Lv Yinjie, Dong Lei, Cheng Lvyang, Gao Tianyi, Wu Cong, Chen Xin, He Tao, Cui Yuanyuan, Liu Wei
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Laboratory for Membrane Materials and Separation Technology, Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China.
ACS Appl Mater Interfaces. 2023 Oct 4;15(39):46261-46268. doi: 10.1021/acsami.3c10113. Epub 2023 Sep 22.
Two-dimensional membranes have shown promising potential for ion-selective separation due to their well-defined interlayer channels. However, the typical "trade-off" effect of throughput and selectivity limits their developments. Herein, we report a precise tailoring of monovalent cation sieving technology with enhanced water throughput via the intercalation of graphene-oxide membranes with selective crown ethers. By tuning the lamellar spacing of graphene oxide, a critical interlayer distance (∼11.04 Å) is revealed to maximize water flux (53.4 mol m h bar) without sacrificing ion selectivity. As a result, the elaborately enlarged interlayer distance offers improved water permeance. Meanwhile, various specific cations with remarkably high selectivity can be separated in mixed solutions because of the strong chelation with crown ethers. This work opens up a new avenue for high-throughput and precise regulation of ion separations for various application scenarios.
二维膜因其明确的层间通道在离子选择性分离方面展现出了良好的潜力。然而，通量和选择性之间典型的“权衡”效应限制了它们的发展。在此，我们报道了一种通过将氧化石墨烯膜与选择性冠醚插层来精确定制一价阳离子筛分技术，从而提高水通量。通过调节氧化石墨烯的层间距，发现了一个临界层间距离（约11.04 Å），可在不牺牲离子选择性的情况下使水通量最大化（53.4 mol m⁻² h⁻¹ bar⁻¹）。结果，精心扩大的层间距提高了水渗透率。同时，由于与冠醚的强螯合作用，在混合溶液中可以分离出具有极高选择性的各种特定阳离子。这项工作为各种应用场景下离子分离的高通量和精确调控开辟了一条新途径。
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