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Fabrication of Polyimide Membrane Incorporated with Functional Graphene Oxide for CO 2 Separation: The Effects of GO Surface Modification on Membrane Performance.
- Source :
-
Environmental science & technology [Environ Sci Technol] 2017 Jun 06; Vol. 51 (11), pp. 6202-6210. Date of Electronic Publication: 2017 May 17. - Publication Year :
- 2017
-
Abstract
- Two kinds of isocyanate were used to modify graphene oxide (GO) samples. Then, polyimide (PI) hybrid membranes containing GO and modified GO were prepared by in situ polymerization. The permeation of CO <subscript>2</subscript> and N <subscript>2</subscript> was studied using these novel membranes. The morphology experiments showed that the isocyanate groups were successfully grafted on the surface of GO by replacement of the oxygen-containing functional groups. After modification, the surface polarity of the GO increased, and more defect structures were introduced into the GO surface. This resulted in a good distribution of more modified GO samples in the PI polymer matrix. Thus, the PI hybrid membranes incorporated by modified GO samples showed a high gas permeability and ideal selectivity of membranes. In addition, enhancement of the selectivity due to the solubility of CO <subscript>2</subscript> played a major role in the increase in the separation performance of the hybrid membranes for CO <subscript>2</subscript> , although the diffusion coefficients for CO <subscript>2</subscript> also increased. Both the higher condensability and the strong affinity between CO <subscript>2</subscript> molecules and GO in the polymer matrix caused an enhancement of the solubility selectivity higher than the diffusion selectivity after GO surface modification.
- Subjects :
- Membranes, Artificial
Oxides
Polymerization
Polymers
Carbon Dioxide
Graphite
Subjects
Details
- Language :
- English
- ISSN :
- 1520-5851
- Volume :
- 51
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Environmental science & technology
- Publication Type :
- Academic Journal
- Accession number :
- 28488850
- Full Text :
- https://doi.org/10.1021/acs.est.7b01563