SEPARATION OF LANTHANIDES(III) BY NANOFILTRATION-COMPLEXATION IN AQUEOUS MEDIUM

At first diethylenetriaminepentaacetic acid (DTPA) was combined with a nanofiltration (NF) system in order to separate Gd 3+ from La 3+ ions in aqueous medium. Combined with a Sepa MG-17 NF membrane (Osmonics), it allowed Gd 3+ retention to reach 95%, whereas La 3+ retention only reached 50%. Then,...

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Bibliographic Details
Published in:Separation science and technology 2001-03, Vol.36 (4), p.605-618
Main Authors: Chitry, Frédéric, Pellet-Rostaing, Stéphane, Gozzi, Christel, Lemaire, Marc
Format: Article
Language:English
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Summary:At first diethylenetriaminepentaacetic acid (DTPA) was combined with a nanofiltration (NF) system in order to separate Gd 3+ from La 3+ ions in aqueous medium. Combined with a Sepa MG-17 NF membrane (Osmonics), it allowed Gd 3+ retention to reach 95%, whereas La 3+ retention only reached 50%. Then, to improve this one-step separation, new hydrophilic ligands were synthesized. Bis(diethanol)amide-DTPA 1 combined with a NF system involving a Sepa MG-17 membrane allowed Gd 3+ retention to reach 87%, whereas La 3+ retention remained at 5%. Finally, the same nanofiltration-complexation system was used to separate an equimolar aqueous mixture of Gd 3+ , Pr 3+ , and La 3+ ions.
ISSN:0149-6395
1520-5754
DOI:10.1081/SS-100102949