کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5366535 | 1388350 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Ag-deposited silica-coated Fe3O4 magnetic nanoparticles catalyzed reduction of p-nitrophenol Ag-deposited silica-coated Fe3O4 magnetic nanoparticles catalyzed reduction of p-nitrophenol](/preview/png/5366535.png)
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 14Â 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.
⺠We have synthesized Ag-deposited silica-coated Fe3O4 magnetic nanoparticles through a simple electroless-deposition method. ⺠The catalytic activiey of the Ag-deposited silica-coated Fe3O4 magnetic nanoparticles was explored. ⺠We verified that the nanoparticle perform high efficiency in catalytic reduction of p-nirtophenol. ⺠The nanoparticles also can be used as convenient and efficient recyclable catalyst.
Journal: Applied Surface Science - Volume 258, Issue 7, 15 January 2012, Pages 2717-2723