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构建界面兼容的Por-POF/PIM-1混合基质膜用于CO2/N2高效分离

作者：王晓楠，倪飞，李海壮，沈舒欣，孙腾腾，王康军，于广莉

单位：沈阳化工大学化学工程学院，沈阳 110142

关键词：混合基质膜；Por-POF；界面相容性；CO2分离

DOI号： 10.16159/j.cnki.issn1007-8924.2024.04.019

分类号： TQ050.4+3

出版年,卷(期):页码： 2024,44(4):170-177

摘要：

混合基质膜（MMMs）在实现优异的CO2分离方面潜力很大，但其性能往往受到填料与基质之间界面兼容性差的限制。本研究将卟啉基多孔有机框架（Por-POF）分散在可溶性的固有微孔聚合物（PIM-1）中，制备了一系列高渗透选择性MMMs。Por-POF的纯有机属性增强其与纯有机聚合物基质的相互作用，从而制备界面相容性良好的膜材料。多孔的Por-POF可以增加膜的自由体积分数，提高了薄膜的渗透通量。此外，Por-POF孔壁上富集了大量氮，对CO2具有较强的吸附作用，从而提高CO2/N2选择性。气体渗透实验表明，与纯PIM-1膜相比，Por-POF/PIM-1膜的CO2渗透通量和CO2/N2选择性分别提高了157%和64%。本研究为合理设计和构建高性能的分离膜提供了一种独特的思路。

Mixed matrix membranes (MMMs) have great potential to achieve excellent CO2 separation, while their performances are often limited by poor interfacial compatibility between fillers and matrix. Here, a rational design and facile construction of highly permeable MMMs is presented by dispersing porphyrin based porous organic framework (Por-POF) within solution-processable polymer of intrinsic microporosity (PIM-1). The pure organic nature of Por-POF enhances its interaction with the pure organic polymer matrixes, leading to good interfacial compatibility in the resultant MMMs. Porous Por-POF fillers can increase the membrane fractional free volume that enhances the membrane gas permeability. Besides, Por-POF exhibits enriched nitrogen in its pore walls that has a strong adsorption effect on CO2, thus achieving higher CO2/N2 selectivity. Gas permeations demonstrate that CO2 permeability and CO2/N2 selectivity for Por-POF/PIM-1 increased by 157% and 64%, respectively, compared with pure PIM-1. This study will further bring unique insights for the rational design and construction of high performances separation membranes.

基金项目：

大学生创新创业训练项目（202210149011）；辽宁省博士启动基金项目（2022-BS-213）；国家自然科学基金项目（22208224）

作者简介：

王晓楠（2002-），女，辽宁大连人，本科生，主要研究方向为二氧化碳分离膜材料制备，E-mail：aurora_xiaonanwang@163.com

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