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MIL-101-OH纳米流体混基质膜的制备及其CO2分离性能

作者：王乐乐，赵丹，陈淑慧，刘慧强，孙健，徐徜徉，任吉中

单位： 1.洁净能源国家实验室，中国科学院大连化学物理研究所，大连 116023；2.中国科学院大学，北京 100049；3.膜技术国家工程研究中心，大连 116023

关键词：纳米流体；MIL-101-OH；混合基质膜；CO2分离

DOI号：

分类号： TQ051.893

出版年,卷(期):页码： 2024,44(4):36-47

摘要：

随着温室效应导致的全球变暖和海平面上升等环境问题日益严峻，碳捕集利用与封存（CCUS）就显得尤为重要。金属有机框架（MOF）混合基质膜（MMMs）因具有分离效果好、渗透性高的特点而广受关注，但仍存在和聚合物基质相容性差等问题，降低了其潜在的应用价值。本研究采用共价键连接的方式，以MIL-101-OH为主体，以偶联剂KH560为连接层，以聚醚胺M2070为冠状层制备出了MIL-101-OH无溶剂纳米流体（MIL-101-OH-M2070），并与Pebax1657制备混合基质膜，研究其CO2分离性能。结果表明，MIL-101-OH和聚醚胺M2070间共价键的连接方式既解决了MOF界面相容性差的问题，同时也提高了聚醚胺机械性能、热稳定性。此外，MIL-101-OH-M2070凭借MIL-101-OH的优良孔隙率和M2070的CO2亲和性，大幅提高了混合基质膜中CO2的扩散系数和溶解系数。相较于Pebax1657纯膜，MIL-101-OH-M2070 MMMs的CO2渗透系数可以达到Pebax1657纯膜的215%，且选择性基本不变。

Carbon Capture Utilization and Storage (CCUS) is crucial in addressing environmental issues such as global warming and sea level rise caused by the greenhouse effect. Metal-organic framework (MOF) mixed matrix membranes (MMMs) have gained significant attention due to their excellent separation efficiency and high permeability. However, there are problems with the compatibility of fillers and polymer matrices, which can lead to the formation of interfacial defects. This reduces their potential value for applications. The study involved the preparation of MIL-101-OH solvent-free nanofluid (MIL-101-OH-M2070) through covalent bonding. MIL-101-OH was used as the main body, coupling agent KH560 as the connecting layer, and poly(ether amine) M2070 as the coronal layer. Mixed matrix membranes were then prepared with Pebax1657 to investigate their CO2 separation performance. To address the issues of poor interfacial compatibility of MOF and weak mechanical and thermal stability of poly(ether amine), MIL-101-OH and poly(ether amine) M2070 were covalently bonded. MIL-101-OH nanofluidic hybrid matrix membranes (MIL-101-OH MMMs) were compared with MIL-101-OH-M2070-MMMs to solve the problem of poor interfacial compatibility. Furthermore, the hybrid matrix membrane containing MIL-101-OH-M2070 demonstrated a significant enhancement in both the diffusion and solubility coefficients of CO2. This improvement can be attributed to the exceptional porosity of MIL-101-OH and the CO2 affinity of M2070. When compared to the pure Pebax1657 membrane, the CO2 permeation coefficient of MIL-101-OH-M2070 MMMs was found to be 215% higher while maintaining the same selectivity.

基金项目：

国家自然科学基金项目（201908215）；大连市支持高层次人才创新创业项目（2019RQ062）；

作者简介：

王乐乐（1998-），男，安徽灵璧人，硕士研究生，主要从事膜分离研究，E-mail：wanglele@dicp.ac.cn

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