过氧化制备磁性氧化石墨烯及对铀的吸附研究

Preparation of Magnetic Peroxide Oxidation Graphene Research on Adsorption of Uranium

利用过氧化法制备出氧化石墨烯,在氮气的保护下合成磁性氧化石墨烯(MGO)。考察了溶液pH、铀的初始浓度、吸附时间和吸附温度对铀吸附影响。用电镜扫描和XRD对MGO进行了形貌结构表征,确定了Fe_3O_4成功的负载在氧化石墨烯上。结果表明,吸附等温线符合Langmuir模型,吸附动力学符合准二级动力学,热力学表明吸附为自发吸热过程。最大吸附为224.93 mg/g。

The performance of a composite material magnetic oxide graphene （MGO）, which use peroxide method preparation of graphene oxide and under the protection of nitrogen. The influences of adsorption dosage, pH of solution, initial UO22＋ concentration, adsorption time and the contact temperature on adsorption amounts have been discussed. Morphology characterized by electron microscope scanning and XRD determine Fe3O4 successful load on the graphene oxide. The results have shown that the Langmuir isotherm model fits the experimental date, and the pseudo-second order equations were selected tosimulate the adsorption process. Thermodynamic results show that the adsorption of endothermic spontaneous process. It was found that the maximum adsorption capacity uf224.93 mg·g-1.