温敏性抗污染纳滤膜的制备及性能表征

Preparation and Property Characterization of Thermo-Responsive and Anti-Fouling Nanofiltration Membrane

膜污染是制约纳滤膜发展应用的关键问题之一,表面改性是提高纳滤膜抗污染性能的有效途径。利用溶液浸涂工艺,将具有合适低临界温度(LCST)值和亲水性的温敏性聚N-异丙基丙烯酰胺(PNIPAm)类功能材料涂覆于聚酰胺纳滤膜表面对其进行修饰,制备出一种温敏性抗污染纳滤膜。测试结果表明,改性后的纳滤膜抗污染性能明显提高,死端过滤试验持续运行32h,通量衰减率只有8.7%,通量恢复率可达98.4%。

Membrane fouling is one of the critical problems that restricts the development and application of nanofiltration （NF） membranes. Surface modification has been proved to be an effective strategy to enhance anti-fouling properties of NF membranes. Herein, a kind of thermo-responsive polymers of PNIPAm with low critical solution temperature（LCST） is coated on the surface of commercial NF membranes via method of dip-coating. By this strategy, NF membranes with thermo-responsibility and excellent an- ti-fouling properties are successfully fabricated. The testing result indicates that thus prepared NF membranes distinctly improve anti- fouling performance. In the testing period of 32 h by dead-end fihration, decline rate of thus prepared NF membranes is only 8.7 %, while the flux recovery rate is as high as 98.4%.