MOFs/PEI混合基质膜的制备及CO<sub>2</sub>分离性能研究

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摘要二氧化碳的分离和捕获对可持续发展具有重要意义。聚醚酰亚胺(PEI)具有优异的耐溶剂、耐高温、选择性高等优势,然而CO₂渗透性能低成为限制其进一步发展的关键瓶颈。通过引入2种三维MOFs颗粒[UIO-66和MIL-101(Cr)]及2种二维MOFs纳米片[CuBDC和Zn₂(bim)₄]制备了4种MOFs/PEI混合基质膜(MMMs),对膜的物理化学性质及CO₂分离性能展开深入研究。结果表明MOFs的引入大幅提高了PEI膜的CO₂扩散系数及分离性能,并改善了PEI膜的抗CO₂塑化性能。同时,相比三维MOFs颗粒,二维CuBDC纳米片与PEI表现出更高的相容性,其填料含量为20%时MMMs的CO₂渗透通量相比纯PEI膜提高了3.5倍,其CO₂/CH₄选择性提高了2.2倍。以二维MOFs纳米片为功能性填料制备混合基质膜用于CO₂分离是一种有效的策略。

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	马英楠
	何兴艳
	唐少华
	刘娜
	曾乐林

关键词： CO₂分离膜分离混合基质膜二维MOFs纳米片

Abstract： The separation and capture of carbon dioxide is of great importance for sustainable development. Polyether imide (PEI) has the advantages of excellent solvent resistance, high temperature resistance and high selectivity, but the low permeability limits its further development. In this study, two kinds of three-dimensional MOFs particles [UIO-66 and MIL-101(Cr)] and two kinds of two-dimensional MOFs nanosheets [CuBDC and Zn₂(bim)₄] were introduced to prepare four kinds of MOFs/PEI mixed matrix membrane (MMMs). The physical and chemical properties of MMMs were studied, and the CO₂ separation performance was further compared. The results showed that the introduction of MOFs greatly improved the CO₂ diffusion coefficient and separation performance of PEI films, and improved the anti-CO₂ plasticization performance. Meanwhile, compared with three-dimensional MOFs particles, two-dimensional CuBDC nanosheets show better compatibility with PEI. When the filler content is 20%, the CO₂ permeability of MMMs is 3.5 times higher than that of pure PEI films, and the CO₂/CH₄ selectivity is 2.2 times higher than that of pure PEI films. It is an effective strategy to prepare MMMs with two-dimensional MOFs nanosheets fillers for CO₂ separation.

Keywords： CO₂ separation membrane separation mixed matrix membrane 2-D MOFs nanosheets

Received 2022-11-22;

Fund:湖南省教育厅创新平台开放基金(20K060);国家自然科学基金(22178092)。

About author: 马英楠(1992-),男,讲师,现从事分子分离膜、质子交换膜、新型膜材料等方面的研究。

引用本文:

马英楠, 何兴艳, 唐少华, 刘娜, 曾乐林.MOFs/PEI混合基质膜的制备及CO₂分离性能研究[J]. 化学工业与工程, 2023,40(3): 84-95

MA Yingnan, HE Xingyan, TANG Shaohua, LIU Na, ZENG Lelin.Preparation and CO₂ separation performance of MOFs/PEI mixed matrix membranes[J]. Chemcial Industry and Engineering, 2023,40(3): 84-95

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