Fe/S co-doped g-C3N4 photocatalytic degradation of NO

Abstract

Photocatalytic technology has received extensive attention from researchers because of its low cost，recyclability，and environmental friendliness. However，the photocatalytic performance of pure photocatalytic materials has certain defects，such as high electron-hole pair recombination rate and a small light response range. Therefore，these materials are often modified for practical applications. To improve the degradation performance of graphite phase carbon nitride （g-C3N4） for NO under visible light conditions，Fe/S co-doped modified g-C3N4 product Fe/SCN is prepared by thermal polymerization using melamine，thiourea，and iron nitrate as raw materials. It is found that Fe/S co-doping would destroy the triazine ring structure of g-C3N4，resulting in the disappearance of N—H bond stretching in g-C3N4，and Fe and S elements mainly existed in the form of Fe—N and Fe—S covalent bonds. At the same time，Fe/S co-doping can increase the specific surface area of g-C3N4，improve the separation efficiency of photogenerated carriers，reduce the recombination rate of electron-hole pairs，increase the transient current density，and reduce the electrical impedance，thereby improving the photocatalytic degradation performance. The experimental results of photocatalytic degradation of NO show that the degradation rate of NO by Fe/SCN-4 can reach 40.26% under visible light conditions for 2 h，and the degradation rate is 37.17% after 5 cycles，proving Fe/SCN-4 has good degradation performance and cycle stability.