期刊
JOURNAL OF MEMBRANE SCIENCE
卷 663, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2022.121036
关键词
Metal-organic frameworks; Hierarchical porous membranes; Island-like structure; High permeance; Gas separation
资金
- Shandong Province Key Technology RD Program [2019TSLH0108]
- State Key Laboratory of Bio-Fibers and Eco-Textiles [ZDKT202008]
- Research Initiation Project of Qingdao University [DC2200000293]
In this study, hierarchical porous ZIF-8 membranes doped with Ag+ ions were successfully prepared, which possess a bi-continuous porous island-like structure and abundant metal sites. These membranes achieved synergistic improvement of gas separation performance in terms of permeance and selectivity, showing great potential for practical applications.
The development of polymer supported metal-organic frameworks (MOF) membranes with supernal gas permeance and good gas selectivity can satisfy the economic and technical requirements of membrane industry application that is still a huge challenge. This work, we prepared an hierarchical porous ZIF-8 (IZIF-8) membranes with Ag+ ion doped, in which isolated-mesopores connected by continuous-micropores, like island structure. On one hand, the membranes could shorten the diffusion path and reduce the diffusion barrier, which possessed higher gas permeance compared to the ZIF-8 membranes. During the crystallization of MOF membranes, the Ag+ ion was squeezed out because it could not coordinate with the ligand molecule, which etched the polycrystalline structure of MOF membranes due to the strong oxidation and corrosion in aqueous solution at the same time. Thus bi-continuous porous island-like structures in nanometers could be formed. On the other hand, the IZIF-8 membrane had abundant open metal sites contributing to the high gas selectivity due to the doping of Ag+ ions and Ag metal clusters. More importantly, the island-like structure could endow additional gas adsorption sites due to the introduction of dispersed defective-mesopores. Herein, the IZIF-8 membranes achieved the synergistic improvement of permeance and selectivity for gas separation by the special island-like structure. The obtained membranes displayed excellent N-2 permeance of 5158 GPU with favorable N-2/CH4 selectivity of 7.8 and outstanding CO2 permeance of 25820 GPU with acceptable CO2/CH4 selectivity of 35, which had good potential for application in the field of CH4 purification.
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