可见-近红外光响应的石墨相氮化碳/石墨烯量子点复合材料的可控制备及其光催化性能研究

项目名称： 可见-近红外光响应的石墨相氮化碳/石墨烯量子点复合材料的可控制备及其光催化性能研究

项目编号： No.51302274

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 梁庆华

作者单位： 中国科学院理化技术研究所

项目金额： 25万元

中文摘要： 设计和开发高效光催化材料对缓解能源危机及环境污染具有重大意义，该领域的工作一直以获得宽光谱响应、环境友好型光催化材料作为研究焦点。不含金属的石墨相氮化碳半导体因其环境友好性在光催化领域备受青睐，但其缺点在于太阳能利用效率不高、光生电子和空穴复合速率快。根据文献调研和相关工作基础，本项目拟利用石墨烯量子点对石墨相氮化碳进行改性，从而使石墨烯量子点的上转换发光、高载流子迁移率、宽光谱响应、稳定性好等优点与g-C3N4材料的光催化优势相结合，获得不含金属、具有可见-近红外宽光谱响应、催化活性高、稳定性好的石墨相氮化碳/石墨烯量子点新型光催化材料。考察该复合材料在光解水制取氢气和降解有机污染物方面的光催化活性，通过探索反应机理，期待为开发不含金属且具有可见-近红外宽光谱响应的环境友好型高效光催化剂提供设计思路，也力争为该系列催化剂产品的实用化提供技术支持。

中文关键词： 光催化；石墨相氮化碳；可见光；多孔结构；二维材料

英文摘要： Since it is of great significance to design and obtain novel efficient photocatalytic materials to alleviate the global energy crisis and environmental pollution, plentiful of studies have been focusing on acquiring the environmentally friendly and efficient photocatalysts that can take full advantage of solar energy. Recently, owing to several advantageous properties including the high stability, environmental benign and low-cost, the metal-free semiconductor of graphite phase carbon nitrite has attracted great attention in the fields of photocatalysis. However, two disadvantages involved with the inefficient utilization of solar energy and the fast recombination of photo-generated electrons and holes greatly reduce their photocatalytic activity. Based on previous studies and our early works, this project aims to develop the novel metal-free graphite phase carbon nitrite (g-C3N4) /graphene quantum dots (GQDs) photocatalytic composites that can combine the outstanding features of GQDs, such as up-converted emission, high rate of carrier mobility, good stability and broad spectral response, and the photocatalytic advantages of g-C3N4. More important, we will investigate the photocatalytic mechanism and their applications in splitting water and degrading organic pollutions with the assistance of simulated solar li

英文关键词： photocatalysis；graphitic carbon nitride；visible light；porous structure；two-dimensional materials