不同还原剂制备石墨烯气凝胶的研究
毕业论文关键词：石墨烯气凝胶；吸附；氧化石墨
Abstract 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. In this paper, the graphite powder was oxidized by Hummers method to prepare graphene oxide, and through hydrothermal method synthesizes graphene hydrogel with different reducing agent. Then get the aerogel after freeze drying.Observe the appearance and morphology of the graphene hydrogel and aerogel prepared under different conditions,and the influence factors of concentration and temperature were analyzed. We can found that when the graphene oxide concentration was 2 mg / mL, hydrothermal temperature is 95 ℃, the prepared graphene hydrogel structure more stable and compact, strength is better, and the structure is not obvious defects, and making the aerogel porous structure and is not easy to collapse, surface defects less.Then,the samples were tested and characterized by scanning electron microscope (SEM), and laser Raman spectrometer .Found in ammonia borane and ferrous ions as reducing agent to prepare aerogel pore structure is uniform and rich, and effectively increases the specific surface area and the structure is better than that of in ascorbic acid(LAA), ferrous ion as reducing agent to prepare aerogel.Adsorb rhodamine B in graphene aerogel,test its adsorption properties.Find to ammonia borane(NH3BH3) and ferrous ions as reducing agent to prepare graphene aerogel of Rhodamine B is the maximum adsorption capacity and adsorption rate of the fastest. Thus it can be seen that in the adsorption of Rhodamine B using ammonia borane and ferrous ions for reduction of graphene aerogel adsorption has the best performance. Key words: graphene aerogel; adsorption; graphene oxide
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