What question did this study set out to answer?

To assess and compare the dissolution capacity and underlying chemical mechanisms of lactic acid-based deep eutectic solvents against aqueous lactic acid solutions for extracting rare earth elements.

March 30, 2025Separation and Purification TechnologyOpen Access

Dissolution of rare earth elements: Exploring the ability of deep eutectic solvents and organic acid solutions, the case of lactic acid

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Authors

JCJulien CouturierEuropean Synchrotron Radiation Facility CLClément LevardCentre National de la Recherche Scientifique BCBlanche CollinCentre de Recherche et d’Enseignement de Géosciences de l’Environnement

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Overview

Comparative laboratory analysis demonstrates reduced dissolution capacity of deep eutectic solvents relative to aqueous lactic acid for rare earth elements, questioning their utility in metal...

Key Points

To assess and compare the dissolution capacity and underlying chemical mechanisms of lactic acid-based deep eutectic solvents against aqueous lactic acid solutions for extracting rare earth elements.
Tested the dissolution performance of a choline chloride and lactic acid deep eutectic solvent, its variations, 1 mol/L aqueous lactic acid, and pure water across concentrated rare earth phases (La, Nd, Gd, Dy, Y, and Yb).
Investigated chemical speciation, complex stability, and the role of the hydrogen bond acceptor using X-ray absorption spectroscopy.
All evaluated deep eutectic solvents demonstrated a lower dissolution capacity for concentrated rare earth elements than the 1 mol/L aqueous lactic acid solution.
X-ray absorption spectroscopy identified rare earth elements coordinated predominantly as lactate complexes in both solvent systems, with the choline chloride hydrogen bond acceptor playing no direct role in dissolution.
The formation and chemical stability of rare earth-lactate complexes acted as the primary limiting factor for solubilization in high-concentration materials.

Cite This Study

Couturier et al. (2025) studied this question.

synapsesocial.com/papers/6a1c40461567d2fc4d5fd44d https://doi.org/10.1016/j.seppur.2025.132740

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March 30, 2025Separation and Purification TechnologyOpen Access

Dissolution of rare earth elements: Exploring the ability of deep eutectic solvents and organic acid solutions, the case of lactic acid

View Full Paper

Ask AI

Bookmark

Authors

Discussion

Member takes

Overview

Comparative laboratory analysis demonstrates reduced dissolution capacity of deep eutectic solvents relative to aqueous lactic acid for rare earth elements, questioning their utility in metal...

Key Points

To assess and compare the dissolution capacity and underlying chemical mechanisms of lactic acid-based deep eutectic solvents against aqueous lactic acid solutions for extracting rare earth elements.
Tested the dissolution performance of a choline chloride and lactic acid deep eutectic solvent, its variations, 1 mol/L aqueous lactic acid, and pure water across concentrated rare earth phases (La, Nd, Gd, Dy, Y, and Yb).
Investigated chemical speciation, complex stability, and the role of the hydrogen bond acceptor using X-ray absorption spectroscopy.
All evaluated deep eutectic solvents demonstrated a lower dissolution capacity for concentrated rare earth elements than the 1 mol/L aqueous lactic acid solution.
X-ray absorption spectroscopy identified rare earth elements coordinated predominantly as lactate complexes in both solvent systems, with the choline chloride hydrogen bond acceptor playing no direct role in dissolution.
The formation and chemical stability of rare earth-lactate complexes acted as the primary limiting factor for solubilization in high-concentration materials.

Cite This Study

Couturier et al. (2025) studied this question.

synapsesocial.com/papers/6a1c40461567d2fc4d5fd44d https://doi.org/10.1016/j.seppur.2025.132740

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