High-efficiency dysprosium-ion extraction enabled by a biomimetic nanofluidic channel

Weiwen Xin, Yanglansen Cui, Yongchao Qian, Tianchi Liu, Xiang-Yu Kong (), Haoyang Ling, Weipeng Chen, Zhehua Zhang, Yuhao Hu, Lei Jiang and Liping Wen ()
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Weiwen Xin: Chinese Academy of Sciences
Yanglansen Cui: Chinese Academy of Sciences
Yongchao Qian: Chinese Academy of Sciences
Tianchi Liu: Chinese Academy of Sciences
Xiang-Yu Kong: Chinese Academy of Sciences
Haoyang Ling: Chinese Academy of Sciences
Weipeng Chen: Chinese Academy of Sciences
Zhehua Zhang: Chinese Academy of Sciences
Yuhao Hu: Chinese Academy of Sciences
Lei Jiang: Chinese Academy of Sciences
Liping Wen: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Biological ion channels exhibit high selectivity and permeability of ions because of their asymmetrical pore structures and surface chemistries. Here, we demonstrate a biomimetic nanofluidic channel (BNC) with an asymmetrical structure and glycyl-L-proline (GLP) -functionalization for ultrafast, selective, and unidirectional Dy3+ extraction over other lanthanide (Ln3+) ions with very similar electronic configurations. The selective extraction mainly depends on the amplified chemical affinity differences between the Ln3+ ions and GLPs in nanoconfinement. In particular, the conductivities of Ln3+ ions across the BNC even reach up to two orders of magnitude higher than in a bulk solution, and a high Dy3+/Nd3+ selectivity of approximately 60 could be achieved. The designed BNC can effectively extract Dy3+ ions with ultralow concentrations and thereby purify Nd3+ ions to an ultimate content of 99.8 wt.%, which contribute to the recycling of rare earth resources and environmental protection. Theoretical simulations reveal that the BNC preferentially binds to Dy3+ ion due to its highest affinity among Ln3+ ions in nanoconfinement, which attributes to the coupling of ion radius and coordination matching. These findings suggest that BNC-based ion selectivity system provides alternative routes to achieving highly efficient lanthanide separation.

Date: 2024
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DOI: 10.1038/s41467-024-50237-9

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