Sorption of rare-earth elements onto a ligand-associated media for pH-dependent extraction and recovery of critical materials

Toward recovering rare-earth elements, we prepared a solid-phase media that binds and elutes metals for extraction and enrichment. We report the synthesis and methodology for a solid-phase media that exhibits pH-dependent binding of aqueous rare-earth elements. The media shows pH-dependent binding o...

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Bibliographic Details
Published in:Separation and purification technology 2020-11, Vol.258
Main Authors: Hovey, Jessica L., Dardona, Mohammed, Allen, Matthew J., Dittrich, Timothy M.
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
Bis(ethylhexyl)amido DTPA
DTPA
ENGINEERING
Fly ash leachate
GENERAL AND MISCELLANEOUS
MATERIALS SCIENCE
Organically modified silica
Rare-earth elements
Solid-liquid extraction
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Summary:Toward recovering rare-earth elements, we prepared a solid-phase media that binds and elutes metals for extraction and enrichment. We report the synthesis and methodology for a solid-phase media that exhibits pH-dependent binding of aqueous rare-earth elements. The media shows pH-dependent binding of NdIII and retains efficiency over at least six cycles of binding and elution. Mixed solutions of rare-earth elements demonstrated a preference for mid and heavy rare-earth elements based on thermodynamic binding preferences of the ligand, and selectivity for rare-earth elements over iron and aluminum were observed with coal fly ash leachate. In conclusion, we expect this new recovery method to be a significant step towards aqueous-based extraction and enrichment of critically important rare-earth elements.
ISSN:1383-5866
1873-3794