Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Vitalii Kavun*, Monique A. van der Veen, Eveliina Repo

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
10 Downloads (Pure)

Abstract

Development of state-of-the-art selective adsorbent materials for recovery of rare earth elements (REEs) is essential for their sustainable usage. In this study, a metal-organic framework (MOF), MIL-101(Cr), was synthesized and post-synthetically modified with optimised loading of the organophosphorus compounds tributyl phosphate (TBP), bis(2-ethylhexyl) hydrogen phosphate (D2EHPA, HDEHP) and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex®-272). The materials were characterized and their adsorption efficiency towards Nd3+, Gd3+ and Er3+ from aqueous solutions was investigated. The MOF derivatives demonstrated an increase in adsorption capacity for Er3+ at optimal pH 5.5 in the order of MIL-101-T50 (37.2 mg g−1) < MIL-101-C50 (48.9 mg g−1) < MIL-101-H50 (57.5 mg g−1). The exceptional selectivity of the materials for Er3+ against transition metal ions was over 90%, and up to 95% in the mixtures with rare earth ions. MIL-101-C50 and MIL-101-H50 demonstrated better chemical stability than MIL-101-T50 over 3 adsorption−desorption cycles. The adsorption mechanism was described by the formation of coordinative complexes between the functional groups of modifiers and Er3+ ions.

Original languageEnglish
Article number110747
JournalMicroporous and Mesoporous Materials
Volume312
DOIs
Publication statusPublished - 2020

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Adsorption modelling
  • Chemical stability
  • Erbium
  • Metal-organic frameworks
  • Rare earth elements

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