Urea transport through supported liquid membranes using synthetic carriers

Straaten-Nijenhuis van, Wilma F. and Jong de, Feike and Reinhoudt, David N. and Thummel, Randolph P. and Bell, Thomas W. and Liu, Jia (1993) Urea transport through supported liquid membranes using synthetic carriers. Journal of Membrane Science, 82 (3). pp. 277-283. ISSN 0376-7388

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Abstract:	Urea can be transported through a supported liquid membrane (Accurel/NPOE) by carriers such as metallomacrocycles and polyaza (cleft-type) receptors. The urea flux is increased by a factor 4¿8 using polyaza receptors and by a factor 10¿15 using metallomacrocycles containing a salophene unit in which a uranyl cation is incorporated. These carriers have a high hydrophobicity and do not significantly leak from the membrane phase into the aqueous phases. The structure of the receptors and the type and number of binding sites have a pronounced influence on the transport rate. The lower urea fluxes found for the polyaza (cleft-type) carriers are most likely caused by a weaker complexation (only H-bond interactions). No transport is observed for carriers which form intramolecular H-bonds. Although lower fluxes are obtained than with a commercial haemodialysis membrane (Cuprophan), the selectivity of transport may be much higher using carrier-mediated transport.
Item Type:	Article
Copyright:	© 1993 Elsevier Science
Research Group:	Supramolecular Chemistry and Technology (SMCT) Membrane Science and Technology (MST)
Link to this item:	http://purl.utwente.nl/publications/12568
Official URL:	http://dx.doi.org/10.1016/0376-7388(93)85192-Y
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