磁性氧化石墨烯的制备及对铜离子吸附性能的研究

Study on Preparation and Cu^(2+) Ions Adsorption Characterization of Magnetic Graphene Oxide

以Hummers法制备二维氧化石墨烯,并通过原位合成Fe_3O_4赋予氧化石墨烯以磁性,得到具有良好铜离子吸附效率和高磁性的磁性氧化石墨烯材料.以NH_3·H_2O-NH_4Cl缓冲溶液替代碱液,克服了传统制备方法中由于体系pH值持续降低导致产品性能下降的缺陷.透射电镜测试结果表明,该材料具有良好的二维片层结构.磁学及吸附测试结果表明,该材料具有强磁性和优异的Cu^(2+)吸附性能.吸附动力学表明符合准二级吸附动力学模型,属于基于化学吸附机理控制速率的吸附方式.

We synthesized 2D graphene oxide with Hummers’ method,endowed the graphene oxide with magnetism by Fe3O4 that was prepared by in situ synthesis,and finally obtained magnetic graphene oxide with high magnetism and good adsorption efficiency for cupric ion. In the synthesis,alkaline liquor was replaced with NH3·H2O NH4Cl buffer solution. This overcame the drawback from traditional ways in which the property of products is compromised due to the continuous decrease in the pH value of systems. The result of TEM showed that the magnetic graphene oxide possessed excellent 2D layered structure. The results of magnetic property and adsorption experiment showed that the magnetic graphene oxide had strong magnetism and outstanding adsorption efficiency for cupric ion. The result of adsorption kinetics suggested that the adsorption is a process of pseudo second kinetics and has an adsorption way where chemical adsorption mechanism controls the speed.