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Citric acid‐Functionalized graphene oxide was well‐dispersed in water and could highly stabilize Fe3o4 nanoparticles the nonocompsite showed high capacity in the removal of methylene blue.

Nanohybrid of graphene oxide (GO) and azidemodified Fe 3 O 4 nanoparticles (NPs) were fabricated using click reaction. First, Fe 3 O 4 NPs were modified by 3-azidopropionic acid. Then, click-coupling of azide-modified Fe 3 O 4 NPs with alkyne-functionalized GO was carried out in the presence of CuSO 4 Á5H 2 O and sodium L-ascorbate at room temperature. The attachment of Fe 3 O 4 NPs onto the graphene nanosheets was confirmed by Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscopy, thermogravimetric analysis, energy dispersive X-ray spectrometry and X-ray diffraction spectrometry. As the FTIR 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 Fe 3 O 4 -clicked GO was 44.3 emu g -1 . The synthesized hybrid was used in the adsorption of methylene blue and congo red (CR). The adsorption capacities in the studied concentration range were 109.5 and 98.8 mg g -1 for methylene blue and CR, respectively.