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In-situ growing ZIF-8 on cellulose nanofibers to form gas separation membrane for CO2 separation
- Jia, Mingmin, Zhang, Xiong-Fei, Feng, Yi, Zhou, Yichen, Yao, Jianfeng
- Journal of membrane science 2019
- asymmetric membranes, carbon dioxide, cellulose, cellulose nanofibers, crystals, electrostatic interactions, filtration, methane, permeability, zinc
- ZIF-8@cellulose nanofiber (ZIF-8@CNF) composite membranes were prepared via in-situ growing ZIF-8 crystals on cellulose nanofibers (CNFs) and vacuum filtration. Owning to the electrostatic forces between –COO- of CNFs and Zn2+ of ZIF-8, ZIF-8 crystals were anchored homogenously on CNFs. With ZIF-8 loading increased to sufficiently high, the intrinsic selectivity of ZIF-8 played an important role for gas separation. As a result, the optimum separation performance is achieved over ZIF-8@CNF-70 composite membrane with CO2 permeability of 550 Barrer and CO2/N2 and CO2/CH4 ideal selectivity of 45.5 and 36.2, respectively.