可见光响应磁回收光催化剂的可控制备，失活及再生机理研究

The toxic organic pollutants are photodegraded by semiconductors is one of the challenging tasks in ecological and environmental protection. According to the development status of semiconductor-based photocatalyst and combining with the latest progress in our group, we propose to controllable synthesis the iron oxides (Fe2O3, Fe3O4, etc.)-noble metal (Au, Ag, etc.)-wide-bandgap semiconductors (TiO2, SnO2, ZnO, etc.) composite magnetic recovery photocatalysts (MRPs). This system have introduced magnetic iron oxides and noble metal for fabricating the MRPs with good magnetic separate responsive, visible-light driven properties and stability. In this project, we will tailor the structure of the composite materials, analyze the influence mechanism of photogenerated electron-hole separate rate and the utilization efficiency of visible light by the different binding mode of interface and surface, mainly study the deactivation mechanism, regeneration technology and related mechanism, and finally construct a visible light responsive, high efficiency, stable and low cost of magnetic recovery photocatalytic materials or systems. Such materials can be effectively break through the bottleneck (lower activity under visible light and difficult to be recycled from the products), and may be exploited as a important visible light responsive MRPs with a bright future.

利用半导体光催化降解有毒有机污染物是当今生态环境保护的重要发展方向之一。针对国内外半导体基光催化材料的发展现状，结合本课题组在光催化研究方面的最新进展，本项目提出开展形貌可控的铁氧体（Fe2O3、Fe3O4等）-贵金属（Au、Ag等）-宽带隙半导体（TiO2、ZnO等）三元复合磁回收光催化纳米材料的合成，催化失活和再生机理研究。引入磁性铁氧体和贵金属，合成具有良好磁分离响应性、可见光响应和稳定的高效磁回收光催化剂。采用实验与理论计算相结合方式，对复合材料的结构进行有效调控，分析界面与表面结合方式对材料光生电子空穴对分离效率和可见光利用率的影响机制，重点研究复合光催化体系的失活机理和磁回收后的再生方法和机理，探索可见光响应、高效、稳定、低廉的磁回收光催化复合材料或体系。该类材料可有效地突破半导体氧化物只吸收紫外光和难以从产物中分离回收再利用等难题，具有光明的应用前景。

利用半导体光催化降解有毒有机污染物是当今生态环境保护的重要发展方向之一。本项目开展了形貌可控的磁性铁氧体-贵金属-宽带隙半导体三元复合磁回收光催化纳米材料的制备，光催化应用和催化机制，催化失活和再生机理研究。采用了实验与理论计算相结合的方式，对复合光催化材料的结构进行了有效调控，分析了界面与表面结合方式对材料光生电子空穴对分离效率和可见光利用率的影响机制。该类材料可有效地突破半导体氧化物只吸收紫外光和难以从产物中分离回收再利用等难题，具有光明的应用前景。本项目的开展严格按照研究计划执行，执行情况良好。研究工作主要集中于铁氧体/半导体复合光催化材料的构筑和光催化应用研究，项目执行顺利，取得了较为丰富的研究成果，项目执行期间，以第一作者或通讯作者在SCI检索期刊共发表SCI论文22篇。