Malonamide-Functionalized Ionic Liquid for Recovery of Rare-Earth Metals from End-Of-Life Products (Lamp Phosphors)

Robert Boyd, Ciaran Carroll, Sahra Dandil, Caglayan Acikgoz, Ritesh Ruhela, Peter Nockemann

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A novel functionalized ionic liquid, namely, malonamide-functionalized ionic liquid (MFIL) was synthesized and evaluated for the liquid-liquid extraction of rare-earth metals (REMs), transition, and other base metals from a hydrochloric acid medium. Theoretical calculations coupled with FT-IR studies were used to establish the mode of complexation between metal ions and the extracting moiety of MFIL. Uptake studies with multimetal feed solutions showed very good selectivity for REMs over other transition and base metals. Quantitative back extraction of REMs from loaded MFIL was accomplished using an acidic solution. MFIL showed preferential uptake of REMs over base and transition metals typically found in lamp phosphors.

Original languageEnglish
Pages (from-to)18706-18711
JournalACS Sustainable Chemistry and Engineering
Early online date09 Dec 2020
Publication statusPublished - 21 Dec 2020

Bibliographical note

Funding Information:
We acknowledge the services of ASEP (School of Chemistry and Chemical Engineering) for analysis. Seren Technologies Ltd. is acknowledged for funding the PhD studentship of C.C. R.R. acknowledges the EU for Marie Sklodowska Curie Fellowship (FP7-PEOPLE-2013-IIF) and the REMSIL (Rare-earth metal Separation with Ionic Liquids) grant (ID 627325).

Publisher Copyright:

Copyright 2020 Elsevier B.V., All rights reserved.


  • liquid-liquid extraction
  • malonamide-functionalized ionic liquid
  • phosphonium ionic liquids
  • rare-earth metals
  • transition metals

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment


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