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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
1 Research Institute of Applied Catalysis, Shanghai Institute of Technology, Shanghai 201418, China 2 Department of Physics, Faculty of Science, Ningbo University, Ningbo 315211, China 3 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China 4 Ningbo Institute of Materials Engineering and Technology, Chinese Academy of Sciences, Ningbo 315201, China These authors contributed equally to this work.
* Authors to whom correspondence should be addressed.
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 (CC BY 3.0).

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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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