钛基催化剂光催化去除大气环境NO过程中副产物的形成机制与消除

项目名称： 钛基催化剂光催化去除大气环境NO过程中副产物的形成机制与消除

项目编号： No.21207145

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： 马金珠

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： 光催化技术作为一种"绿色"技术广泛应用于大气和水体污染物的净化，利用光催化技术去除大气环境中低浓度的NO近期引起研究者的关注。目前文献报道的各种光催化剂能在可见光下较好的去除大气环境中的NO。但是有文献报道光催化去除NO过程中存在副产物NO2或者HONO的释放，会对环境造成二次污染。研究光催化去除NO过程中副产物的形成机制与抑制方法具有重要的意义。本项目拟从消除副产物的角度出发，通过改变制备方法、优化制备条件以及与其他强吸附能力材料复合，抑制副产物的释放，提高钛基催化剂的活性和选择性，制备可见光响应的高效稳定环境友好的光催化剂；采用多种原位和离位表征手段，建立催化剂在光催化NO氧化反应中的构效关系，明晰NO光催化去除过程中副产物的形成与消除机制，进一步指导催化剂的设计合成；利用烟雾箱评价在接近真实大气环境条件下光催化剂净化NO的效果，为环境光催化材料的实际应用提供基础数据。

中文关键词： 钛基催化剂；可见光；光催化；一氧化氮去除；副产物

英文摘要： Semiconductor photocatalysis, as a "green" technology, has been widely used to treat polluted air and water. Many researchers focus their efforts on the photocatalytic removal of atmospheric NO at low concentrations (at ppb levels). Photocatalyst reported in reference can be used to remove atmospheric NO at low concentrations, however, NO2 or HONO, as the byproducts of visible light photocatalytic removal of NO, may be released to atmospheric environment and caused secondary pollution. It is significant to investigate the formation mechanism and inhibition of byproducts of photocatalytic removal of NO. In this project, some methods will be taken to improve the activity and selectivity of the Ti-based photocatalyst. The byproducts can be eliminated through these methods, such as optimize the preparation methods and conditions, composite other materials with Ti-based photocatalyst. Visible light active, highly efficient, chemical inertness and environmental friendly photocatalyst will be prepared and used for NO removal. The structure activity relationship and reaction mechanism of the photocatalytic removal of NO will be revealed by several in situ and non in situ methods. These results will be further direct the design of photocatalyst. The efficiencies of photocatalytic removal of NO under near real atmospheric

英文关键词： Ti-based catalyst；visible light；photocatalysis；NO removal；by products