Ag-deposited silica-coated Fe3O4 magnetic nanoparticles catalyzed reduction of p-nitrophenol

By Xiaoyang Du, Jiang He, Jie Zhu, Lijuan Sun, Songsong An. 2012

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Abstract In this paper, a novel approach was successfully developed for advanced catalyst Ag-deposited silica-coated Fe 3 O 4 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 AgNO 3 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 NaBH 4 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 NaBH 4 , convenient magnetic separability, as well as remained activity after recycled more than 6 times. The Fe 3 O 4 @SiO 2 –Ag functional nanostructure could hold great promise for various catalytic reactions.

Subfields: Catalysis, Materials Chemistry, Organic Chemistry

View Paper: https://www.semanticscholar.org/paper/e07b2e1002496283ae6607a313975dc882d20c8b