Extraction of Rare Earths in Ionic Liquids Via Competitive Ligand Complexation between TODGA and DTPA

Jérémy Dehaudt, Neil J. Williams, Huimin Luo, Sheng Dai

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

With increasing demand and prospective scarcity of rare earths, the capacity to separate these elements with high selectivity is a critical challenge in hydrometallurgy. We evaluate in this article the capacity of N,N,N’,N’-tetra-n-octyl diglycolamide (TODGA) to separate lanthanides in both organic solvent and ionic liquids (ILs) using the holdback reagent diethylenetriaminepentaacetic acid (DTPA) in the aqueous phase. Totally, 10 imidazolium-based ILs with various hydrophobicity were studied herein: [C n mim][NTf 2 ] and [C n mim][BETI] (n = 2,4,6,8,10). In this process, selectivity for light lanthanides was obtained owing to a competitive complexation between TODGA and DTPA.

Original languageEnglish
Pages (from-to)574-582
Number of pages9
JournalSolvent Extraction and Ion Exchange
Volume36
Issue number6
DOIs
StatePublished - Sep 19 2018

Funding

This work was supported by the US Department of Energy, Office of Science, Division of Chemical Sciences, Geosciences, and Biosciences. This work was supported by the US Department of Energy, Office of Science, Division of Chemical Sciences, Geosciences, and Biosciences.

Keywords

  • TODGA
  • cation exchange
  • ionic liquids
  • lanthanides

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