二氧化钛/溴化银-银/导电聚合物纳米复合材料的制备及可见光催化机理的研究

项目名称： 二氧化钛/溴化银-银/导电聚合物纳米复合材料的制备及可见光催化机理的研究

项目编号： No.21271061

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 王德松

作者单位： 河北科技大学

项目金额： 75万元

中文摘要： TiO2是一种性能优异的光催化剂，在催化降解大气及水体有机污染物方面表现出了较好的应用前景，但较弱的可见光催化活性限制了其广泛应用。本研究拟采用溶胶凝胶法、原位沉淀法和原位聚合法制备TiO2/AgBr-Ag/导电聚合物纳米复合材料，利用AgBr的光敏性提高TiO2的可见光响应性，利用导电聚合物的电子输运性有效降低复合材料内光生电子还原银离子的几率和光生电子/空穴的复合几率，得到高效稳定的TiO2/AgBr-Ag/导电聚合物可见光催化剂。以甲基橙、苯酚等为模型有机污染物，考察该纳米复合材料可见光催化活性及稳定性，建立其组成-结构-可见光催化活性间的内在关系，揭示其在可见光下光生电子/空穴的生成历程及电子在复合材料内部的传导机制、催化活性中心的种类及生成机理、有机污染物可见光催化降解的反应历程，为高性能可见光催化剂的研制和有机污染物的高效降解提供理论依据。

中文关键词： 二氧化钛；溴化银；导电聚合物；可见光催化剂；纳米复合材料

英文摘要： TiO2, as an excellent photocatalyst, has been widely used in many application fields such as the decomposition of the organic contaminants in air and water. However, the low visible light photocatalytic activity doesn't favor its application in more fields. In this study, the TiO2/AgBr-Ag/conducting polymer nanocomposites will be prepared by the methods of sol-gel, in-situ deposition reaction and in-situ polymerization. The visible light response of TiO2 can be improved by the sensitization of AgBr while both the reduced probability of Ag+ by the photogenerated electrons in the nanocompostes and the recombination probability between the electrons and holes photogenerated in the nanocomposites can be decreased by the electron conducting property of the investigated conducting polymers. Therefore, the visible light photocatalyst TiO2/AgBr-Ag/conducting polymer with high photocatalytic activity and stability can be prepared by compounding TiO2, AgBr, Ag and conducting polymer. The visible light photocatalytic activity and stability of these nanocomposites will be investigated by evaluating the decomposition of the model organic contaminants such as methyl orange and phenol. The relationship among their chemical composition, micro-structure and visible light photocatalytic activity will be investigated and their vis

英文关键词： titanium dioxide；silver bromide；conducting polymer；visible light photocatalyst；nanocomposite