New Cesium-Selective Hydrophilic Ligands:  UV Measures of Their Interactions toward Cs and Cs/Na Separation by Nanofiltration Complexation

Separating traces of cesium from aqueous medium containing large sodium amounts is a difficult problem because cesium and sodium ions have a similar behavior in aqueous medium. We selected a highly cesium-selective ligand in aqueous medium, and we determined the best conditions for using this ligand...

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Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2000-05, Vol.104 (17), p.4121-4128
Main Authors: Chitry, Frédéric, Pellet-Rostaing, Stéphane, Nicod, Laurence, Gass, Jean-Louis, Foos, Jacques, Guy, Alain, Lemaire, Marc
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container_issue 17
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container_title The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
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Lemaire, Marc
description Separating traces of cesium from aqueous medium containing large sodium amounts is a difficult problem because cesium and sodium ions have a similar behavior in aqueous medium. We selected a highly cesium-selective ligand in aqueous medium, and we determined the best conditions for using this ligand in a nanofiltration−complexation process in order to achieve Cs+/Na+ separation. We also tried to find a relation between the ligand structure and its activity toward cesium complexation. Tetrahydroxylated bis-crown-6 calix[4]arene was found to be very cesium selective (S = β(Cs+)/β(Na+) = 6600). Combined with a nanofiltration process, this ligand helped reaching 90% cesium retention in a highly concentrated aqueous medium ([NaNO3] = 3 mol/L).
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title New Cesium-Selective Hydrophilic Ligands:  UV Measures of Their Interactions toward Cs and Cs/Na Separation by Nanofiltration Complexation
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