Journal
APPLIED SURFACE SCIENCE
Volume 258, Issue 7, Pages 2717-2723Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.10.122
Keywords
Fe3O4@SiO2-Ag magnetic nanoparticles; Silver deposition; p-Nitrophenol; Catalytic activity
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Funding
- National Natural Science Foundation of China [J0730425]
- Main Nature Science Foundation of Gansu Province in China [3ZS041-A25-009]
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In this paper, a novel approach was successfully developed for advanced catalyst Ag-deposited silica-coated Fe3O4 magnetic nanoparticles, which possess a silica coated magnetic core and growth active silver nanoparticles on the outer shell using n-butylamine as the reductant of AgNO3 in ethanol. The as-synthesized nanoparticles have been characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), Fourier transform infrared spectra (FT-IR), vibration sample magnetometer (VSM), and have been exploited as a solid phase catalyst for the reduction of p-nitrophenol in the presence of NaBH4 by UV-vis spectrophotometry. The obtained products exhibited monodisperse and bifunctional with high magnetization and excellent catalytic activity towards p-nitrophenol reduction. As a result, the as-obtained nanoparticles showed high performance in catalytic reduction of p-nitrophenol to p-aminophenol with conversion of 95% within 14 min in the presence of an excess amount of NaBH4, convenient magnetic separability, as well as remained activity after recycled more than 6 times. The Fe3O4 @SiO2-Ag functional nanostructure could hold great promise for various catalytic reactions. (C) 2011 Elsevier B.V. All rights reserved.
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