自底向上合成生长溶液直接组装纳米片制备ZIF-8膜

IF 4.9 Q1 ENGINEERING, CHEMICAL
Xuekui Duan , Pınar Kaya , Heng-Yu Chi , Berna Topuz , Kumar Varoon Agrawal
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引用次数: 1

摘要

金属有机框架(MOFs)具有固有的多孔结构和丰富的结构和化学特征。几种孔径与气体分子大小相当的MOFs吸引了人们对形成选择性膜层的兴趣。因此,以纳米片形态合成MOFs是非常有吸引力的,因为可以使用高度可扩展的过滤涂层来制造MOF膜。然而,传统的基于纳米片的加工路线需要几个加工步骤,包括离心来制备涂层分散体。在此,我们报道了通过纳米片的直接组装来容易地制备沸石咪唑酸酯骨架(ZIF)膜。ZIF-8纳米片是通过直接自下而上的合成路线获得的,其中结晶被优化以获得大的、具有良好刻面的40nm厚的纳米片。通过在多孔聚合物载体上直接过滤生长溶液而无需对纳米片进行任何进一步纯化,制备了优先沿平面外c方向取向的膜。这也确保了只使用少量的前体溶液,最大限度地减少浪费。所获得的膜紧凑且没有针孔缺陷,并且在25°C下在3000以上产生H2/C3H8的理想选择性。我们预计,这种方法可以应用于几种可以以纳米片形态合成的MOF,从而推进MOF膜的可扩展性前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fabrication of ZIF-8 membranes by direct assembly of nanosheets from bottom-up synthesis growth solution

Fabrication of ZIF-8 membranes by direct assembly of nanosheets from bottom-up synthesis growth solution

Metal-organic frameworks (MOFs) host intrinsically porous structure and rich structural and chemical features. Several MOFs with pore aperture comparable to the size of gas molecules have attracted interest to form the selective layer of membranes. Synthesis of MOFs in nanosheet morphology is highly attractive for this because one can use highly-scalable filter coating to make MOF membranes. However, conventional nanosheet based processing route require several processing steps including centrifugation to prepare a coating dispersion. Herein, we report facile preparation of zeolitic imidazolate frameworks (ZIF) membranes by a straightforward assembly of nanosheets. ZIF-8 nanosheets were obtained by a direct bottom-up synthesis route where crystallization was optimized to obtain large, well-faceted 40-nm-thick nanosheets. Membranes, preferentially oriented along the c-out-of-plane direction, were fabricated by directly filtering the growth solution over a porous polymeric support without any further purification of nanosheets. This also ensures that only a small amount of precursor solution is used minimizing waste. The obtained membranes were compact and free of pinhole defects and yielded H2/C3H8 ideal selectivity over 3000 at 25 °C. We anticipate that this approach can be applied to several MOFs which can be synthesized in nanosheet morphology, advancing the scalability prospects of MOF membranes.

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