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Preparation of ZIF-93/Pebax 2533 mixed matrix membrane for CO2/N2 separation

Authors： XIE Yafang, JIN Hua, LI Yanshuo

Units： School of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, P.R. China

KeyWords： ZIF-93/Pebax mixed matrix membrane; asymmetric structure; CO2/N2 separation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(5):79-86

Abstract：

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.

Funds：

国家自然科学基金青年科学基金（21808113）

AuthorIntro：

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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