Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 300, Issue 1-2, Pages 71-78Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2007.05.008
Keywords
polyethersulfone membrane; ultrafiltration; poly(vinyl alcohol); adsorption-crosslinking; antifouling property
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An adsorption-crosslinking process of poly(vinyl alcohol) (PVA) was introduced to modify the surface of polyethersulfone (PES) ultrafiltration membranes for enhancement of their antifouling property. XPS and water contact angle measurement confirmed the obvious enhancement of Surface hydrophilicity. Ultrafiltration results showed that the spreading of PVA chains over the hydrophobic membrane surface caused substantial but acceptable decrease on membrane flux. The fouling type analysis indicated that PVA adsorption effectively improved the antifouling property of PES membranes. With a PVA concentration of 0.5 wt% and three cycles of alternative adsorption-crosslinking, the total and irreversible fouling ratio of modified membranes were 0.38 and 0.22, respectively, much lower than those of control PES membrane (0.61 and 0.47), and the flux recovery ratio was increased accordingly. The long-term ultrafiltration experiment demonstrated the improvement of recycling property and the reliability of adsorption-crosslinking process. (C) 2007 Elsevier B.V. All rights reserved.
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