纳米壳聚糖改性PVDF微滤膜抗污染性能的研究  

Studies on anti-fouling performance of Polyvinylidene Fluoride (PVDF) microfiltration membrane modified by nano-chitosan

作　　者：贾倩[1] 相波[1] 李义久[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《膜科学与技术》2012年第5期63-67,共5页Membrane Science and Technology

基　　金：上海市科委国际科技合作基金项目(09230713300)

摘　　要：研究了纳米壳聚糖改性聚偏氟乙烯(PVDF)微滤膜的制备方法及其抗污染性能.借助傅立叶-红外光谱仪(FTIR)、扫描电子显微镜(SEM)、静滴接触角测量仪等分析手段对改性后的PVDF膜进行了表征.FTIR研究结果证明,与未改性膜相比,改性膜表面有纳米壳聚糖的存在.SEM研究结果发现,孔径随纳米壳聚糖量的增加逐渐减小,而孔的数量先增加后减少.接触角和纯水通量都随纳米壳聚糖量的增加先减小后增大.在蛋白质抗污染实验中,选用牛血清蛋白(BSA)制备蛋白质溶液.改性膜具有更高的水通量恢复率,并且显正电荷性质的BSA和纳米壳聚糖之间的静电排斥力使其具有很高的截留率.所以改性膜具有很好的抗污染性能.This paper studied the preparation and performance of the poly （vinylidene fluoride） （PVDF） microfiltration membrane modified by nano-chitosan. The modified membrane was characterized by Fourier transform infrared spectroscopy （FTIR）. scanning electron microscopy （SEM） and contact angle measurement apparatus. Compared to unmodified membranes the results of FTIR study of modified membranes confirmed that there was nano-chitosan on the membrane surfaces. And the results of SEM study of modified membranes indicated that, as the nano-chitosan content increase the pore radius decrease, and the number of pores increase firstly and then decreased. With increasing chitosan Content, The water contact angles and water flux increase firstly and then decreased. In protein fouling experiment, bovine serum albumin （BSA） was used as a protein model. For the Electrostatic repulsion force between the positive molecules of the BSA and nano-chitosan, the modified membranes have higher water flux recovery and higher solute rejection exhibited higher and how better anti-fouling properties than unmodified membrane.

关 键 词：纳米壳聚糖 PVDF 抗污染 亲水性 

分 类 号：TQ028.8[化学工程]