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Sol-gel synthesis of SBA-15: Impact of HCl on surface chemistry

Abstract : Surface functionalisation of mesoporous silicas is critical to their application as sorbents and catalyst supports. Here we report the impact of chloride on the physicochemical properties of SBA-15, notably the surface density of reactive hydroxyl groups. Bulk and surface properties were characterised by N2 porosimetry, X-ray diffraction, SEM, TEM, FTIR spectroscopy, and Inverse gas chromatography (IGC). Increasing the HCl concentration from 0.1 → 2.0 M during the sol-gel preparation of SBA-15 increased the surface silanol coverage two-fold, and slightly widened mesopores from 4.2 to 4.9 nm. IGC reveals that the specific surface energy and corresponding surface polarity of SBA-15 correlate with surface silanol properties, and hence tuning the HCl concentration during SBA-15 synthesis offers a facile route to hydrophilic or hydrophobic silicas, and in turn a means to control their functionalisation and sorptive properties.
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https://hal.univ-lille.fr/hal-03155449
Contributeur : Lilloa Université de Lille <>
Soumis le : lundi 1 mars 2021 - 19:02:44
Dernière modification le : mardi 2 mars 2021 - 03:16:53

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Cyril Pirez, Jean-Charles Morin, Jinesh C. Manayil, Adam F. Lee, Karen Wilson. Sol-gel synthesis of SBA-15: Impact of HCl on surface chemistry. Microporous and Mesoporous Materials, Elsevier, 2018, Microporous and Mesoporous Materials, 271, pp.196-202. ⟨10.1016/j.micromeso.2018.05.043⟩. ⟨hal-03155449⟩

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