Department of Civil and Environmental Engineering, University of Waterloo, 200 University Ave., Waterloo, Ontario, Canada.
Water Res. 2009 Oct;43(18):4559-68. doi: 10.1016/j.watres.2009.08.008. Epub 2009 Aug 9.
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.
商业用聚偏氟乙烯（PVDF）平板膜经稀聚乙烯醇（PVA）水溶液表面涂覆，然后进行固-气界面交联得到改性。所得 PVA 层增加了膜的光滑度和亲水性，使改性膜和未改性膜的纯水透过率相当。采用 5mg/L 蛋白质溶液的污染测试表明，短时间的涂覆和交联可改善抗污染性能。在 18 小时的地表水（TOC 约为 7mg C/L）超滤过程中，改性膜的通量是未改性膜的两倍。改性膜改善的抗污染性与膜的物理化学性质有关，这通过纯水渗透、X 射线光电子能谱和接触角、ζ电位和粗糙度测量得到了证实。
