UREA TRANSPORT THROUGH SUPPORTED LIQUID MEMBRANES USING SYNTHETIC CARRIERS

被引:16
|
作者
VANSTRAATENNIJENHUIS, WF
DEJONG, F
REINHOUDT, DN
THUMMEL, RP
BELL, TW
LIU, J
机构
[1] UNIV TWENTE,ORGAN CHEM LAB,7500 AE ENSCHEDE,NETHERLANDS
[2] UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204
[3] SUNY STONY BROOK,DEPT CHEM,STONY BROOK,NY 11794
关键词
SUPPORTED LIQUID MEMBRANES; CARRIER-MEDIATED TRANSPORT; UREA TRANSPORT; POLYAZA CARRIERS; MACROCYCLES;
D O I
10.1016/0376-7388(93)85192-Y
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
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.
引用
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页码:277 / 283
页数:7
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