Visible Light Photocatalytic Degradation Of Rhodamine B By G-C₃N₄ Composites

With the continuous improvement of people’s quality of life,the water problem has been paid more and more attention by all walks of life.Among them,various indicators of drinking water are particularly concerned.If people accidentally drink contaminated water sources,they are very likely to cause great harm to the body.Among these pollution sources,it is difficult to deal with:heavy metal pollution and some organic dye pollution,etc.Rhodamine B is a relatively common organic dye.Once it enters the wate,it is easily dissolved,causing water pollution.If it enters the body,it will cause serious harm to the skin tissues and kidneys of the human body.Even a small amount of contact for a long time will also have the risk of causing cancer.In addition,Rhodamine B will quickly change the color of the water when entering the water,and the viewing effect of many landscape water will be greatly affected.Therefore,it is necessary for us to develop an efficient and green material to deal with such harmful substances.C₃N₄ material is a type of material that has been used more in the photocatalysis field in recent years because of its advantages such as stability,low cost,and high relative activity.However,it also has the problem of low visible light absorption and conversion efficiency.Therefore,this article aims to improve the photocatalytic activity of C₃N₄through different synthesis methods,loading different proportions metal compounds,and successfully synthesized g-C₃N₄/LaNiO₃,g-C₃N₄/Co（OH）₂,NiS/g-C₃N₄ and other binary composite materials.In this paper,research on the photocatalytic degradation of rhodamine B solution was carried out to test the photocatalytic ability of synthetic materials.In the synthesis process,different proportions of supports（LaNiO₃,Co（OH）₂,NiS）were added,and different binary composite materials were synthesized through various methods such as calcination,hydrothermal,and solvothermal methods.The synthesized materials were analyzed by SEM,TEM,XRD,UV-vis and XPS and other different characterization methods,which proved that g-C₃N₄/LaNiO₃,g-C₃N₄/Co（OH）₂,NiS/g-C₃N₄ composite materials Successfully prepared.It was applied to the experiment of photocatalytic degradation of rhodamine B.It was determined that 0.5g-C₃N₄/LaNiO₃,0.75g-C₃N₄/Co（OH）₂,1.0wt%NiS/g-C₃N₄ compared to pure g-C3N4 materials have The most obvious photocatalytic effect is improved.Through the experimental data and analysis of the reaction kinetics curve,it is clear that the multiples of the reaction rate of the composite material are accelerated.Among them,1.0wt%NiS/g-C₃N₄ has the best photocatalytic degradation effect of rhodamine B.The removal rate of rhodamine B can reach 97.2%at 150 min,and the reaction rate is increased by 2.9 times.At the same time,the reasons for the improvement of the photocatalytic performance of the composite material are analyzed,mainly due to the formation of a heterostructure in the composite material,which shows excellent performance in the photocatalytic treatment of rhodamine B.The above-mentioned materials have certain application value in water treatment.