Cite this article: Chong, K.C., Lai, S.O., Lau, W.J., Thiam, H.S., Ismail, A.F. and Zulhairun, A.K. (2017). Fabrication and Characterization of Polysulfone Membranes Coated with Polydimethysiloxane for Oxygen Enrichment.
Aerosol Air Qual. Res.
17: 2735-2742. https://doi.org/10.4209/aaqr.2016.12.0571
HIGHLIGHTS
Polysulfone (PSF) membranes were fabricated with different bore fluid flow rates.
PSF membranes were coated with different concentrations of polydimethysiloxane.
Effects of bore fluid flow rate on separation properties were studied.
PSF membranes coated with PDMS showed improved performance.
The best performing membrane showed permeance of 73.12 GPU and selectivity of 4.56.
ABSTRACT
This paper presented the application of polymeric membranes for oxygen/nitrogen (O2/N2) gas separation. Polysulfone (PSF) hollow fiber membranes were fabricated by phase inversion process using N,N-dimethylacetamide (DMAc) and tetrahydrofuran (THF) as co-solvent and ethanol as additive. The effects of bore fluid flow rate and polydimethysiloxane (PDMS) coating concentration on the separation characteristics of hollow fiber membranes were studied. Prior to gas permeation study, characterizations were performed to study the membrane morphology, its thickness and quality of PDMS coating layer on the membrane surface. It was found that the bore fluid flow rate played an important role for the O2/N2 separation as it could alter the membrane structure and dimension. The membrane fabricated with lower bore fluid flowrate exhibited better gas permeance and selectivity, owing to better structural integrity that favored the PDMS coating. The results indicated that the PSF hollow fiber membrane coated with optimum PDMS concentration could show greater O2/N2 gas permeability and selectivity relative to the PSF membrane without PDMS coating.
Keywords: Oxygen; Polysulfone; Nitrogen; Gas separation; Polydimethysiloxane; Hollow fiber membrane
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