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Magnetic Field Directed Rare-Earth Separations.
- Source :
-
Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2020 Jan 27; Vol. 59 (5), pp. 1851-1856. Date of Electronic Publication: 2019 Dec 12. - Publication Year :
- 2020
-
Abstract
- The separation of rare-earth ions from one another is challenging due to their chemical and physical similarities. Nearly all rare-earth separations rely upon small changes in ionic radii to direct speciation or reactivity. Herein, we show that the intrinsic magnetic properties of the rare-earth ions impact the separations of light/heavy and selected heavy/heavy binary mixtures. Using TriNOx <superscript>3-</superscript> ([{(2- <superscript>t</superscript> BuNO)C <subscript>6</subscript> H <subscript>4</subscript> CH <subscript>2</subscript> } <subscript>3</subscript> N] <superscript>3-</superscript> ) rare-earth complexes, we efficiently and selectively crystallized heavy rare earths (Tb-Yb) from a mixture with light rare earths (La and Nd) in the presence of an external Fe <subscript>14</subscript> Nd <subscript>2</subscript> B magnet, concomitant with the introduction of a concentration gradient (decrease in temperature). The optimal separation was observed for an equimolar mixture of La:Dy, which gave an enrichment factor of EF <subscript>La:Dy</subscript> =297±31 for the solid fraction, compared to EF <subscript>La:Dy</subscript> =159±22 in the absence of the field, and achieving a 99.7 % pure Dy sample in one step. These results indicate that the application of a magnetic field can improve performance in a molecular separation system for paramagnetic rare-earth cations.<br /> (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1521-3773
- Volume :
- 59
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Angewandte Chemie (International ed. in English)
- Publication Type :
- Academic Journal
- Accession number :
- 31610094
- Full Text :
- https://doi.org/10.1002/anie.201911606