Preparation Of New Type Graphene Nanocomposites And Their Catalytic Performance For Organic Wastewater Treatment

TiO2 is a good material, which can degrade many pollutants. TiO2 is stable and nontoxic as well as cheap. This paper presents Ag/Fe3O4/TiO2/RGO. Herein, graphene has large specific surface area, excellent mechanical strength, high electron mobility and good permeability, with effective photon absorbance. Ag nanoparticles can be used as a catalyst, can accelerate the reaction activity and improve the photocatalytic efficiency. In addition, the metal nanoparticles with surface plasman resonance effect, greatly enhance light absorption performance and carrier excitation efficiency. Fe3O4 possesses the characteristics of strong magnetic and easy preparation and magnetic particles space interval effect can prevent graphene layers between the aggregation or accumulation, Fe3O4 nanoparticles with low toxicity, low cost and environmental friendly, etc. The main conclutions are listed as follow:1. Graphene oxide was prepared through the improved Hummers method, and characterized by XRD, SEM, TEM. The results showed that the method was a better quality of successful preparation of the graphene oxide, and discussed the change of reaction conditions, the amount of graphite is 0.50g, the amount of KMnO4 and graphite is 10:1, H2SO4 is 25 mL.2. Using GO and butyl titanate as raw materials, Ethanol as reductant, TiO2/RGO, Fe3O4/TiO2/RGO and Ag/Fe3O4/TiO2/RGO nanocomposites were prepared successfully. Characterized by XRD, SEM and TEM. The results showed that the success of the experiment of preparation of a pure anatase phase TiO2 nanoparticles, at the same time, TiO2 successfully in situ growth on the surface of graphene. After an hour of ultraviolet light.3. Methyl orange was used to simulate organic wastewater. With methyl orange as goal pollutant investigation materials photocatalyticperformance. After an hour of ultraviolet light, TiO2 photocatalytic degradation rate was 34.0%, TiO2/RGO degradation rate was 78.4%, Fe3O4/TiO2/RGO degradation rate was 81.2%, Ag/Fe3O4/TiO2/RGO photocatalytic degradation rate was 96.6%, which shows excellent catalytic performance. And the nanocomposite material, after repeated used 6 times, the photocatalytic efficiency is 85.5%.Ag/Fe3O4/TiO2/RGO nanocomposite were prepared successfully, the material not only has high catalytic efficiency also has recycled function, can be applied to real life, becomes environmentally friendly photocatalytic materials.