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ZIF-93/Pebax 2533混合基质膜的制备及其CO2/N2分离性能研究

作者：谢亚芳，金花，李砚硕

单位：宁波大学材料科学与化学工程学院，宁波?315211

关键词： ZIF-93/Pebax 2533混合基质膜；非对称结构；CO2/N2分离

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(5):79-86

摘要：

燃烧后CO2捕获技术的发展对降低温室效应至关重要。CO2选择性多孔骨架与高分子材料的结合有望开发高性能混合基质膜，用于CO2/N2混合气分离。本工作考察了孔径在CO2和N2动力学直径之间的两种沸石咪唑酯骨架（Zeolitic imidazole frameworks, ZIFs）材料，即ZIF-8和ZIF-93的吸附特性，结果表明ZIF-93由于骨架中醛基的存在具有CO2优先吸附性能，其等摩尔CO2/N2理论吸附选择性为25，远高于ZIF-8（6.5）。通过旋涂法在PVDF载体上制备了具有非对称结构的ZIF-93/Pebax 2533混合基质膜。其中，ZIF-93负载量为12%时，ZIF-93/Pebax混合基质膜展示出最优的CO2/N2混合气分离性能，CO2渗透率为47 GPU，CO2/N2选择性为42。随着原料气中CO2的分压增大，ZIF-93/Pebax混合基质膜的CO2/N2选择性基本不变，实现了高压下CO2的高效分离。

The development of post-combustion CO2 capture technology is essential to reduce the greenhouse effect. The combination of CO2 selective porous framework and polymer materials is expected to develop high-performance mixed matrix membranes for mixed-gas CO2/N2 separation. This work investigated the adsorption characteristics of two zeolitic imidazole frameworks (ZIFs) materials, namely ZIF-8 and ZIF-90 with pore diameters between the kinetic diameters of CO2 and N2 molecules. The results show that ZIF-93 has preferential adsorption of CO2 due to the presence of aldehyde groups in the framework. The theoretical adsorption selectivity of equimolar CO2/N2 mixture is 25, which is much higher than that of ZIF-8 (6.5). The ZIF-93/Pebax 2533 mixed matrix membrane was then prepared on the PVDF substrate by spin coating. When the ZIF-93 loading is 12%, the ZIF-93/Pebax mixed matrix membrane shows the best CO2/N2 mixed-gas separation performance, with CO2 permeance of 47 GPU and CO2/N2 selectivity of 42. As the partial pressure of CO2 in the feed gas increases, the ZIF-93/Pebax mixed matrix membrane exhibits basically unchanged CO2/N2 selectivity, realizing the efficient separation of CO2 under high pressure.

基金项目：

国家自然科学基金青年科学基金（21808113）

作者简介：

谢亚芳（1995-），女，山东省菏泽市，硕士研究生，硕士，研究方向：混合基质膜合成，E-mail：yafangxie24@163.com

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