TiO2-Ag-Bi2MO6 (M=W, Mo) Z型光催化体系的构筑及其催化增效机制

项目名称： TiO2-Ag-Bi2MO6 (M=W, Mo) Z型光催化体系的构筑及其催化增效机制

项目编号： No.21501137

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 程刚

作者单位： 武汉工程大学

项目金额： 25万元

中文摘要： 本项目借鉴自然界Z型光合作用系统中电子和空穴有效分离和传递的特性，选用TiO2和Bi2MO6（M=W, Mo）两种不同半导体材料和电子介体Ag纳米颗粒来构筑人工Z型光催化体系，实现光生电子-空穴的有效分离，并分别保持空穴和电子的强氧化和强还原能力，进而提高其光催化性能。通过研究光催化体系中TiO2和Bi2MO6的微观形貌与结构、Ag颗粒尺寸以及各组分的比例对体系催化性能的影响，优化光催化体系的设计，并实现可控合成与功能化组装。探索TiO2-Ag-Bi2MO6 (M=W, Mo) Z型光催化体系的表/界面形成机理、组成/结构与光催化性能之间的构效关系，并提出Z型复合光催化体系催化活性提高的协同作用机制。本研究为构筑新的高效光催化体系、拓展半导体光催化材料的应用范围提供重要的实验依据，具有重要的理论和实践指导意义。

中文关键词： 二氧化钛-银-铋基复合材料；Z型光催化体系；催化；增效机制

英文摘要： By referring to the characteristics of promoting the separation and transfer process of electron-hole pairs in nature Z scheme photosynthesis, this project proposal is to choose TiO2 and Bi2MO6 (M=W, Mo) semiconductor materials and Ag nanoparticles being as electron mediator to construct mimicking Z-scheme photocatalytic systems, to efficiently isolate the photogenerated electrons and holes and maintain the oxidation and reduction capability of electron-hole pairs, resulting in the enhancement of photocatalytic performance. To achieve structure design, controllable fabrication, and functional assemble of the photocatalytic system, the impact of the morphology and microstructure of TiO2 and Bi2MO6, the size of Ag, and the proportion of each component on the photocatalytic activity of the Z scheme photocatalyst will be discussed. The surface/interface formation mechanism as well as the relationship between the composition/structure and photocatalytic properties of TiO2-Ag-Bi2MO6 (M=W, Mo) Z photocatalytic systems will be investigated. The synergistic mechanisms of the composited photocatalytic system will be summarized. This project proposal is also expected to provide valuable reference, information, and guidance for designing new Z scheme photocatalytic materials and developing semiconductor photocatalysis technology.

英文关键词： TiO2-Ag-Bi-containing composites;Z scheme photocatalytic systems;Catalysis;Synergistic mechanism