Abstract
Hybrids of graphene oxide (GO) nanosheets and surface-modified Fe 3O 4 nanoparticles (NPs) were fabricated by a two-step process. First, Fe 3O 4 was modified by tetraethyl orthosilicate and (3-aminopropyl) triethoxysilane to introduce amino groups on its surface. Second, the amino groups of Fe 3O 4 were reacted with the carboxylic groups of GO with the aid of 1-ethyl-3-(3-dimethyaminopropyl)carbodiimide and N-hydroxysuccinnimide to form a GO–Fe 3O 4 hybrid. The attachment of Fe 3O 4 NPs on the GO nanosheet surface was confirmed by transmission electron microscopy and Fourier-transform infrared spectroscopy. The adsorption capacity of GO–Fe 3O 4 for methylene blue and neutral red cationic dyes was as high as 190.14 and 140.79 mg/g, respectively. The GO–Fe 3O 4 hybrids could be reduced to form graphene–Fe 3O 4 hybrids by using NaBH 4 as reducing agent and be used to prepare magnetic GO films.
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