Synthesis Of Graphite-like Carbon Nitride-based Photocatalyst And Study On The Performance Of Photocatalytic Decomposition Water To Produce Hydrogen

Graphite-like carbon nitride?g-C₃N₄?,as a visible light-responsive organic semiconductor material,has attracted the attention of researchers due to its unique two-dimensional structure,excelent thermal stability and good acid and alkali resistance.However,the disadvantages of g-C₃N₄ photogenerated carriers are easy to recombine,small specific surface area,low visible light absorption rate,etc.,which limits its deep application in the field of photocatalysis.Therefore,in order to efficiently apply g-C₃N₄,it must be modified by various means to improve its photocatalytic activity.The main research content of this article is mainly carried out with g-C₃N₄,and it is modified by two methods of regulating structure and compounding with the co-catalyst to achieve the purpose of improving its photocatalytic performance.The main research contents of this paper are as follows:?1?The porous g-C₃N₄/WO₃ photocatalyst was successfully prepared by the method of mixing hydrated tungsten oxide with urea and calcining.And using SEM,TEM,XRD,XPS,BET and other characterization methods to study the morphology structure,photoelectric properties and photocatalytic properties of composite materials.The purpose of calcination after introducing hydrated tungsten oxide into urea is to leave irregular nanopores inside the generated carbon nitride,thereby increasing the specific surface area of the photocatalyst,increasing the reactive sites,the formation of heterojunctions improves the separation and transfer rate of photo-generated carriers.The two synergistically enhance the photocatalytic activity.The hydrogen production effect shows that the best performance sample GCN-W10 has a hydrogen production efficiency of 963?mol g^-1h^-1.is the three times than original carbon nitride.?2?First,simple calcination method was used to synthesize g-C₃N₄,and then quantitative g-C₃N₄,was reacted with appropriate amount of NiCl₂·6H₂O to obtain Ni?OH?₂/g-C₃N₄ photocatalyst.The method of SEM,XRD,XPS and other means was used to characterize its morphology structure and photocatalytic performance.The purpose of introducing rod-shaped Ni?OH?₂ is to replace precious metals such as Au,Ag,Pt as cocatalysts,which is beneficial to reduce the cost of catalyst.Among them,the optimal hydrogen production efficiency of the CN-Ni2 sample is 21?mol g^-1h^-1,which is about 105times that of the original g-C₃N₄,due to the formation of rod-shaped Ni?OH?₂ and g-C₃N₄ heterostructures,the separation and transfer efficiency of photo-generated carriers is improved,thereby improving the efficiency of photocatalytic hydrogen production.Figure[31]Table[2]Reference[115]...