| Graphene is a monolayer of carbon atoms which was by SP2hybrid closepacked array and with two-dimensional grid structure with six symmetric rules, making itinto a kind of new carbon material ideal. Currently, it’s the world’s thinnest and the onlyexisting free atomic crystal. Graphene as the thinnest materials, it’s only0.34nm, it wasbecame the basic unit of carbon material family system, including zero dimensionalfullerenes, one-dimensional carbon nanotubes and three-dimensional graphite. As the zeroband gap semiconductor, graphene displayed metal features, it also has a larger surfacearea (the theoretical value of2630m2·g-1), the effect of low temperature high electronicmobility, good thermal conductivity, quantum Holzer effect and Klein tunneling. Graphenehas a unique structure and good performance, since it has received extensive attention, itopened a research upsurge in science, especially has received wide attention in the solarcells, sensors, super capacitors, hydrogen storage materials, high-speed transistors, watertreatment, photocatalytic composite materials etc. Although graphene has many advantage,it’s certainly has its defects, when the functional groups of graphene materials in arelatively long time, graphene molecular structure and electrical properties will beseriously affected, more and more serious group influence, therefore, in addition to thestudy of graphene preparation method is more excellent, it’s also need to further reduce theinherent defects of graphene, graphene will combine with other inorganic or organicmaterials to form a composite material which can solve the problem. Due to theintroduction of graphene, the excellent performance of the prepared composite material notonly has graphene, possibly due to the synergistic effect of some new properties. Thispaper is based on the predecessors’ research, on the one hand was the green method toprepare of RGO, aiming at protecting the green environmental. In addition, throughloading, the composite material not only has the characteristics of graphene, but also has anovel loaded performance. The main research contents and results were as follows:1. Study on the green reducing agent to prepare RGO. Graphite oxide wasprepared by Hummers method which using natural flake graphite as raw material, andsodium borohydride, ethylene glycol, ascorbic acid as the green reducing agent, through characterized by X-ray diffraction, FT-IR and scanning electron microscope(SEM). Thebest reaction conditions were as follows: under70℃, NaBH4as a reducing agent andreacted for8h, the best reduction effect was showed.2. Preparation, characterization and the analysis of photocatalytic performanceof Au-TiO2-RGO composite materials. Graphite oxide prepared by Hummers method,which was employing natural flake graphite as raw material, using tetrabutyl titanate astitanium source, and HAuCl4as gold sources,sodium borohydride as the reducing agent,respectively. Au-TiO2-RGO composite material was prepared by one-step hydrothermalmethod and characterized by XRD, FT-IR, SEM, TEM etc., Through changing theconditions of experiment, the various parameters such as the solvents, Au loading, theamount of HCl, the mole ratio of H2O2to styrene, the amount of catalysts and the reactiontime were investigated. During the reaction, hydrogen peroxide (H2O2,30%) played asoxidant, the experiments showed that a small amount of composite material with for ashort time under light can exhibit high activity. |
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