▎ 摘　　要

In the present study, nanoporous graphene was magnetized with Fe3O4 nanoparticles (NPG/Fe3O4) to promote its capabilities for the faster removal of hexavalent chromium (Cr(VI)) from aqueous solution. In order to minimize the adverse effects of magnetized nanoparticles, they can be easily separated by an external magnetic field. The size, crystallinity, and morphological structures of the adsorbent were characterized by SEM, TEM, XRD, and FT-IR techniques. The effect of various experimental parameters such as pH of solution, contact time, adsorbent dosage, temperature, and initial Cr(VI) concentrations on the adsorption efficiency was investigated in a batch procedure. The experimental equilibrium data were fitted to the Freundlich isotherm and pseudo-second-order kinetic models. According to thermodynamic studies, the adsorption process was spontaneous and endothermic in nature. Finally, our results suggested that NPG/Fe3O4 has a good potential in the Cr(VI) removal and can be effectively utilized in industrial wastewater treatment processes.