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Issue 56, 2018, Issue in Progress
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Speciation of lanthanide ions in the organic phase after extraction from nitrate media by basic extractants

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Abstract

A speciation study was carried out for lanthanide complexes formed in the organic phase after solvent extraction with quaternary ammonium and phosphonium nitrate extractants. These extractants are liquid at room temperature and were applied in their undiluted form. A comparison was made between the quaternary compound trihexyl(tetradecyl)phosphonium nitrate, the nitrate form of the commercial extractant Cyphos IL 101, and Aliquat 336 nitrate, the nitrate form of the commercial trialkylmethylammonium chloride extractant Aliquat 336 (alkyl = mixture of C8 and C10 chains). The structures of the lanthanide complexes across the entire lanthanide series (with the exception of promethium) were determined by a combination of solvent extraction techniques, FTIR, NMR, high-resolution steady-state luminescence spectroscopy, luminescence life time measurements, elemental analysis and EXAFS spectroscopy. The results suggest that the lanthanide ions form an anionic nitrate complex in the organic phase by coordinating with five bidentate nitrate ligands. Charge neutralization is provided by two counter cations of the extractant present in the outer coordination sphere of the complex. Furthermore, it is suggested that the pentanitrato complex is the sole lanthanide species that is formed in significant concentrations in the organic phase.

Graphical abstract: Speciation of lanthanide ions in the organic phase after extraction from nitrate media by basic extractants

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Article information


Submitted
09 Aug 2018
Accepted
07 Sep 2018
First published
14 Sep 2018

This article is Open Access

RSC Adv., 2018,8, 32044-32054
Article type
Paper

Speciation of lanthanide ions in the organic phase after extraction from nitrate media by basic extractants

B. Onghena, E. Papagni, E. R. Souza, D. Banerjee, K. Binnemans and T. Vander Hoogerstraete, RSC Adv., 2018, 8, 32044
DOI: 10.1039/C8RA06712K

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