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Issue 69, 2016
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Facilitated transport membranes by incorporating different divalent metal ions as CO2 carriers

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Abstract

Facilitated transport membranes by utilizing π complexation reactions between metal ions and penetrants have been actively explored, however, the different facilitated transport abilities of metal ions remains to be disclosed. In this study, poly(N-vinylimidazole) coated carbon nanotube particles (PVI@CNT) were prepared via precipitation polymerization of N-vinylimidazole monomers on a CNT surface. The PVI@CNT particles were then loaded with four kinds of divalent metal ions, Cu2+, Fe2+, Ca2+ and Mg2+, and incorporated into polyimide (PI) to prepare M2+–PVI@CNT hybrid membranes. The structure of M2+–PVI@CNT particles and PI–M2+–PVI@CNT membranes was analyzed by different characterization tools. Taking CO2/CH4 as the model separation system, the hybrid membranes containing Cu2+ and Fe2+ at filler content of 7 wt% showed the maximum increase of CO2 permeability of 89% and 87% compared with those of a pristine PI membrane. Meanwhile, the selectivity of these membranes shows little increase. However, membranes containing Ca2+ and Mg2+ show only little enhancement in the separation properties. Such results can be interpreted based on the π complexation mechanism, transition metal ions Cu2+ and Fe2+ possess a strong CO2 facilitated transport ability whereas main-group metal ions Ca2+ and Mg2+ possess a weak facilitated transport ability. Finally, a correlation of the electronegativity of metal ions with their CO2 facilitated transport abilities was explored.

Graphical abstract: Facilitated transport membranes by incorporating different divalent metal ions as CO2 carriers

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Article information


Submitted
15 Apr 2016
Accepted
27 Jun 2016
First published
29 Jun 2016

RSC Adv., 2016,6, 65282-65290
Article type
Paper

Facilitated transport membranes by incorporating different divalent metal ions as CO2 carriers

D. Peng, Y. Liu, S. Wang, Z. Tian, Q. Xin, H. Wu, J. Chen and Z. Jiang, RSC Adv., 2016, 6, 65282
DOI: 10.1039/C6RA09782K

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