Supported liquid membranes macrocyclic carriers

Shukala JP, Kumar A, and Singh RK. Macrocycle-mediated selective transport of plutonium (IV) nitrate through bulk liquid and supported liquid membranes using dicyclohexano-18-crown-6 as mobile carrier. Sep Sci Technol 1992 27 447 65. 

Shukla, J.P., Kumar, A., and Singh, R.K., Effect of solvent type on neutral macrocycle facilitated transport of uranyl ions across supported liquid membranes using dicyclohexano 18-crown-6 as carrier. Radiochim. Acta, 1992, 57 185-194. 

Wieczorek, P. (1997). Factors influencing the transport of tryptophan hydrochloride through supported liquid membranes containing macrocyclic carriers. J. Membr. Sci., 127, 87-92. 

Transport Selectivity. For separation purposes, the selectivity of transport by macrocyclic carriers through supported liquid membranes has been investigated extensively. The transport selectivity of a carrier towards two different cations M/ and is obtained by competition experiments in which both M", and were present in the receiving phase. 

The well known complexing properties of macrocyclic compounds towards metal ions have led to their incorporation into polymeric matrices. Polymer-supported crown ethers have many advantages, such as easy handling and recoverability when used for the removal of the toxic metal ions from the environment. Crown ether-, calixarene-, calixcrown- and cyclodextrin- based polymers have been recently receiving attention as the new polymers and may be processed into materials suitable as the extractant (solvent extraction), collector (ion flotation) or the ion carrier (transport across liquid membranes or ion selective electrodes). 

---