3D Hexagonal Mesoporous Silica and Its Organic Functionalization for High CO2 Uptake |
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| Authors: | Arghya Dutta Dr. Mahasweta Nandi Dr. Manickam Sasidharan Prof. Dr. Asim Bhaumik |
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| Affiliation: | 1. Department of Materials Science, Indian Association for the Cultivation of Science, 2A & B, Raja S.C. Mullick Road, Jadavpur, Kolkata 700 032 (India), Fax: (+91)?33‐2473‐2805;2. Integrated Science Education and Research Centre (ISERC), Visva‐Bharati University, Santiniketan, Birbhum, West Bengal 731235 (India);3. Department of Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo‐machi, Saga, 840‐8502 (Japan) |
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| Abstract: | Highly ordered 3D‐hexagonal mesoporous silica HMS‐3 and its vinyl‐ and 3‐chloropropyl‐functionalized analogues HMS‐4 and ‐5, respectively, are synthesized under strongly alkaline conditions at 277 K. Tetraethyl orthosilicate, vinyltrimethoxysilane, and 3‐chloropropyltrimethoxysilane are used as silica sources, and cetyltrimethylammonium bromide as the structure‐directing agent. The 3D‐hexagonal pore structures of HMS‐3, 4‐, and ‐5 were confirmed by powder XRD and high‐resolution TEM studies. Brunauer–Emmett–Teller surface areas of these materials are 1353, 1211, and 603 m2 g?1 for HMS‐3, ‐4, and ‐5, respectively. Among these materials, vinyl‐functionalized mesoporous material HMS‐4 adsorbs the highest CO2 (5.5 mmol g?1, 24.3 wt %) under 3 bar pressure at 273 K. The 3D‐hexagonal pore openings, very high surface area, and cagelike mesopores as well as organic functionalization could be responsible for very high CO2 uptakes of these materials compared to other related mesoporous silica‐based materials. |
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| Keywords: | adsorption carbon dioxide fixation mesoporous materials organic functionalization silica |
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