石墨相氮化碳光催化剂研究进展

Research progress of the photocatalyst carbon nitride with graphite phase

通过对石墨相氮化碳(g-C_3N_4)光催化剂修饰改性,以便控制光生电子-空穴对的复合,从而使得其光催化活性得到改善。非金属掺杂g-C_3N_4光催化剂能够拓展其光谱响应范围,从而提高了g-C_3N_4的量子效率;贵金属沉积修饰g-C_3N_4光催化剂,能够优化g-C_3N_4光催化剂表面电子结构、促进光生电子与空穴对的快速分离,改善催化剂表面化学吸附状态;通过半导体偶合,使得催化系统的载流子的分离效率得到改善,进而拓展了催化材料对光谱的吸收范围,提高了复合催化剂的光活性。阐述了近年来国内外非金属掺杂、贵金属沉积、半导体复合g-C_3N_4光催化剂在污水处理、光催化分解水产氢等领域中应用的研究进展,并提出在g-C_3N_4光催化剂修饰改性研究中存在的关键问题和以后努力的方向。

Activity of photocatalytic reaction of carbon nitride of graphite phase（g-C3N4）was improved by modifying g-C3N4 which influenced the recombination of photoproducting electrons and holes on the surface of g-C3N4.The scope of the spectral response of g-C3N4 was broadened by nonmetallic elements doped g-C3N4,which increased photocatalytic quantum efficiency of g-C3N4.The surface electronic structure of g-C3N4 was optimized,the rapid separation of photoproduction electrons and holes was promoted,and thechemical adsorption state of catalytic surface was improved by precious metal depositedg-C3N4.The charge separation efficiency of composite catalyst system can be improved,the absorption range of g-C3N4 for light can be extended,and the photocatalytic activity of composite catalyst can be improved by g-C3N4 combined with the other photocatalytic material.In recent years,the latest research progress of applications of nonmetallic elements doped g-C3N4,precious metal depositedg-C3N4 and semiconductor couling g-C3N4 in the field of wastewater treatment and photocatalytic decomposition of water producing hydrogenat home and abroad were reviewed.Finally,the main problems and the future striving direction in the study of g-C3N4 modification were presented.