Preparation Of Graphene Aerogel Based On Different Reducing Agents

Monolayer graphene is known to be the lightest and the thinnest material,its theoretical specific surface area,thermal conductivity,Young’s modulus,tensile strength and other properties are excellent.It is a kind of carbon material with a very wide potential applications.Graphene aerogel obtained by the sol-gel process is also called graphene sponge,which inherits the advantages such as high specific surface area,high porosity and high conductivity of graphene and aerogels.It also caused great concern and research in the academic circles.The specific research in this thesis can be summarized as follows:Graphene oxide was prepared by improved Hummers method using raw graphite powder.The structure of graphene oxide was studied.SEM,FTIR,Raman,conductivity test and specific surface area analysis and X-Ray diffraction test were used to analyze the graphene oxide obtained.Reduced graphene oxide was prepared by hydrothermal method using graphene oxide and reducing agent.The hydrothermal time,temperature and concentration of graphene oxide was optimized.Ascorbic acid,FeSO4,FeSO4/NH3BH3 were used as reducing agents,respectively.The difference of the reducing agents was studied.SEM,contact angel,specific surface area and Raman was used to analyze and optimize the graphene aerogel,respectively.The adsorption ability was tested using gasoline,chloroform,toluene,methanol and DMF.It was found that the graphene aerogel reduced by ascorbic acid has a great adsorption ability to different organic solvents or oils.Besides,the same adsorption ability of graphene aerogels reduced by FeSO4 or FeSO4/NH3BH3 was not as good as the graphene aerogel reduced by ascorbic acid.UV-vis was used to quantitative characterize the fast adsorption ability to different dyes,including rhodamine B and orange G.The thermodynamic and kinetic model were fitted.The result showed that the thermodynamic model conform to the Langmuir model and the kinetic model conform to the pseudo-second-model.It was calculated that graphene aerogel reduced by FeSO4/NH3BH3 has a great adsorption ability to different dyes.The as received aerogel shows excellent ability of adsorption and will reveal its potential in environmental management.