Preparation And Photocatalytic Properties Of Graphite Phase Carbon Nitride Doped With Zinc Oxide And Graphene

The g-C₃N₄ is a new type of visible light corresponding material,which has attracted more and more researchers'attention.Although g-C₃N₄ has the characteristics of visible light response,but the response range of visible light is relatively narrow,and there are still some problems such as smaller surface area and so on,which seriously restrict the photocatalytic performance of graphite phase carbon nitride.In view of the defects in graphite phase carbon nitride,a certain process has been done to obtain graphite phase carbon nitride.Compared with conventional graphite phase carbon nitride,the specific surface area of graphite carbon nitride has been greatly improved,which is very important for improving the photocatalytic performance of graphite phase carbon nitride.In view of the photocatalytic defects existing in graphite phase carbon nitride,composite doping treatment was carried out.Different contents of ZnO-g-C₃N₄ two element composites and ZnO-g-C₃N₄/rGO three component composites with different contents were prepared.The samples were analyzed and characterized by XRD,TEM,SEM,IR and UV.Meanwhile,methylene blue and methyl orange were used as photocatalytic degradation materials to determine the photocatalytic effect and catalytic stability of different content samples.The research contents of this paper include the following aspect:?1?Using melamine as the raw material,graphite phase carbon nitride was prepared by thermal condensation.The experimental temperature was controlled and the best experimental temperature was found.Combined with the photocatalytic properties and sample morphology of graphite phase carbon nitride,the results show that the graphite phase carbon nitride prepared by thermal condensation polymerization at 550 temperature has the best photocatalytic performance.?2?The graphite phase carbon nitride sample was prepared by the method of calcining and strong acid and strong alkali peeling off to peel the prepared graphite phase carbon nitride.The results show that the surface area of graphite phase carbon nitride prepared by repeated calcination oxidation is the largest and its photocatalytic performance is the best.?3?The ZnO-g-C₃N₄ two element composites with different content were prepared by two element doping of single layer graphite phase carbon nitride.The morphology,structure and photocatalytic properties of ZnO-g-C₃N₄ two component composites with different contents were analyzed,and the best mass ratio,ZnO-50%g-C₃N₄,was found.The sample of ZnO-50%g-C₃N₄ can not only broaden the light response range of graphite phase carbon nitride,but also can effectively improve the photocatalytic effect of the sample.?4?The ZnO-50%g-C₃N₄ samples were doped with rGO,and the structure,morphology and photocatalytic effect of ZnO-50%g-C₃N₄/rGO samples with different content were investigated.It is found that the photocatalytic effect of the three element compound of ZnO-50%g-C₃N₄/10%rGO is the best,and the photocatalytic stability of the substance is good.