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GO-guided direct growth of highly oriented metal–organic framework nanosheet membranes for H2/CO2 separation†
Chemical Science ( IF 7.6 ) Pub Date : 2018-04-02 00:00:00 , DOI: 10.1039/c7sc04815g
Yujia Li 1 , Haiou Liu 1 , Huanting Wang 2 , Jieshan Qiu 1 , Xiongfu Zhang 1
Affiliation  

Highly oriented, ultrathin metal–organic framework (MOF) membranes are attractive for practical separation applications, but the scalable preparation of such membranes especially on standard tubular supports remains a huge challenge. Here we report a novel bottom-up strategy for directly growing a highly oriented Zn2(bIm)4 (bIm = benzimidazole) ZIF nanosheet tubular membrane, based on graphene oxide (GO) guided self-conversion of ZnO nanoparticles (NPs). Through our approach, a thin layer of ZnO NPs confined between a substrate and a GO ultrathin layer self-converts into a highly oriented Zn2(bIm)4 nanosheet membrane. The resulting membrane with a thickness of around 200 nm demonstrates excellent H2/CO2 gas separation performance with a H2 performance of 1.4 × 10−7 mol m−2 s−1 Pa−1 and an ideal separation selectivity of about 106. The method can be easily scaled up and extended to the synthesis of other types of Zn-based MOF nanosheet membranes. Importantly, our strategy is particularly suitable for the large-scale fabrication of tubular MOF membranes that has not been possible through other methods.

中文翻译:

GO 引导直接生长用于 H2/CO2 分离的高取向金属-有机框架纳米片膜†

高度定向的超薄金属有机框架 (MOF) 膜对实际分离应用很有吸引力,但这种膜的可扩展制备,特别是在标准管状载体上的制备仍然是一个巨大的挑战。在这里,我们报告了一种新的自下而上的策略,用于直接生长高度取向的 Zn 2 (bIm) 4 (bIm = 苯并咪唑) ZIF 纳米片管状膜,基于氧化石墨烯 (GO) 引导的 ZnO 纳米粒子 (NPs) 的自转换。通过我们的方法,限制在基板和 GO 超薄层之间的 ZnO NPs 薄层自转化为高度取向的 Zn 2 (bIm) 4纳米片膜。所得膜厚度约为 200 nm,表现出优异的 H 2 /CO2气体分离性能,H 2性能为1.4 × 10 -7 mol m -2 s -1 Pa -1,理想的分离选择性约为106。该方法可以很容易地放大并扩展到其他类型的合成锌基 MOF 纳米片膜。重要的是,我们的策略特别适用于通过其他方法无法实现的管状 MOF 膜的大规模制造。
更新日期:2018-04-02
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