Mixed matrix membranes with highly dispersed MOF nanoparticles for improved gas separation
Mixed matrix membranes with highly dispersed MOF nanoparticles for improved gas separation
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具有高度分散的 MOF 纳米粒子的混合基质膜，可改善气体分离
DOI：
10.1016/j.seppur.2021.119449
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发表时间：
2021-08-11
影响因子：
8.6
通讯作者：
Jin, Jian
中科院分区：
文献类型：
--
作者：
Shi, Yapeng;Wu, Shanshan;Jin, Jian
金属有机骨架（MOFs）具有良好的分子筛性能，是制备混合基质膜（MMM）的理想填料。然而，MOF纳米颗粒不易分散，这限制了其在高MOF负载的MMM中的应用。在这项研究中，通过配位相互作用（abbre. IPD@ZIF-8）。得益于高稳定性和高分散性的IPD@ZIF-8溶液，实现了具有高纳米颗粒负载含量和优异均匀性的MMM。通过对ZIF-8纳米粒子表面进行IPD修饰，在强氢键的作用下，ZIF-8纳米粒子与6 FDA-Durene聚酰亚胺（PI）聚合物基体之间的界面亲和性大大提高。气体渗透结果表明，IPD@ZIF-8混合PI的H2渗透率（PI/IPD@ZIF-8）MMM在负载量为45wt%时可达8000 Barrer，相应的H2/CH 4和H2/N2气体对的理想选择性分别为15.1和13.0，分别提高了46.6%和32.7%。与ZIF-8混合PI（PI/ZIF-8）MMM相比，PI/IPD@ZIF-8 MMM的综合分离性能超过了2008年Robeson的上限。IPD的表面改性提高了PI/IPD@ZIF-8 MMM的抗CO2塑化性能，从21 bar提高到30 bar。本研究为MOF纳米粒子的表面改性提供了一种简便易行的方法，为制备高填充量、高质量的MMM开辟了一条新的途径。
Metal organic frameworks (MOFs) are ideal fillers for preparing mixed matrix membranes (MMMs) because of their molecular sieving property. However, MOF nanoparticles are not easy to be dispersed, which limits their application in MMMs with high MOFs loading. In this study, highly dispersed ZIF-8 nanoparticles with diameter of around 50 nm were prepared by coating isophthalic dihydrazide (IPD) molecular layer onto their surfaces via coordination interaction (abbre. IPD@ZIF-8). Benefiting from the highly stable and highly dispersed IPD@ZIF-8 solution, MMMs with high nanoparticles loading content and excellent uniformity are achieved. The modification of IPD on the surface of ZIF-8 nanoparticles greatly enhances the interfacial affinity between ZIF-8 as filler and 6FDA-Durene polyimide (PI) as polymer matrix under the interaction of strong hydrogen bond between them. Gas permeation results reveal that the H2 permeability of IPD@ZIF-8 mixed PI (PI/IPD@ZIF-8) MMM with 45 wt% loading content is up to 8000 Barrer and the corresponding ideal selectivities of H2/CH4 and H2/N2 gas pairs are 15.1 and 13.0, which increase by 46.6% and 32.7%, respectively, comparing to those of ZIF-8 mixed PI (PI/ZIF-8) MMMs. The comprehensive separation performance of PI/IPD@ZIF-8 MMMs surpasses the 2008 Robeson's upper bounds. The surface modification of IPD enhances the CO2 plasticization resistance property of PI/IPD@ZIF-8 MMMs from 21 bar to 30 bar. This study provides a facile and easy-operated strategy for the surface modification of MOF nanoparticles, and opens up a new way for the preparation of MMMs with high filler loading and good quality.