Preparation Of Graphene Nanocomposites And Catalytic Performance Study

Water pollution and air pollution have become the first threat to human health.Therefore,the development of a new material that can be used for environmental pollution treatment and prevention has become a hot spot in current research.The higher theoretical specific surface area,special large?bond structure and other characteristics of graphene render it unique optical,electrical and mechanical properties,and have important application prospects in the field of environmental pollutant treatment and prevention.Based on graphene oxide which is rich in oxygen-containing functional groups,a series of composite structures supporting metal and metal oxide nanoparticles were constructed to realize the catalytic conversion of p-nitrophenol in water pollutants and the removal of sulfides in gasoline.In this study,through the fine chemical regulation,the preparation of special nanostructures of graphene-loaded hollow copper spheres can be realized.The composite material can effectively convert the water pollutant p-nitrophenol into a product p-aminophenol,and then recycle and use it as a fine organic chemical intermediate.Compared with the traditional copper-based catalyst,the graphene-supported hollow copper sphere has the advantages of large surface area,many active sites,and rich pore structure.More importantly,graphene can achieve close adsorption with p-nitrophenol through?-?bond,and promote the further improvement of catalytic performance through synergy with electron transfer between hollow copper spheres.The kinetic constant of the catalytic nanostructure catalyzed conversion of p-nitrophenol is as high as 130,000 min^-1 g^-1,and the complete conversion of contaminants can be realized within 210 s.Sulfide in gasoline will increase the emission of pollutants in the exhaust gas.Therefore,reducing the sulfur content in catalytic cracking gasoline has become the key to prevention and control of atmospheric pollution.In response to this problem,this study developed a variety of graphene-loaded metal and metal oxide nanoparticles composite materials,the graphene in the composite structure can form a van der Waals heterostructure with the thiophene sulfide in the catalytic cracking gasoline,and the metal and metal oxide nanoparticles can specifically anchor the sulfur atom to achieve the removal of the thiophene sulfide.On this basis,this study further prepared a three-dimensional porous structure of graphene-supported zinc oxide,which successfully inhibited the desorption of sulfides and greatly improved the desulfurization effect.The sulfur capacity of the thioether model compound having an original sulfur content of 290 ppm was 29.67 mg S/g adsorbent.