Study On Graphite Carbon Nitride/reduced Graphene Oxide-based Composite Materials: Synthesis,characterization And Properties

Graphene and graphitic-likecarbon nitride with layed structure have the excellent physical and chemical properties.In this experiment,they were used as a substrate to fabricate composites with the iron oxide and titanium dioxide.Then the intermediate product was subjected to hydrothermal treatment.We investigated their photocatalytic degradation and supercapacitor electrode materials performance.In order to enhance the electrochemical performance of graphene/Fe3O4 composite,g-C₃N₄ was incorporated into the composite to increase the number of electrochemical active centers via a simple assembly process.Positively charged protoned g-C₃N₄ nanosheets were adopted to combine with negatively charged graphene oxide nanosheets?GO?in the presence of positive charged Fe?OH?₃ colloid nanoparticles?NPs?.Due to the strong interaction between the opposite charged components,Fe?OH?₃/g-C₃N₄/GO composite was obtained.After the conversion of GO to reduced graphene oxide?rGO?and Fe?OH?₃ to Fe3O4 in a hydrothermal treatment process in autoclave at 120 ? for 4 h,Fe3O4/g-C₃N₄/r GO composite?FCGC?was obtained and used for further experiment.TEM,FT-IR,XRD,Raman,and XPS techniques were used to investigate the morphology and structure details of the FCGC sample.When used as electrode material for supercapacitors?SCs?,the high specific capacitance of 302.4 F/g was obtained at the current density of 0.5 A g-1in 6 mol/L KOH solution.After 3000 cycles,the capacitance was maintained about89.7%,showing the excellent stability.Positively charged protoned g-C₃N₄ nanosheets were adopted to combine with negatively charged graphene oxide nanosheets?GO?in the presence of positive charged TiO₂ colloid nanoparticles?NPs?,because of the strong electrostatic interaction.Different experiment condition was carried out on the intermediate product and g-C₃N₄/TiO₂/rGO compound?CTGC?were prepared.FE-SEM,FT-IR,XRD,Raman,XPS and UV-vis techniques were used to investigate the morphology and structure details of the CTGC sample.Efficiency of the prepared samples was investigated by monitoring the degradation of Rhodamine B?RhB?under visible lightirradiation.Compared with g-C₃N₄,TiO₂ and rGO,the composites possessed much higher adsorption capacities and visible light photocatalytic activity in the degradation of RhB.With an initial concentration of 20 mg/L of RhB,the degradation rate of RhB reached up to 98.7% under visible light irradiation over 5.0 mg of the resulting composites.Improved photocatalytic activity in g-C₃N₄/TiO₂/rGO is observed owing to higher specific surface area and enhanced visible light absorption capability.Most importantly,the electrostatic self-assembly process might enhance the interaction among g-C₃N₄,TiO₂ and rGO,which facilitates a fast electron transfer at the interface of compounds.This synergistic approach could prove useful for the design and development of other visible light active photocatalysts with high chemical stability.