具有高度有序骨架纳米孔的共价三嗪骨架膜可实现稳健和精确的分子/离子分离,Journal of Membrane Science

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具有高度有序骨架纳米孔的共价三嗪骨架膜可实现稳健和精确的分子/离子分离
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.memsci.2019.117525
Guiliang Li , Wen Wang , Qile Fang , Fu Liu

摘要具有可控孔径和稳定结构的二维共价三嗪骨架（2D-CTF）是一类新型的用于构建分离膜材料的二维构件。在这项工作中，我们使用微界面法合成了具有高结晶度和优异溶剂分散性的少层 2D-CTF-1 纳米片。通过几层 2D-CTF-1 纳米片的过滤组装制备的 2D-CTF-1 膜由于其超低的溶剂-界面相互作用和丰富的面内孔而表现出优异的渗透性，水渗透率为 141.5 L m −2 h−1 在 1 bar。骨架孔被证明是2D-CTF-1膜上的主要传输通道，其稳定且不受外压变形。还展示了基于骨架孔（1.39 nm）截断值的尺寸筛选，这使 2D-CTF-1 膜在精确分子/离子筛分中具有巨大的应用潜力。此外，在水性环境中稳定的层状结构使2D-CTF-1膜在长期运行中具有出色的分离性能，持续保持高渗透性和选择性。因此，这项工作显示了 2D-CTF-1 在分离领域作为 2D 膜构建构建块的有前景的应用。

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Covalent triazine frameworks membrane with highly ordered skeleton nanopores for robust and precise molecule/ion separation

Abstract Two dimensional covalent triazine frameworks (2D-CTF) with controlled pore size and stable structure are a new class of 2D building blocks for constructing separation membrane materials. In this work, we synthesize few-layer 2D-CTF-1 nanosheets with high crystallinity and excellent solvent dispersion using a micro-interface method. The as-prepared 2D-CTF-1 membrane via filtration assembly of few-layer 2D-CTF-1 nanosheets exhibits superior permeability due to its ultralow solvent-interface interaction and the abundant in-plane pores, with a water permeance of 141.5 L m−2 h−1 at 1 bar. The skeleton-pores are proved to be the main transfer channels on 2D-CTF-1 membrane, which are stable and nondeformable by external pressure. Size screening based on the cut-off of skeleton-pore (1.39 nm) is also demonstrated, which enables 2D-CTF-1 membrane a huge application potential in precise molecule/ion sieving. Besides, a stable layered structure in aqueous environment renders 2D-CTF-1 membrane with outstanding separation performance in the long-term running, continuously keeping high permeability and selectively. Thus, this work shows a promising application of 2D-CTF-1 as building blocks for 2D membrane construction in the separation field.

更新日期：2020-02-01

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