Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability
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 sphe...
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| Format: | Article |
| Language: | English |
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MDPI AG
2013-11-01
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| Series: | Molecules |
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| Online Access: | http://www.mdpi.com/1420-3049/18/11/14258 |
| _version_ | 1818487908075569152 |
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| author | Huan Liu Chao Lin Zhen Ma Hongbo Yu Shenghu Zhou |
| author_facet | Huan Liu Chao Lin Zhen Ma Hongbo Yu Shenghu Zhou |
| author_sort | Huan Liu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T16:44:25Z |
| format | Article |
| id | doaj.art-9b3714d23d9142a1b56e07dc48e579bd |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-12-10T16:44:25Z |
| publishDate | 2013-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-9b3714d23d9142a1b56e07dc48e579bd2022-12-22T01:41:07ZengMDPI AGMolecules1420-30492013-11-011811142581426710.3390/molecules181114258molecules181114258Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal StabilityHuan Liu0Chao Lin1Zhen Ma2Hongbo Yu3Shenghu Zhou4Research Institute of Applied Catalysis, Shanghai Institute of Technology, Shanghai 201418, ChinaDepartment of Physics, Faculty of Science, Ningbo University, Ningbo 315211, ChinaShanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, ChinaNingbo Institute of Materials Engineering and Technology, Chinese Academy of Sciences, Ningbo 315201, ChinaNingbo Institute of Materials Engineering and Technology, Chinese Academy of Sciences, Ningbo 315201, ChinaFe3O4 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.http://www.mdpi.com/1420-3049/18/11/14258solvothermal methodmagnetic Fe3O4 spheresp-nitrophenolgold catalysis |
| spellingShingle | Huan Liu Chao Lin Zhen Ma Hongbo Yu Shenghu Zhou Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability Molecules solvothermal method magnetic Fe3O4 spheres p-nitrophenol gold catalysis |
| title | Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability |
| title_full | Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability |
| title_fullStr | Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability |
| title_full_unstemmed | Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability |
| title_short | Gold Nanoparticles on Mesoporous SiO2-Coated Magnetic Fe3O4 Spheres: A Magnetically Separatable Catalyst with Good Thermal Stability |
| title_sort | gold nanoparticles on mesoporous sio2 coated magnetic fe3o4 spheres a magnetically separatable catalyst with good thermal stability |
| topic | solvothermal method magnetic Fe3O4 spheres p-nitrophenol gold catalysis |
| url | http://www.mdpi.com/1420-3049/18/11/14258 |
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