N掺杂二氧化钛空心球壳的可控制备及其可见光催化性能研究

Photocatalysis technology of TiO2 is an important method of treating refractory organic wastewater. Aiming at the poor activity of TiO2 in visible light, in this project we will report, the design and synthesis of N-doped TiO2 hollow nanospheres through a N-doped template-mediated process, and investigate the photocatalytic activities for the degradation of different organic pollutants under visible light. Starting from two aspects of the developing visible-light-active TiO2 photocatalysts and enhancing the activity of photocatalysts, doping with N and hollow structure will be gathered into TiO2 matrix by using N-doped phenolic-resin nanospheres as the template. A simple method for preparing structure controllable N-doped TiO2 hollow nanospheres will be developed. The influence preparation conditions on the morphology, composition, crystalline phase and microstructure of N-doped TiO2 hollow nanospheres will be studied. Further investigation will be made to explore the relation between the morphology, composition, crystalline phase, microstructure and catalytic perforemance, elucidating the structure-activity relationship and the synergistic effect of the doping with N and hollow structure on the activity of photocatalysts under visible light. Meanwhile, the adsorption, degradation and transformation behaviors of the target pollutants will be explored, verifying the degradatin mechanism of different organic pollution in N-doped TiO2 hollow nanospheres. The implementation of this project will solve the technical problems in the application of TiO2 in photocatalysis technology, and provide technical support for the efficient removal of refractory organic pollutants.

以TiO2为催化剂的光催化技术是处理难生物降解有机废水的重要方法。针对TiO2可见光催化活性差的不足，本项目提出直接采用含N源模板构筑N掺杂二氧化钛空心球壳，并开展其对不同有机污染物可见光催化性能的研究。从催化剂具有可见光响应和提高催化活性两方面出发，巧妙利用含N酚醛树脂球作为模板，将N掺杂和空心结构同时引入TiO2基体，发展一种操作简便且结构可控的制备N掺杂二氧化钛空心球壳的方法；阐明N掺杂二氧化钛空心球壳的形貌、组成、晶型及微结构的调变规律；考察其对光催化性能的影响，阐明构效关系，诠释N掺杂和空心结构对可见光催化性能的增效机理；探究目标污染物的吸附降解及其转化行为，揭示N掺杂二氧化钛空心球壳对不同有机污染物光降解机理。本项目的实施解决了TiO2在光催化技术应用中面临的技术难题，为水中难降解有机污染物的高效去除提供技术支撑。

以TiO2为催化剂的光催化技术是处理难生物降解有机废水的重要方法。针对TiO2可见光催化活性差的不足，本项目先后发展了中空二氧化钛球壳、碳/二氧化钛复合材料和N掺杂二氧化钛三种催化剂材料的可控制备，并开展其对不同有机污染物的光催化性能研究。研究表明，中空结构，碳材料的引入和N掺杂均有利于提高催化剂材料的光催化性能。本项目主要考察了壁厚、煅烧温度、N掺杂量、晶型、微结构等对光催化性能的影响，阐明构效关系，诠释空心结构、碳复合和N掺杂对光催化性能的增效机理。通过对催化剂材料的可控制备，实现了对不同催化剂材料性能的优化；通过对不同污染物的应用研究，实现了催化剂对多种污染物的无选择性催化降解。本项目的实施解决了TiO2在光催化技术应用中面临的技术难题，为水中难降解有机污染物的高效去除提供技术支撑。