Fe-S共掺杂g-C3N4/TiO2异质结的构建及光催化性能OA

In order to enhance the photocatalytic efficiency of TiO2 under visible light conditions,iron-sulfur co-doped graphitic phase carbon nitride Fe/SCN was prepared from thiourea and iron nitrate Fe(NO3)3·9H2O by roasting,and the heterojunction composite photocatalysts,Ti-Fe/SCN,were further constructed by roasting with Fe/SCN and TiO2.The photocatalytic performance was investigated by using XRD,SEM,XPS,UV-Vis DRS,PL,BET and EIS to characterize the prepared photocatalysts,and the photocatalytic performance was evaluated by the photocatalytic degradation rate of NO under visible light conditions,and the mechanism of its photocatalytic degradation of NO was explored by free radical trapping experiments.The results show that the degradation performance of Ti-Fe/SCN is better than that of TiO2,and Ti-Fe/SCN-4 shows the best degradation performance.Under visible light,the degradation rate is 30.93%,which is attributed to the existence of a Z-type heterojunction between Fe/SCN and TiO2,effectively reducing the photogenerated carrier complexes and improving the photocatalytic activity of the composites.The degradation rate of the composites decrease by only 3.6%after five cycles.From the radical trapping experiments,the·OH and·O2-play a major role in the reaction system.