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Molecules 2013, 18(11), 14258-14267; doi:10.3390/molecules181114258
Article

Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability

1,†, 2,†, 3,* , 4,*  and 4
Received: 22 October 2013 / Revised: 11 November 2013 / Accepted: 12 November 2013 / Published: 18 November 2013
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Abstract

Fe3O4 spheres with an average size of 273 nm were prepared in the presence of CTAB by a solvothermal method. The spheres were modified by a thin layer of SiO2, and then coated by mesoporous SiO2 (m-SiO2) films, by using TEOS as a precursor and CTAB as a soft template. The resulting m-SiO2/Fe3O4 spheres, with an average particle size of 320 nm, a high surface area (656 m2/g), and ordered nanopores (average pore size 2.5 nm), were loaded with gold nanoparticles (average size 3.3 nm). The presence of m-SiO2 coating could stabilize gold nanoparticles against sintering at 500 °C. The material showed better performance than a conventional Au/SiO2 catalyst in catalytic reduction of p-nitrophenol with NaBH4. It can be separated from the reaction mixture by a magnet and be recycled without obvious loss of catalytic activity. Relevant characterization by XRD, TEM, N2 adsorption-desorption, and magnetic measurements were conducted.
Keywords: solvothermal method; magnetic Fe3O4 spheres; p-nitrophenol; gold catalysis solvothermal method; magnetic Fe3O4 spheres; p-nitrophenol; gold catalysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Liu, H.; Lin, C.; Ma, Z.; Yu, H.; Zhou, S. Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability. Molecules 2013, 18, 14258-14267.

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