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

Pirez, Cyril, Morin, Jean-Charles, Manayil, Jinesh, Lee, Adam and Wilson, Karen (2018). Sol-gel synthesis of SBA-15:Impact of HCl on surface chemistry. Microporous and Mesoporous Materials, 271 , pp. 196-202.

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.

Publication DOI: https://doi.org/10.1016/j.micromeso.2018.05.043
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > Chemical engineering & applied chemistry
Engineering & Applied Sciences > European Bioenergy Research Institute (EBRI)
Additional Information: © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: SBA-15,Hydrothermal synthesis,Silanol density,Surface energy,Inverse gas chromatography (IGC)
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Related URLs: https://www.sci ... 3020?via%3Dihub (Publisher URL)
Published Online Date: 2018-11-15
Published Date: 2018-11-15
Authors: Pirez, Cyril
Morin, Jean-Charles
Manayil, Jinesh
Lee, Adam
Wilson, Karen ( 0000-0003-4873-708X)

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