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High-efficiency dysprosium-ion extraction enabled by a biomimetic nanofluidic channel
Weiwen Xin1, Yanglansen Cui1, Yongchao Qian1
1CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China.
Nature Communications
|July 12, 2024
Summary
This study introduces a biomimetic nanofluidic channel for highly selective and ultrafast extraction of dysprosium (Dy3+) ions from other rare earth elements. This innovation aids in rare earth recycling and environmental protection.
Area of Science:
- Nanotechnology
- Materials Science
- Separation Science
Background:
- Biological ion channels achieve ion selectivity through asymmetric structures and surface chemistry.
- Lanthanide (Ln3+) ions possess similar electronic configurations, making their separation challenging.
Purpose of the Study:
- To develop a biomimetic nanofluidic channel (BNC) for selective and ultrafast extraction of dysprosium (Dy3+) ions.
- To investigate the mechanism of enhanced selectivity and permeability in nanoconfined environments.
Main Methods:
- Fabrication of a BNC with asymmetrical structure and glycyl-L-proline (GLP) functionalization.
- Conductivity measurements to assess ion transport across the BNC.
- Theoretical simulations to elucidate binding affinities and selectivity mechanisms.
Main Results:
- Achieved ultrafast and unidirectional Dy3+ extraction over other Ln3+ ions.
- Demonstrated a high Dy3+/Nd3+ selectivity of approximately 60.
- Purified neodymium (Nd3+) ions to 99.8 wt.% purity.
- Observed Ln3+ ion conductivities up to two orders of magnitude higher than in bulk solutions.
Conclusions:
- The BNC's design amplifies chemical affinity differences in nanoconfinement, enabling selective Dy3+ extraction.
- The preferential binding of Dy3+ is attributed to the coupling of ion radius and coordination matching.
- BNC-based systems offer a promising alternative for efficient lanthanide separation, supporting resource recycling and environmental sustainability.
