3D分等级中晶TiO2在降解POPs时的应用及构效关系研究

项目名称： 3D分等级中晶TiO2在降解POPs时的应用及构效关系研究

项目编号： No.21207148

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 环境化学

项目作者： 李国良

作者单位： 中国科学院生态环境研究中心

项目金额： 28万元

中文摘要： 3D分等级中晶材料具有高结晶度、大比表面积、高孔隙度和纳米与微米二级尺寸等特征，能够克服低维度材料易团聚而活性下降等难题，是当前光催化研究的热点内容之一。本项目拟通过非模板自组装的方法制备具有3D分等级新颖结构的中晶TiO2，评价其在POPs降解应用中的功效，重点探讨材料结构与降解效率之间的关系，为合成出具有高活性和广阔应用前景的TiO2光催化剂提供方法和理论支持。材料的晶型结构（纯态和混晶）通过调节退火温度控制；材料的{001}晶面比例通过晶面稳定剂的选择和添加量调控。结合3D分等级中晶TiO2反应前后理化性质表征结果、POPs理化性质和降解效率数据，系统讨论材料的体相形貌结构和晶体机构对POPs光降解的影响。该项目是属于纳米科学、环境化学和催化化学等领域的跨学科研究工作。

中文关键词： 3D分等级；二氧化钛；有机污染物；降解；构效关系

英文摘要： 3D hierarchical mesocrystals have advantages of particular morphology, high crystallinity, high surface area, high porosity and superstructure of both nanoscale and microscale. They are becoming a research hotspot due to their resistance to aggregation and decline of reactivity. In this study, we aim to synthesize a series of novel mesocrystal TiO2 catalysts exhibiting 3D hierarchical superstructure through simple and convenient self-assembly method without template, and to evaluate their usability in degradation of POPs. Particularly, the relation between structure and efficiency will be emphasized. The study is supposed to supply approaches and theory support to synthesis of TiO2 photocatalysts of high activity and good prospect. Products of pure crystal phase and polymorphs will be prepared through adjusting the annealing temperature. Appropriate crystallographic controlling capping agent will be chosen and added in proportion to adjust the proportion of the {001} facet exposed. Characterization of the physical and chemical properties of the catalysts and their specialties and capability in degrading POPs will be performed to deduce the relation between structure and catalytic efficiency of the novel catalysts. This study is an interdisciplinary research of nanomaterial science, environmental science and cata

英文关键词： 3D hierarchical；titania；organic pollutant；degradation；relation between structure and efficiency