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Issue 15, 2012
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Amino-functionalized microporous hybrid silica membranes

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Abstract

The present study describes the effect of the incorporation of amino-functionalized terminating groups on the behaviour and performance of an organic–inorganic hybrid silica membrane. A primary amine, a mixed primary and secondary amine, and an imidazole functionality were selected. The molar ratio of the amino-functionalized precursors in the matrix forming 1,2-bis(triethoxysilyl)ethane (BTESE) precursor was varied in the range of 25–100 mol%. Strong water adsorption, which remains at temperatures up to 523 K, was found for all membranes. The observed low gas permeances and contrasting high water fluxes in pervaporation were explained in relation to the strong water adsorption. XPS measurements indicate a relation between the concentration of amino functional groups in the hybrid layers and the starting amine concentration of the sols. XPS measurements also revealed the existence of a maximum loading of the amino-functionalized precursor. Depending on the precursor, a maximum N/Si element ratio between 0.07 and 0.45 was found. At amine concentrations higher than a precursor dependent threshold value, membrane selectivity is constant over the range of amine concentrations. For alcohol/water (95/5 wt%) feed mixtures, the observed water concentrations in the permeate were over 90 wt% for EtOH and 95 wt% for n-BuOH dehydration.

Graphical abstract: Amino-functionalized microporous hybrid silica membranes

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Article information


Submitted
24 Oct 2011
Accepted
27 Jan 2012
First published
02 Mar 2012

J. Mater. Chem., 2012,22, 7258-7264
Article type
Paper

Amino-functionalized microporous hybrid silica membranes

G. G. Paradis, R. Kreiter, M. M. A. van Tuel, A. Nijmeijer and J. F. Vente, J. Mater. Chem., 2012, 22, 7258
DOI: 10.1039/C2JM15417J

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