Graphene oxide/cross-linked polyimide (GO/CLPI) composite membranes for organic solvent nanofiltration

•The compacted sponge-like structure was obtained via adjusting additive ratio.•The optimum cross-linker was screened to improve the stability.•High permeability was achieved via adjusting the coating conditions.•The LF-NMR technique was utilized to assess the affinity and stability. Purification an...

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Bibliographic Details
Published in:Chemical engineering research & design 2019-06, Vol.146, p.182-189
Main Authors: Liu, Mei-Ling, Wang, Jue, Guo, Jia-Lin, Lu, Tian-Dan, Cao, Xue-Li, Sun, Shi-Peng
Format: Article
Language:English
Subjects:
Chemical separation
Cross-linking
Crosslinking
Energy costs
Graphene
Graphene oxide
Low field nuclear magnetic resonance technology
Magnetic permeability
Membranes
Nanofiltration
NMR
Nuclear magnetic resonance
Organic chemistry
Organic solvent nanofiltration
Permeability
Polyimide
Porous materials
Solvents
Substrates
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Summary:•The compacted sponge-like structure was obtained via adjusting additive ratio.•The optimum cross-linker was screened to improve the stability.•High permeability was achieved via adjusting the coating conditions.•The LF-NMR technique was utilized to assess the affinity and stability. Purification and recovery of polar organic solvents such as dimethylformamide (DMF) with high chemical separation speed and low energy cost nanofiltration membranes has been widely investigated, while it is still a difficult challenge that high permeability of solvents and rejection of solutes are achieved simultaneously. In this study, a novel organic solvent nanofiltration (OSN) membranes was obtained via coating a thin selective graphene oxide (GO) layer on top of the polyimide porous substrate (PI) which was cross-linked to improve the stability in polar solvents. The resultant GO/cross-linked PI (GO/CLPI) composite membranes feature remarkable sieving capability of >94% for RBss molecules (1018 Da), accompanying high pure solvent permeability of 11.1 L h−1 m−2  bar−1, 4.9 L h−1 m−2  bar−1 and 1.0 L h−1 m−2  bar−1 for water, IPA and DMF, respectively. Different from conventional method of characterization, low field nuclear magnetic resonance technology (LF-NMR) was utilized to confirm that the GO/CLPI membrane shows a higher adsorption capacity for IPA than DMF. This newly technique can be effectively utilized to evaluate the affinity between organic solvents and the surface of membranes.
ISSN:0263-8762
1744-3563
DOI:10.1016/j.cherd.2019.03.041