Hybrids of graphene oxide (GO) nanosheets and surface-modified Fe3O4nanoparticles (NPs) were fabricated by a two-step process. First, Fe3O4was modified by tetraethyl orthosilicate and (3-aminopropyl) triethoxysilane to introduce amino groups on its surface. Second, the amino groups of Fe3O4were reacted with the carboxylic groups of GO with the aid of 1-ethyl-3-(3- dimethyaminopropyl)carbodiimide and N-hydroxysuccinnimide to form a GO-Fe3O4hybrid. The attachment of Fe3O4NPs on the GO nanosheet surface was confirmed by transmission electron microscopy and Fourier-transform infrared spectroscopy. The adsorption capacity of GO-Fe3O4for methylene blue and neutral red cationic dyes was as high as 190.14 and 140.79 mg/g, respectively. The GO-Fe3O4hybrids could be reduced to form graphene-Fe3O4hybrids by using NaBH4as reducing agent and be used to prepare magnetic GO films.
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