分步成核原位自修复制备可卷曲大面积超薄 MOF 膜,Advanced Materials

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分步成核原位自修复制备可卷曲大面积超薄 MOF 膜
Advanced Materials ( IF 27.4 ) Pub Date : 2023-08-29 , DOI: 10.1002/adma.202307013
Caijiao Yu ₁ , Xixi Cen ₁ , Zhengqing Zhang ₂ , Yuxiu Sun ₂ , Wenjuan Xue ₂ , Zhihua Qiao ₂ , Michael D Guiver _{3,

4} , Chongli Zhong ₂

Affiliation

具有超高渗透率和良好气体选择性的超薄膜有可能大大降低分离工艺成本，但需要大面积膜的实际制备才能实现。金属有机框架（MOF）对于膜气体分离应用非常有吸引力。然而迄今为止，文献报道的MOF膜最大面积仅为100 cm ²左右。在本研究中，提出了一种新的分步成核原位自修复策略，首次能够制备沉积在廉价柔性聚合物膜支撑层上的大面积（2400 cm ² ）超薄且可卷曲的MOF膜，将聚乙烯醇（PVA）金属离子层和纯金属离子层结合在一起。纯金属离子层的主要作用是作为MOF膜生长的主要成核位点，而PVA金属离子层则作为缓释金属离子源，补充MOF晶体成核以修复任何缺陷。发生缺陷。膜组件是膜应用的必要组件，螺旋卷式组件是广泛应用于气体分离中最常见的组件形式之一。成功制备出4800 cm ²螺旋卷式膜组件，展示了大面积MOF膜的实用化。

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Step-Nucleation In Situ Self-Repair to Prepare Rollable Large-Area Ultrathin MOF Membranes

Ultrathin membranes with ultrahigh permeance and good gas selectivity have the potential to greatly decrease separation process costs, but it requires the practical preparation of large area membranes for implementation. Metal–organic frameworks (MOFs) are very attractive for membrane gas separation applications. However, to date, the largest MOF membrane area reported in the literature is only about 100 cm². In the present study, a new step-nucleation in situ self-repair strategy is proposed that enables the preparation of large-area (2400 cm²) ultrathin and rollable MOF membranes deposited on an inexpensive flexible polymer membrane support layer for the first time, combining a polyvinyl alcohol (PVA)‒metal-ion layer and a pure metal-ion layer. The main role of the pure metal-ion layer is to act as the main nucleation sites for MOF membrane growth, while the PVA‒metal-ion layer acts as a slow-release metal-ion source, which supplements MOF crystal nucleation to repair any defects occurring. Membrane modules are necessary components for membrane applications, and spiral-wound modules are among the most common module formats that are widely applied in gas separation. A 4800 cm² spiral-wound membrane module was successfully prepared, demonstrating the practical implementation of large-area MOF membranes.

更新日期：2023-08-29

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