吸附
膜
渗透
离子液体
甲烷
化学工程
选择性
气体分离
材料科学
金属有机骨架
基质(化学分析)
离子强度
化学
复合材料
有机化学
催化作用
吸附
水溶液
生物化学
工程类
作者
Paloma Ortiz–Albo,Tiago J. Ferreira,Carla F. Martins,Vítor D. Alves,Isabel A. A. C. Esteves,Luı́s Cunha-Silva,Izumi Kumakiri,João G. Crespo,Luísa A. Neves
出处
期刊:Membranes
[MDPI AG]
日期:2021-12-23
卷期号:12 (1): 13-13
被引量:11
标识
DOI:10.3390/membranes12010013
摘要
Carbon dioxide (CO2) capture has become of great importance for industrial processes due to the adverse environmental effects of gas emissions. Mixed matrix membranes (MMMs) have been studied as an alternative to traditional technologies, especially due to their potential to overcome the practical limitations of conventional polymeric and inorganic membranes. In this work, the effect of using different ionic liquids (ILs) with the stable metal–organic framework (MOF) ZIF-8 was evaluated. Several IL@ZIF-8 composites and IL@ZIF-8 MMMs were prepared to improve the selective CO2 sorption and permeation over other gases such as methane (CH4) and nitrogen (N2). Different ILs and two distinct loadings were prepared to study not only the effect of IL concentration, but also the impact of the IL structure and affinity towards a specific gas mixture separation. Single gas sorption studies showed an improvement in CO2/CH4 and CO2/N2 selectivities, compared with the ones for the pristine ZIF-8, increasing with IL loading. In addition, the prepared IL@ZIF-8 MMMs showed improved CO2 selective behavior and mechanical strength with respect to ZIF-8 MMMs, with a strong dependence on the intrinsic IL CO2 selectivity. Therefore, the selection of high affinity ILs can lead to the improvement of CO2 selective separation for IL@ZIF-8 MMMs.
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