A series of calixcrown ethers for which the cavity size of the crown ring is varied from crown-6 to crown-7 to crown-8 were examined for the transport abilities toward alkali metal ions. These ligands were incorporated into supported liquid membranes (SLMs) and into polymer inclusion membranes (PIMs) composed of cellulose triacetate (CTA) as a support and 2-nitrophenyl octyl ether (NPOE) and tris(2-butoxyethyl) phosphate (TBEP) as a plasticizer. In both membrane systems, calixcrown-6 showed the best selectivity toward a cesium ion over other alkali metal ions. The polymeric CTA membrane showed more rapid transport rate as well as higher durability than did the SLMs.
Bibliographical noteFunding Information:
The authors wish to acknowledge the financial support of the Korea Research Foundation made in the program year of 1998 (Grant No. 1998-015-D00161).
- Calixcrown ether
- Polymer inclusion membrane
- Transport experiment
ASJC Scopus subject areas
- Analytical Chemistry