Issue 30, 2015

Oriented two-dimensional zeolitic imidazolate framework-L membranes and their gas permeation properties

Abstract

A two-dimensional zeolitic imidazolate framework (ZIF), ZIF-L, with a unique anisotropic pore system makes it an excellent material for investigating ZIF membranes with crystallographically preferred orientation and their effects on gas separation properties. A b-oriented ZIF-L membrane was successfully prepared from a randomly oriented seed layer. In contrast, a c-oriented ZIF-L crystal layer was attached to a support through vacuum filtration in the presence of polyethyleneimine. After a short-time secondary growth, the oriented layer grew into a continuous membrane with a high degree of c-out-of-plane orientation. Gas separation studies demonstrated the orientation-dependent separation behavior. In single gas permeation experiments, the c-oriented ZIF-L membrane has higher ideal selectivities of 8.1 for H2/N2 and 24.3 for H2/CO2 compared to the corresponding values of 3.9 and 5.5 for the b-oriented ZIF-L membrane. The results of binary gas permeation showed decreased separation factors of the c-oriented membrane, but were still much higher than those of the b-oriented membrane. This work provides new insights into controlling ZIF membrane orientation for achieving desirable gas separation performance.

Graphical abstract: Oriented two-dimensional zeolitic imidazolate framework-L membranes and their gas permeation properties

Supplementary files

Article information

Article type
Paper
Submitted
21 May 2015
Accepted
23 Jun 2015
First published
23 Jun 2015

J. Mater. Chem. A, 2015,3, 15715-15722

Author version available

Oriented two-dimensional zeolitic imidazolate framework-L membranes and their gas permeation properties

Z. Zhong, J. Yao, R. Chen, Z. Low, M. He, J. Z. Liu and H. Wang, J. Mater. Chem. A, 2015, 3, 15715 DOI: 10.1039/C5TA03707G

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