Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 2, Issue 7, Pages 1910-1917Publisher
AMER CHEMICAL SOC
DOI: 10.1021/sc500255n
Keywords
Rare earth elements; Ionic liquids; Separation; Acidic extractant; Saponification
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Funding
- Collaborative Research and Development Grant Program [CRDPJ-445682-12]
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Rare earth elements (REEs) are critical materials in many cutting-edge technology products. Di(2-ethylhexyl)phosphate (HDEHP) and 2-ethyl(hexyl) phosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) are the most commonly used industrial extractants in individual REE separation However, acidic extractants, such as HDEHP and HEH[EHP], must be saponified for REEs separation, which often releases millions of tons of saponification wastewater into the environment annually. To develop effective and environmentally friendly extraction protocols for the BEE separation industry, HDEHP and HEH[EHP] were prepared as acid-base coupling bifunctional ionic liquid extractants, and their extraction behavior and stripping properties for REEs were investigated.
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