Abstract
A thiacalix[4]arene dissolved in NPOE for incorporation in a supported liquid membrane, is shown to ensure a transmembrane transport flux of Cd 2+ ions with an order of magnitude higher than that obtained with a very lipophilic carrier such as Lasalocide A, according to a mechanism of active facilitated transport (coupled to a pH gradient). Liquid–liquid (water-NPOE) extraction experiments confirmed the good affinity of the thiacalix[4]arene for the Cd 2+ ions at the interface between an aqueous medium of pH = 8 and NPOE organic phase, as well as its almost complete release in water when the pH of the aqueous phase is changed to acid.
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