半导体氧化物纳米晶的晶面、缺陷调控及其对光热协同催化净化VOCs性能的影响

项目名称： 半导体氧化物纳米晶的晶面、缺陷调控及其对光热协同催化净化VOCs性能的影响

项目编号： No.21273169

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： 李远志

作者单位： 武汉理工大学

项目金额： 80万元

中文摘要： 纳米光催化剂广泛用于水中有机污染物的催化净化，但在气相光催化净化挥发性有机物（VOCs）中催化净化效率较低和易失活是其用于室内空气污染物治理面临的巨大挑战。本项目将光催化和热催化有机结合，依据我们前期工作发现的纳米TiO2和CeO2高效光热协同催化新效应，以及晶格氧参与反应的光热协同催化新机理，提出研究具有不同晶面取向的半导体氧化物纳米晶（如：TiO2、CeO2、ZnO等）及其复合物的可控制备、缺陷调控及光热协同催化净化VOCs性能。本项目的特色是采用正电子湮灭谱表征缺陷，研究晶面取向、体相/表面（或界面）缺陷，对半导体氧化物纳米晶及其复合物的光生电子和空穴的分离效率、光热协同催化净化活性和稳定性的影响规律；研究这些催化剂具有优良光热协同催化稳定性的机制。本项目将为VOCs的高效治理提供催化净化新方法和催化材料设计新原理，解决光催化剂在VOCs治理中存在的净化效率低和易失活等关键科学问题。

中文关键词： 光催化；热催化；光热协同催化；纳米结构；氧化物

英文摘要： Nano photocatalysts have been widely used in the photocatalytic purification of organic pollutants in water,but their low photocatalytic efficiency and quick deactivation in the gas-phase photocatalytic purification of volatile organic compounds(VOCs) are great challenge for their application in the purification of indoor air pollutants. In this project,photocatalytis and thermocatalysis are to be perfectly combined together. According to the novel synergetic photothermocatalytic effect and novel photothermocatalytic mechanism of lattice oxygen involving reaction on nano TiO2 and CeO2,which have been found in our prevoius works,we propose to investigate the controllable preparation，defect tuning and synergetic photothermoatalytic VOCs purification of semiconduction oxide nanocrystals (e.g.TiO2,CeO2,ZnO, etc.) and their composites. The characteristics of the project are to characterize defects with positron annihilation, and study the effect of crystal facets, bulk/surface(or interface) defects on the separation efficiency of photogenerated electrons and holes,photothermocatalytic activity and durability of semiconduction oxide nanocrystals and their composites. We will study the mechanism why the semiconduction oxide nanocrystals and their composites exihibit excellent photothermocatalytic duribility. The pro

英文关键词： photocatalytic；thermocatalytic；photothermocatalytic；nanostructured；oxide