Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan.
Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Angew Chem Int Ed Engl. 2020 Dec 21;59(52):23461-23465. doi: 10.1002/anie.202008148. Epub 2020 Oct 19.
We demonstrate hydrogen-bonded structures of water in self-organized subnanoporous water treatment membranes obtained using synchrotron-based high-resolution soft X-ray emission spectroscopy. The ion selectivity of these water treatment membranes is usually understood by the size compatibility of nanochannels in the membrane with the Stokes radius of hydrated ions, or by electrostatic interaction between charges inside the nanochannels and such ions. However, based on a comparison between the hydrogen-bonded structures of water molecules in the nanochannels of the water treatment membrane and those surrounding the ions, we propose a definite contribution of structural consistency among the associated hydrogen-bonded water molecules to the ion selectivity. Our observation delivers a novel concept to the design of water treatment membranes where water molecules in the nanochannel can be regarded as a part of the material that controls the ion selectivity.
我们利用基于同步加速器的高分辨率软 X 射线发射光谱，展示了自组织亚纳滤水治疗膜中氢键合的水分子结构。这些水治疗膜的离子选择性通常通过膜中纳米通道与水合离子的斯托克斯半径的尺寸相容性，或通过纳米通道内部电荷与这些离子之间的静电相互作用来理解。然而，根据水治疗膜纳米通道中水分子的氢键合结构与周围离子的氢键合结构之间的比较，我们提出了与离子选择性相关的氢键合水分子之间结构一致性的明确贡献。我们的观察为水治疗膜的设计提供了一个新概念，其中纳米通道中的水分子可以被视为控制离子选择性的材料的一部分。
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