Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 576, Issue -, Pages 1-8Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2019.01.011
Keywords
Zeolite imidazolate framework membrane; Porous polymer substrate; Metal chelation; Polyaniline; Interface layer
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Funding
- National Natural Science Foundation of China [21576017, 21436002]
- National Ministry of Science and Technology of China [2015BAD15B07]
- Higher Education and High-Quality and World-Class Universities [PY201613]
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A facile and simple chelation assisted in-situ growth approach for the preparation of thin uniform metal organic framework composite membranes has been developed. Coherent zeolite imidazolate framework ZIF-7 and ZIF-67 layers were successfully grown on porous polypropylene substrate covered with metal-chelating polyaniline interface layer. These membranes exhibited a H-2 permeance of 1.6 x 10(-7) mol m(-2) s(-1) Pa-1 and an ideal H-2/CO2 separation factor of 7.9. The incorporation of the second organic linker 2-aminobenzimidazole in the ZIF-7 framework afforded ZIF-7-NH2 layer enabling gate-opening and flexibility. This new hybrid ZIF-7-NH2 membrane featured a significantly increased H-2 permeance of 4.9 x 10(-6) mol m(-2) s(-1) Pa-1 and an ideal H-2/CO2 separation factor of 10.6.
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