以梳型聚合物为模板制备介孔Ag/AgBr/TiO2纳米复合材料
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国家自然科学基金(21271061);河北省自然科学基金(B2014208103)


Preparation of mesoporous Ag/AgBr/TiO2 nanocomposites with comb-type polymer as template
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    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346 m2/g减小为253 m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。

    Abstract:

    The mesoporous TiO2 nanocomposites were fabricated in a water bath at lower temperatures using the sol-gel method 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 visible light photocatalytic 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.

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徐 莉,罗青枝,王德松,张鑫鑫,李 磊.以梳型聚合物为模板制备介孔Ag/AgBr/TiO2纳米复合材料[J].河北科技大学学报,2015,36(1):23-29

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  • 收稿日期:2014-10-20
  • 最后修改日期:2014-11-23
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  • 在线发布日期: 2015-01-22
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