a Scientific Research Institute Geotechnological Problems of Oil, Gas and

Chemistry, Baku, Azerbaijan

b Institute of Catalysis and Inorganic Chemistry, Baku, Azerbaijan

c Baku Engineering University, Baku, Azerbaijan

d Azerbaijan State Oil and Industry University, Baku, Azerbaijan

e University of Strasbourg, Institute for Chemistry and Processes for Energy, the

Environment and Health, France

Graphene oxide (GO) layers were obtained by oxidation of graphite. Using iron oxide nanoparticles (FeNP) and GO and by GO reduction, a set of reduced nanocomposites FeNP@GO and FeNP@rGO were obtained. Reduction of GO allowed additional functionalization of active centers in rGO. Control of the properties and structure of the formed nanocomposites was carried out by physicochemical methods (X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), chemical analysis). FeNP@GO and FeNP@rGO nanocomposites were used to remove harmful cations from water.