عنوان مقاله [English]
In this present study, preparation of graphene oxide is improved. Graphene oxide was obtained with high purity and high interlayer distance in low time via changes in Staudenmaier method. Then, graphene oxide was functionalized with Fe3O4 nano particles. Characterization was carried out by FT-IR and XRD techniques. Then, adsorption of Pb2+ and Pd2+ ions from aqueous solution was investigated using functionalized and no functionalized graphene oxide. Several important parameters in the adsorption were studied such as sorbent mass, contact time, pH, temperature and metallic pollutants amount. The maximum adsorption value of Pb2+ ion were 86.5 and 93% using graphene oxide and magnetic graphene oxide, respectively. While, maximum adsorption value of Pd2+ ion were 63 and 78% using these adsorbents. The experimental results showed that lead and palladium ions adsorption much better fit with the Freundlich and Temkin isotherms. The best model for the adsorption kinetic was shown with the Logergren and Elovich kinetic models. It can be concluded that the magnetic graphene oxide has high adsorption, which can be used as an effective adsorbent for Pb2+ and Pd2+ ions.