Nanohybrid of graphene oxide and azide-modified Fe3O4 nanoparticles were fabricated using click reaction. First, Fe3O4 nanoparticles were modified by 3-azidopropionic acid. Then, click-coupling of azide-modified Fe3O4 nanoparticles with alkyne-functionalized graphene oxide was carried out in the presence of CuSO4.5H2O and sodium L-ascorbate at room temperature. The attachment of Fe3O4 NPs onto the graphene nanosheets was confirmed by Fourier-transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, energy dispersive X-ray spectrometry and X-ray diffraction spectrometry. As the Fourier-transform infrared spectroscopy and energy dispersive X-ray spectrometry analysis showed, the final magnetic graphene nanosheets were also reduced by sodium ascorbate which is a merit for click-coupling reactions. The specific saturation magnetization of the Fe3O4-clicked graphene oxide was 44.3 emu g-1. The synthesized hybrid was used in the adsorption of methylene blue and congo red. The adsorption capacities in the studied concentration range were 109.5 and 98.8 mg g-1 for methylene blue and congo red, respectively.