2026-09-28 マックス・プランク研究所
The hierarchically structured membrane consists of three layers that enable the selective separation of ions using light and an electric field. © MPIKG
＜関連情報＞
- https://www.mpg.de/27003846/light-controls-the-separation-of-ions
- https://onlinelibrary.wiley.com/doi/10.1002/anie.7341167
光静電ゲートによる一価イオンと二価イオンの分離のための階層構造膜 Hierarchical Membrane for Photoelectrostatically Gated Monovalent-Divalent Ion Separation
Enis Oğuzhan Eren, Xuesong Xie, Zhi Li, Paolo Giusto
Angewandte Chemie International Edition Published: 10 September 2026
DOI:https://doi.org/10.1002/anie.7341167
ABSTRACT
Monovalent-divalent ion separation remains a significant challenge for the selective recovery of ions from aqueous solutions. Here, we report a hierarchical membrane composed of a poly(ionic liquid) photo-grafted onto a carbon nitride thin film supported on porous anodic aluminum oxide. Under concentration gradient-driven natural diffusion, the membrane establishes a baseline level of monovalent-divalent selectivity. However, upon application of light and bias as external stimuli, the hierarchical membrane enables light-assisted modulation of ion transport, resulting in a significant increase in monovalent-divalent selectivity by over 200 times for Li+/Mg2+ and over 500 times for K+/Mg2+. Ion selectivity arises from hydration-dependent mobility and electrostatic confinement within charged nanochannels. This work establishes a simple method to prepare hierarchical membranes for dynamically regulating ion transport and provides design principles for advanced monovalent-divalent ion separation.
