Preparation And Properties Of G-C₃N₄/BiOX?X= Cl,Br? Photocatalyst

In recent years,the use of graphene carbon nitride for environmental protection and the development of solar fuels has caused widespread concern around the world.Although g-C3N4 has thermal stability and chemical stability,but with low utilization of visible light,photogenerated electron-hole pair recombination and other issues.In order to solve these problems,we prepared an efficient visible light-responsive photocatalyst by modifying g-C3N4 and recombining with BiOX(X = Cl,Br)photocatalyst on the modified g-C3N4 substrate.The main contents are as follows:(1)Bulk g-C3N4 was prepared by thermal polymerization,and thermal oxidation g-C3N4 and liquid-phase separation g-C3N4 were respectively prepared by thermal oxidation method and ultrasonic stripping method.The TEM picture shows that the thermal oxidation modification breaks the massive g-C3N4 into small fragments of about 50 nm,and the liquid-phase delamination modification peeled off g-C3N4 to reduce the thickness of g-C3N4,However,the basic structural units of massive g-C3N4 were not destroyed by XRD and FTIR analysis.Photocatalytic degradation results show that the modified g-C3N4 photocatalyst has been improved.(2)BiOCl and modified thermal oxidized g-C3N4 were compounded by a simple solvothermal method,and the thermally oxidized g-C3N4/BiOCl composite photocatalyst was obtained.XRD,XPS and FTIR methods were used to learn the elemental composition and structure of the composites.The results of PL and DRS spectra showed that the photoelectric properties of the composites were effectively improved.The degradation of Rhodamine B and phenol photocatalytic performance of the composite catalyst to further understand,and the composite structure improved the BiOCl response to visible light.The study on the reaction mechanism shows that the hole plays a major role in the thermal degradation of g-C3N4/BiOCl composites.(3)Liquid-phase exfoliated g-C3N4/BiOBr composites were prepared by a simple solvothermal method using modified g-C3N4 as a carrier.XRD,FTIR,XPS and other results obtained composite structure and elemental composition of the same theory.TEM image shows the liquid stripping g-C3N4 and BiOBr existed in a layered structure.The two materials after the composite were tightly stacked together.Photocatalytic degradation experiments show that compared to a single material composite photocatalytic properties even more excellent.