Issue 24, 2017, Issue in Progress

CO2 separation membranes with high permeability and CO2/N2 selectivity prepared by electrostatic self-assembly of polyethylenimine on reverse osmosis membranes

Abstract

CO2 separation membranes prepared by green, simple, and efficient methods have faced great challenges. In this work, a facilitated transport membrane with high CO2 permeance and CO2/N2 selectivity was prepared by an aqueous self-assembly method using commercially available polyethylenimine (PEI) and reverse osmosis (RO) membranes as the assembled molecule and substrate, respectively. When the PEI concentration was 50 mg L−1, the prepared membranes showed excellent permeability and selectivity. The effects of PEI concentration, pH of electrostatic-assembly and operating conditions on the membrane performance were systemically studied. The prepared membrane was also analyzed by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and contact angle measurements to determine the adsorption and assembly kinetics of PEI. For CO2, the facilitated transport mechanism was dominant because of the presence of amine groups from PEI molecules, while N2 transport was accomplished by a simple solution-diffusion mechanism.

Graphical abstract: CO2 separation membranes with high permeability and CO2/N2 selectivity prepared by electrostatic self-assembly of polyethylenimine on reverse osmosis membranes

Supplementary files

Article information

Article type
Paper
Submitted
04 Jan 2017
Accepted
27 Feb 2017
First published
06 Mar 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 14678-14687

CO2 separation membranes with high permeability and CO2/N2 selectivity prepared by electrostatic self-assembly of polyethylenimine on reverse osmosis membranes

J. Sun, Z. Yi, X. Zhao, Y. Zhou and C. Gao, RSC Adv., 2017, 7, 14678 DOI: 10.1039/C7RA00094D

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