Microcolumn lanthanide separation using bis-(2-ethylhexyl) phosphoric acid functionalized ordered mesoporous carbon materials

•HDEHP/ordered mesoporous carbons were prepared as a chromatographic material.•HDEHP-OMC have more efficient and higher maximal Eu3+ loading than LN Resin.•Small, unpressurized columns used without backpressure issues.•Chromatographic separation of Nd3+ and Eu3+ was achieved using HDEHP-OMC. Adjacen...

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Bibliographic Details
Published in:Journal of Chromatography A 2019-06, Vol.1595, p.248-256
Main Authors: Bertelsen, Erin R., Deodhar, Gauri, Kluherz, Kyle T., Davidson, Malcolm, Adams, Marisa L., Trewyn, Brian G., Shafer, Jenifer C.
Format: Article
Language:English
Subjects:
Bis-2-ethylhexyl phosphoric acid
Chromatography
Europium
Functionalized ordered mesoporous carbon
HDEHP
Neodymium
Rare earth elements
Separations
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Summary:•HDEHP/ordered mesoporous carbons were prepared as a chromatographic material.•HDEHP-OMC have more efficient and higher maximal Eu3+ loading than LN Resin.•Small, unpressurized columns used without backpressure issues.•Chromatographic separation of Nd3+ and Eu3+ was achieved using HDEHP-OMC. Adjacent lanthanides are among the most challenging elements to separate, to the extent that current separations materials would benefit from transformative improvement. Ordered mesoporous carbon (OMC) materials are excellent candidates, owing to their small mesh size and uniform morphology. Herein, OMC materials were physisorbed with bis-(2-ethylhexyl) phosphoric acid (HDEHP) and sorption of Eu3+ was investigated under static and dynamic conditions. The HDEHP-OMC materials displayed higher distribution coefficients and loading capacities than current state-of-the-art materials. Using a small, unpressurized column, a separation between Eu3+ and Nd3+ was achieved. Based on these experimental results, HDEHP-OMC have shown potential as a solid phase sorbent for chromatographic, intragroup, lanthanide separations.
ISSN:0021-9673
DOI:10.1016/j.chroma.2019.02.057