改性PVDF中空纤维膜抗污染性能研究

Study on anti-fouling property of modified PVDF hollow fiber membrane

通过高能电子束辐照接枝丙烯酸制备了亲水改性PVDF中空纤维膜,根据纯水通量和对牛血清白蛋白溶液、腐植酸溶液、酵母菌溶液的渗透性能研究PVDF膜表面亲水改性对抗污染的影响.结果表明:辐照接枝改性使PVDF中空纤维膜的纯水通量提高了1倍;改性膜对腐植酸溶液和酵母菌溶液的渗透通量下降率较原膜分别降低58%和37%;碱性条件下,改性膜对牛血清白蛋白溶液的渗透通量下降率较原膜降低35%.

Hydrophilic modified PVDF hollow fiber membrane is prepared by grafting acrylic acid （AA） onto its surface by high energy electron beam. The pure water flux and permeation of bovine serum albumin （BSA） solution, humic acid （HA） solution, and saccharomycetes solution are considered to be the main parameters that to measure the anti-fouling property of modified PVDF membrane. The results indicate that the pure water flux of PVDF membrane improved nearly l times by hydrophilic modification. Compared to original PVDF membrane, the reduction rates of permeation flux of modified PVDF membrane for HA solution and saccharomycetes solution decrease 58% and 37%, respectively. The reduction rate of permeation flux of modified PVDF membrane for BSA solution decreases 35% compared with the original membrane in alkaline condition.