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The attachment of Fe3O4 nanoparticles to graphene oxide by covalent bonding |
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| Authors: | Fuan He Dong Ma Chiwah Leung |
| Affiliation: | a Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China b Key Laboratory for Designed Synthesis and Application of Polymer Materials, School of Chemistry and Chemical Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, China c Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China |
| Abstract: | Hybrids of graphene oxide (GO) nanosheets and surface-modified Fe3O4 nanoparticles (NPs) were fabricated by a two-step process. First, Fe3O4 was modified by tetraethyl orthosilicate and (3-aminopropyl) triethoxysilane to introduce amino groups on its surface. Second, the amino groups of Fe3O4 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-Fe3O4 hybrid. The attachment of Fe3O4 NPs on the GO nanosheet surface was confirmed by transmission electron microscopy and Fourier-transform infrared spectroscopy. The adsorption capacity of GO-Fe3O4 for methylene blue and neutral red cationic dyes was as high as 190.14 and 140.79 mg/g, respectively. The GO-Fe3O4 hybrids could be reduced to form graphene-Fe3O4 hybrids by using NaBH4 as reducing agent and be used to prepare magnetic GO films. |
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