Synergistic coordination-encapsulation in eutectic mixture enables robust lanthanides capture at multi-scenarios

The strategic significance of lanthanides (Ln) in critical technologies necessitates sustainable extraction methods, yet conventional solvent extraction systems face persistent challenges such as environmental toxicity and limited medium adaptability, highlighting the urgent need for novel platforms that combine high efficiency, environmental compatibility, and broad-spectrum applicability. In this study, we present an innovative eutectic mixture (EM) comprising N, N, N′, N′ -tetraoctyl diglycolamide (TODGA) and di-(2-ethylhexyl)phosphoric acid (HDEHP), which pioneers exceptional extraction performance across all lanthanides in an unprecedentedly wide acidity range (pH 3.0 to 3.0 M HNO 3 ), achieving remarkable single-stage distribution ratios ( D Ln ) of 200–2000. Additionally, such a system demonstrates superior cycling stability and operational versatility under diverse industrial scenarios. Through multiscale characterization techniques, we elucidate for the first time the synergistic “coordination-encapsulation” mechanism: TODGA and HDEHP self-assemble into reverse micellar structures, enabling highly efficient lanthanide enrichment through concerted coordination and spatial encapsulation effects. The modular EM design paradigm and elucidated synergistic mechanism not only establish a transformative framework for low-volatility solvent development but also provide pivotal insights for sustainable rare earth resource recovery. This work advances fundamental understanding of supramolecular assembly in solvent extraction while offering practical solutions for industrial implementation.