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Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability
Research Institute of Applied Catalysis, Shanghai Institute of Technology, Shanghai 201418, China
Department of Physics, Faculty of Science, Ningbo University, Ningbo 315211, China
Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
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; in revised form: 11 November 2013 / Accepted: 12 November 2013 / Published: 18 November 2013
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
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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.
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(11):14258-14267.
Liu, Huan; Lin, Chao; Ma, Zhen; Yu, Hongbo; Zhou, Shenghu. 2013. "Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability." Molecules 18, no. 11: 14258-14267.