Issue 17, 2018

Preparation of a pure ZIF-67 membrane by self-conversion of cobalt carbonate hydroxide nanowires for H2 separation

Abstract

The fabrication of integrated pure Co-based ZIF membranes on porous tubular substrates is extremely challenging. This work demonstrates the preparation of a continuous pure ZIF-67 tubular membrane by direct transformation of carbonate hydroxide nanowire arrays (Co-NWAs) in a 2-methylimidazole (Hmim) aqueous solution. This strategy included first growth of Co-NWAs on a porous ceramic tube and then self-conversion of the Co-NWAs to a continuous ZIF-67 membrane in the Hmim aqueous solution. The effects of the synthesis parameters (solvent, temperature and concentration) on the formation of the pure ZIF-67 membrane were investigated in detail. It was found that the balance between the dissolution rate of the Co-NWAs and the coordination rate of Co2+ produced with Hmim is significant in the transformation process. The obtained ZIF-67 membrane with 1.7 μm thickness exhibits a high H2 permeance of 5.59 × 10−7 mol m−2 s−1 Pa−1, and the ideal separation factors for H2/N2 and H2/CH4 are 14.7 and 15.3, respectively. Moreover, the ZIF-67 membrane demonstrates excellent stability since the Co-NWAs act as strong linkers between the membrane and the substrate. This self-conversion strategy can also be extended to the synthesis of other Co-based MOF membranes.

Graphical abstract: Preparation of a pure ZIF-67 membrane by self-conversion of cobalt carbonate hydroxide nanowires for H2 separation

Supplementary files

Article information

Article type
Paper
Submitted
12 Feb 2018
Accepted
21 Mar 2018
First published
21 Mar 2018

CrystEngComm, 2018,20, 2440-2448

Preparation of a pure ZIF-67 membrane by self-conversion of cobalt carbonate hydroxide nanowires for H2 separation

P. Nian, Y. Cao, Y. Li, X. Zhang, Y. Wang, H. Liu and X. Zhang, CrystEngComm, 2018, 20, 2440 DOI: 10.1039/C8CE00238J

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