Selective pervaporation of water through a non-selective microporous titania membrane by a dynamically induced molecular sieving mechanism

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Sekulic, Jelena and Elshof ten, Johan E. and Blank, Dave H.A. (2005) Selective pervaporation of water through a non-selective microporous titania membrane by a dynamically induced molecular sieving mechanism. Langmuir, 21 (2). pp. 508-510. ISSN 07437463

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Abstract:Pervaporation experiments were performed on microporous titania membranes using several binary liquids containing 2-20 wt % water. The membrane was nonselective in the separation of water from alcohols and p-dioxane but showed a remarkably high selectivity in the separation of water from ethylene glycol/water mixtures with 15 mol % water. The absence of selectivity under most conditions is explained by the large pore size (0.9 nm) of microporous titania. The high selectivity for water in the separation from ethylene glycol can be explained by the formation of a hydrogen-bonded network of ethylene glycol in the micropores, which blocks transport of ethylene glycol, while water can still permeate through. These networks are disrupted by water at higher concentrations, leading to full loss of membrane selectivity.
Item Type:Article
Copyright:© 2004 American Chemical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/52656
Official URL:http://dx.doi.org/10.1021/la047458p
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Metis ID: 224333