag/AgBr
polymer physical chemistry
可见光催化剂
visible light photocatalyst
高分子物理化学
介孔材料
mesoporous materials
纳米复合材料
Ag/AgBr/TiO2
nanocomposites
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ISSN1008-1542
DOI10.7535/hbkd.2015yx01006

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Summary:以钛酸四丁酯为钛源，梳型聚合物为模板，采用溶胶一凝胶法低温水浴制备具有介孔结构的纳米TiO2，通过沉积一沉淀法将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346m^2／g减小为253m^2／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TiO2 P25和介孔TiO2的145倍和60倍。
Bibliography:polymer physical chemistry; Ag/AgBr; Ag/AgBr/TiO2; mesoporous materials; nanocomposites; visible light photocatalyst
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 me
ISSN:1008-1542
DOI:10.7535/hbkd.2015yx01006