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In-situ growth of highly permeable zeolite imidazolate framework membranes on porous polymer substrate using metal chelated polyaniline as interface layer

Author:
Ma, Liang, Svec, Frantisek, Tan, Tianwei, Lv, Yongqin
Source:
Journal of membrane science 2019 v.576 pp. 1-8
ISSN:
0376-7388
Subject:
asymmetric membranes, carbon dioxide, chelation, coordination polymers, hydrogen, polypropylenes, zeolites
Abstract:
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 H2 permeance of 1.6 × 10−7 mol m−2 s−1 Pa−1 and an ideal H2/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 H2 permeance of 4.9 × 10−6 mol m−2 s−1 Pa−1 and an ideal H2/CO2 separation factor of 10.6.
Agid:
6291546