Abstract We propose a strategy for rapid in situ fabrication of zeolitic imidazolate framework-8 (ZIF-8) hybrid membrane with assistance of the two dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets at room temperature. The negatively charged g-C3N4 nanosheets with abundant nitrogen coordinating sites are capable to capture and anchor Zn2+ and thus provide a large number of heterogeneous nucleation sites for the formation of initial ZIF-8 crystals. During the cyclical spin coating of the Zn2+/g-C3N4 nanosheets and the ligand (2-methylimidazole), the in situ formed ZIF-8 crystal nucleus on g-C3N4 nanosheets promote the further growth of continues defect-free membranes. The ZIF-8/g-C3N4 membrane with thickness of ∼240 nm can be obtained using this strategy within 30 min at room temperature, which is attractive for fast and facile preparation of molecular sieving membranes. Moreover, it exhibits promising H2/CO2 separation performance with the selectivity up to 42, which is superior to many other ZIF-8 membranes.

中文翻译：

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通过超薄金属有机骨架膜高效分离 H 2 /CO 2

摘要 我们提出了一种在室温下借助二维 (2D) 石墨氮化碳 (g-C3N4) 纳米片快速原位制备沸石咪唑酯骨架-8 (ZIF-8) 杂化膜的策略。带负电荷的 g-C3N4 纳米片具有丰富的氮配位点，能够捕获和锚定 Zn2+，从而为初始 ZIF-8 晶体的形成提供大量异质成核位点。在Zn2+/g-C3N4纳米片和配体（2-甲基咪唑）的循环旋涂过程中，g-C3N4纳米片上原位形成的ZIF-8晶核促进了连续无缺陷膜的进一步生长。使用该策略可以在室温下 30 分钟内获得厚度约为 240 nm 的 ZIF-8/g-C3N4 膜，这对于快速简便地制备分子筛膜具有吸引力。此外，它表现出有希望的 H2/CO2 分离性能，选择性高达 42，优于许多其他 ZIF-8 膜。