热聚合制备氮掺杂氮化碳光催化性能研究

Study on Photocatalytic Performance of Nitrogen-doped Carbon Nitride Prepared by Thermal Polymerization

石墨相氮化碳(g-C_(3)N_(4))作为一种多功能光催化剂,由于其具有可调节的电子能带结构和伴随2.7 eV合适带隙能量的有效光收集等优点,已逐步应用于降解水体污染物特别是有机染料。但由于体相g-C_(3)N_(4)比表面积小,光生电子-空穴对复合速率快,光催化效率受到限制。因此,可以对g-C_(3)N_(4)进行元素掺杂以提高其光催化降解性能。在此主要介绍了氮有效掺杂g-C_(3)N_(4),减小带隙的同时抑制电子-空穴对的快速复合,从而极大地提高了催化性能。

As a multi-functional photocatalyst,graphite phase carbon nitride(g-C_(3)N_(4))has been gradually applied to the degradation of water pollutants,especially organic dyes,which is the result of its adjustable electronic band structure and effective light collection with suitable band gap energy of 2.7 eV.However,due to the small specific surface area of bulk g-C_(3)N_(4)and the fast recombination rate of photogenerated electron-hole pairs,its photocatalytic efficiency is limited.Therefore,element doping can be carried out to improve the photocatalytic degradation performance of g-C_(3)N_(4).It was mainly introduced that nitrogen effective doping g-C_(3)N_(4)could reduce the band gap and restrain the rapid recombination of electron-hole pairs,thus greatly improving its catalytic performance.