▎ 摘　　要

In the present work, graphene oxide (GO) was prepared by hummers method from natural graphite and modified with iron oxide nanoparticles. The structural order and textural properties of the graphene-based materials were studied by TEM, XRD, TG-DTA and FT-IR. Hydrogen adsorption measurements have been carried out at 77 or 87 K, and atmospheric pressure on graphene oxide and Fe3O4-graphene oxide materials. Hydrogen adsorption at 77 K and atmospheric pressure reached values in the order of 1.7 and 2.1 wt% for graphene oxide and Fe3O4-graphene oxide materials, respectively. The hydrogen adsorption capacities of the Fe3O4-graphene oxide materials compare favorably well with those attained with high-value carbon materials. The isosteric heat of adsorption (Q (st)) was investigated as a function of hydrogen uptake at 77 and 87 K over the pressure range of 0 to atmospheric pressure. The isosteric heat of adsorption for magnetic GO (9.7 kJ mol(-1)) was found to be higher than for GO (6.1 kJ mol(-1)).