Enhancing the antifouling property of polyethersulfone ultrafiltration membranes through surface adsorption-crosslinking of poly(vinyl alcohol)
- 作者：Xiaole Ma ; Yanlei Su ; Qiang Sun ; Yanqiang Wang ; Zhongyi Jiang
- 关键词：Polyethersulfone membrane ; Ultrafiltration ; Poly(vinyl alcohol) ; Adsorption-crosslinking ; Antifouling property
- 刊名：Journal of Membrane Science
- 出版年：2007
- 期刊代码：55_03767388
- 类别：ch
- 出版时间：15 August 2007
- 卷：300
- 期：1-2
- 页码：71-78
- 文件大小：868 K
摘要
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.