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用于提高 CO 渗透性的 Matrimid 混合基质膜中沸石咪唑酯骨架 8 的磁取向和富集通道

Magnetically Aligned and Enriched Pathways of Zeolitic Imidazolate Framework 8 in Matrimid Mixed Matrix Membranes for Enhanced CO Permeability.

作者信息

van Essen Machiel, Montrée Esther, Houben Menno, Borneman Zandrie, Nijmeijer Kitty

机构信息

Membrane Materials and Processes, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

出版信息

Membranes (Basel). 2020 Jul 17;10(7):155. doi: 10.3390/membranes10070155.

DOI:10.3390/membranes10070155
PMID:32709108
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7408041/
Abstract

Metal-organic frameworks (MOFs) as additives in mixed matrix membranes (MMMs) for gas separation have gained significant attention over the past decades. Many design parameters have been investigated for MOF based MMMs, but the spatial distribution of the MOF throughout MMMs lacks investigation. Therefore, magnetically aligned and enriched pathways of zeolitic imidazolate framework 8 (ZIF-8) in Matrimid MMMs were synthesized and investigated by means of their N and CO permeability. Magnetic ZIF-8 (m-ZIF-8) was synthesized by incorporating FeO in the ZIF-8 structure. The presence of FeO in m-ZIF-8 showed a decrease in surface area and N and CO uptake, with respect to pure ZIF-8. Alignment of m-ZIF-8 in Matrimid showed the presence of enriched pathways of m-ZIF-8 through the MMMs. At 10 wt.% m-ZIF-8 incorporation, no effect of alignment was observed for the N and CO permeability, which was ascribed anon-ideal tortuous alignment. However, alignment of 20 wt.% m-ZIF-8 in Matrimid showed to increase the CO diffusivity and permeability (19%) at 7 bar, while no loss in ideal selectivity was observed, with respect to homogeneously dispersed m-ZIF-8 membranes. Thus, the alignment of MOF particles throughout the matrix was shown to enhance the CO permeability at a certain weight content of MOF.

摘要

在过去几十年中，金属有机框架材料（MOFs）作为混合基质膜（MMMs）用于气体分离的添加剂受到了广泛关注。人们对基于MOF的MMMs的许多设计参数进行了研究，但MOF在整个MMMs中的空间分布缺乏研究。因此，通过氮和一氧化碳渗透率合成并研究了Matrimid MMMs中沸石咪唑酯骨架8（ZIF-8）的磁排列和富集通道。通过在ZIF-8结构中引入FeO合成了磁性ZIF-8（m-ZIF-8）。与纯ZIF-8相比，m-ZIF-8中FeO的存在导致表面积以及氮和一氧化碳吸收量的降低。m-ZIF-8在Matrimid中的排列表明，通过MMMs存在m-ZIF-8的富集通道。在加入10 wt.%的m-ZIF-8时，未观察到氮和一氧化碳渗透率的排列效应，这归因于非理想的曲折排列。然而，20 wt.%的m-ZIF-8在Matrimid中的排列显示，在7巴时一氧化碳扩散率和渗透率增加（19%），同时相对于均匀分散的m-ZIF-8膜，未观察到理想选择性的损失。因此，在MOF的特定重量含量下，MOF颗粒在整个基质中的排列显示出可提高一氧化碳渗透率。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f723/7408041/8522853b70e0/membranes-10-00155-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f723/7408041/6a0616c0209b/membranes-10-00155-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f723/7408041/934b7e05602a/membranes-10-00155-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f723/7408041/81b19b00a759/membranes-10-00155-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f723/7408041/8522853b70e0/membranes-10-00155-g012.jpg

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