Modification of poly(vinylidene fluoride) ultrafiltration membranes with poly(vinyl alcohol) for fouling control in drinking water treatment |
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| Authors: | Jennifer R Du Sigrid Peldszus Peter M Huck Xianshe Feng |
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| Affiliation: | aDepartment of Civil and Environmental Engineering, University of Waterloo, 200 University Ave, Waterloo, Ontario N2L 3G1, Canada;bDepartment of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada |
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| Abstract: | A commercial poly(vinylidene fluoride) flat sheet membrane was modified by surface coating with a dilute poly(vinyl alcohol) (PVA) aqueous solution followed by solid-vapor interfacial crosslinking. The resulting PVA layer increased membrane smoothness and hydrophilicity and resulted in comparable pure water permeation between the modified and unmodified membranes. Fouling tests using a 5 mg/L protein solution showed that a short period of coating and crosslinking improved the anti-fouling performance. After 18 h ultrafiltration of a surface water with a TOC of approximately 7 mg C/L, the flux of the modified membrane was twice as high as that of the unmodified membrane. The improved fouling resistance of the modified membrane was related to the membrane physiochemical properties, which were confirmed by pure water permeation, X-ray photoelectron spectroscopy, and contact angle, zeta potential and roughness measurements. |
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| Keywords: | Surface modification Fouling control Interfacial crosslinking Hydrophilicity Roughness |
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