abstract
Deep eutectic solvents (DESs) composed of a beta-diketone and phosphine oxides featuring different alkyl chain lengths were prepared and then employed as liquid-liquid extraction and dissolution media for the separation of iron, cobalt, neodymium, and dysprosium. In the dissolution the more sterically hindered DESs exhibited enhanced selectivity to neodymium, which was poorly separated using liquid-liquid extraction. The dissolution selectivity in less sterically hindered DESs could be controlled by the addition of organic acids with different alkyl chain lengths. Tuning steric environment of hydrophobic deep eutectic solvents improves dissolution selectivity of rare earth elements.
keywords
NDFEB MAGNETS; TRANSITION; OXIDES; ACID
subject category
Chemistry; Science & Technology - Other Topics
authors
Hanada, T; Schaeffer, N; Katoh, M; Coutinho, JAP; Goto, M
our authors
Nicolas Schaeffer
Assistant ResearcherProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
This research study was supported by the Environment Research and Technology Development Fund (JPMEERF20233002) and JSPS KAKENHI Grant Number 23K19186. The NMR analysis was performed at the Center of Advanced Instrumental Analysis, Kyushu University. This work was partly developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC). N. S. acknowledges the European Research Council (ERC) for the starting grant ERC-2023-StG-101116461.