Abstract The performance of mixed matrix membranes (MMMs) is usually limited by thick separation layer, low filler loading, and boundary defect between polymer and filler. Herein, a new two-dimensional metal-organic framework (2D MOF), named BUT-203, is designed and synthesized. Remarkably, the micron-sized crystals of this MOF could be readily delaminated into nanosheets with thickness of ca. 3 nm and lateral size of hundreds of nanometers to several microns. This delaminated nanosheets with high dispersibility in ethanol have a good compatibility with the polycation polymer polyethyleneimine (PEI). Under the optimum condition, a thin (ca. 70 nm) and high filler loading (up to ca. 73%) MMM, named BUT-203/PEI-HPAN(73) can be fabricated on macroporous hydrolyzed polyacrylonitrile (HPAN) substrate by a simple blending-spin coating method. This membrane shows a high water permeance up to 870 L/(m2·h·MPa) and high rejections (over 97.9%) for anionic dye molecules. In addition, this membrane exhibits a long term running stability, high dye desalination ability, and excellent antifouling property. These results suggest the usefulness of the membrane in nanofiltration, and simultaneously this work demonstrates that rationally designed 2D MOFs have great potential as filler materials in fabricating MMMs for various applications.

中文翻译：

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一种用于高渗透纳滤的薄高负载二维 MOF 纳米片基混合基质膜

摘要 混合基质膜（MMMs）的性能通常受到分离层厚、填料负载量低以及聚合物与填料之间的边界缺陷的限制。在此，设计并合成了一种名为 BUT-203 的新型二维金属有机骨架（2D MOF）。值得注意的是，这种 MOF 的微米级晶体可以很容易地分层为厚度为约 10 的纳米片。3纳米和数百纳米到几微米的横向尺寸。这种在乙醇中具有高分散性的分层纳米片与聚阳离子聚合物聚乙烯亚胺（PEI）具有良好的相容性。在最佳条件下，可以在大孔水解聚丙烯腈 (HPAN) 基材上制造薄（约 70 nm）和高填充量（高达约 73%）的 MMM，命名为 BUT-203/PEI-HPAN(73)一种简单的混合旋涂方法。该膜显示出高达 870 L/(m2·h·MPa) 的高透水性和对阴离子染料分子的高截留率（超过 97.9%）。此外，该膜表现出长期运行稳定性、高染料脱盐能力和优异的防污性能。这些结果表明膜在纳滤中的有用性，同时这项工作表明，合理设计的 2D MOF 作为填充材料具有巨大的潜力，可用于制造用于各种应用的 MMM。