期刊
GREEN CHEMICAL ENGINEERING
卷 2, 期 1, 页码 86-95出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.gce.2020.11.002
关键词
Mixed-matrix membrane; MOFs; Priming; Covalent grafting; Interfacial compatibility
资金
- National Natural Science Foundation of China [21776124]
- Jiangsu Provincial NSFC [BK20171459]
- Foundation of Jiangsu Educational Committee of China [17KJA530004]
- Jiangsu Province Key Laboratory of Fine Petrochemical Engineering
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Six Talent Peaks Project and Qing-Lan Engineering Project of Jiangsu Province
Covalent grafting of polyimide 6FDA-Durene onto UiO-66NH2 surface can mitigate filler aggregation and enhance interfacial interaction, leading to improved CO2/CH4 separation performance in mixed-matrix membranes. The gas transport mechanism suggests that the enhancement is mainly due to the increase in solubility selectivity.
Mixed-matrix membranes (MMMs) have received much attention due to their processable advantages of polymer and high permeability and/or selectivity of porous metal-organic frameworks (MOFs) fillers. However, the interfacial defects caused by poor interaction between MOFs with polymers and the agglomeration phenomenon caused by uneven dispersion of MOFs are common problems in mixed-matrix membranes. Currently, the priming protocol is one of solutions to the above problems, but it cannot precisely regulate the dispersion of particles and the interfacial compatibility between two phases. Herein, covalent grafting of polyimide 6FDA-Durene onto the surface of UiO-66NH2 can mitigate the aggregation of fillers inside the polymeric matrices and improve the interfacial interaction between two phases, thus significantly improving the CO2/CH4 separation performance on the as-synthesized MMMs. The explored gas transport mechanism indicated that the improved separation was due to the raise of solubility selectivity. Furthermore, the stronger covalent bond between fillers and polyimide than physical interaction of priming protocol also endows the improved anti-plasticization phenomenon for CO2/CH4 separation.
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