Issue 9, 2023

A multi-faceted approach to probe organic phase composition in TODGA systems with 1-alcohol phase modifiers

Abstract

The effect of varying 1-alcohol alkyl chain length on extraction of lanthanides (Lns), H2O, and H+ was studied with tetraoctyl diglycolamide (TODGA) via solvent extraction coupled with FT-IR investigations. This multi-faceted approach provided understanding regarding the relationship between extracted Lns, H2O and H+, 1-alcohol volume fraction, and 1-alcohol alkyl chain length. Under acidic conditions there is competition with 1-alcohols and their ability to solubilize aggregates and incidentally induce third phase formation by increasing the extraction of H2O. At low 1-alcohol concentrations (5 vol%), the trend for 1-alcohol alkyl lengths in solubilizing the aggregates is 1-hexanol > 1-octanol > 1-decanol. Shorter alkyl chains suppress aggregation, ultimately resulting in lower H2O concentrations and less available TODGA to hydrogen bond with H+. Increasing the 1-alcohol concentration to 30 vol% results in the opposite trend, with longer alkyl chains suppressing aggregation. These results suggest this approach is effective at probing trends in the organic phase micro-structure, and indicates trends across the Ln period with various 1-alcohol alkyl chain lengths are a function of outer-sphere coordination.

Graphical abstract: A multi-faceted approach to probe organic phase composition in TODGA systems with 1-alcohol phase modifiers

Supplementary files

Article information

Article type
Paper
Submitted
06 Dec 2022
Accepted
09 Feb 2023
First published
20 Feb 2023
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2023,13, 6017-6026

A multi-faceted approach to probe organic phase composition in TODGA systems with 1-alcohol phase modifiers

A. A. Peroutka, S. S. Galley and J. C. Shafer, RSC Adv., 2023, 13, 6017 DOI: 10.1039/D2RA07786H

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