A1 Journal article (refereed), original research

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


Open Access publication

Publication Details
Authors: Kavun Vitalii, van der Veen Monique, Repo Eveliina
Publisher: Elsevier
Publication year: 2020
Language: English
Related Journal or Series Information: Microporous and Mesoporous Materials
ISSN: 1387-1811
eISSN: 1873-3093
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2020110689605

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.


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Last updated on 2020-10-11 at 08:14