Issue 11, 2013

Grafting of paired 3-aminopropyltrialkoxy silanes onto mesoporous silica and adsorptions of isomers of benzenedialdehydes

Abstract

A pair of 3-aminopropyltriethoxysilane molecules coupled with m- and p-benzenedialdehydes are grafted onto SBA-15 mesoporous silica, followed by the removal of benzenedialdehyde by hydrolysis. These paired 3-aminopropyl-grafted SBA-15, denoted (m)N- and (p)N-SBA-15, respectively, adsorb their own template benzenedialdehydes with a larger Langmuir constant KL than in other combinations of adsorbates and adsorbents. In addition, KL for the m-isomer is larger in the adsorption on (m)N-SBA-15 than on (p)N-SBA-15 and vice versa for the p-isomer. In contrast to this quadruple preference in the adsorption, a larger KL in the adsorption of the m-isomer onto the (m)N-adsorbent than onto the (p)N-adsorbent is the only adsorption preference that is observed in the case of Cab-O-sil M7D-based adsorbents prepared by the same procedure. The difference between the two kinds of silicas can be attributed to the surface curvature, concave or convex on a nanometre scale, which is supported by the evidence from spectroscopic analyses.

Graphical abstract: Grafting of paired 3-aminopropyltrialkoxy silanes onto mesoporous silica and adsorptions of isomers of benzenedialdehydes

Supplementary files

Article information

Article type
Paper
Submitted
19 Dec 2012
Accepted
18 Jan 2013
First published
22 Jan 2013

Phys. Chem. Chem. Phys., 2013,15, 3946-3954

Grafting of paired 3-aminopropyltrialkoxy silanes onto mesoporous silica and adsorptions of isomers of benzenedialdehydes

H. Yoshitake, T. Koizumi, I. Kawamura and A. Naito, Phys. Chem. Chem. Phys., 2013, 15, 3946 DOI: 10.1039/C3CP44592E

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