摘要
通过活性自由基聚合用羧酸甜菜碱丙烯酸甲酯(CBMA)和苯乙烯(St)制备了一种含有两性离子的聚合物P(St_(x)-co-CBMA_(y)),并将其作为添加剂,采用非溶液致相分离(NIPS)法制备了改性聚偏氟乙烯(PVDF)膜,并对膜性能进行测试研究.通过ATR-FTIR及XPS分析可知,改性膜表面出现两性离子聚合物的富集.两性离子的加入对膜的微观结构有明显影响,改性膜的孔隙率及膜厚明显增加.两性离子聚合物的加入改变了膜表面电荷分布,膜的等电点升高,对膜的抗污染性能具有一定的影响.改性膜在静态吸附条件下(pH=5.3)对1.0 g/L牛血清蛋白(BSA)和溶菌酶(LYZ)的吸附量明显降低,具有优异的抗污染性能.用改性膜对BSA和海藻酸钠(SA)进行动态过滤,结果表明,改性膜M-P1对BSA及SA的污染大部分为可逆污染,膜具有较高的通量恢复率.
A zwitterion polymer P(St_(x)-co-CBMA_(y))was obtained from carboxylic betaine methyl acrylate(CBMA)and styrene(St)by reactive radical polymerization.The modified PVDF membranes were prepared by non-solvent induced phase sepatation(NIPS)with addition of polymer and the properties of the membrane were tested and studied.By anylasis of ATR-FTIR and XPS,the zwitterion polymers were enriched on the surface of the modified membrane which obviously affected membrane microstructure.The porosity and thickness of the modified membrane increased obviously.The membrane surface charge distribution was changed and the isoelectric point increased due to the addition of zwitterion polymer,which had a certain effect on the anti-fouling performance of the membrane.Under the condition of static adsorption,the adsorption capacities of 1.0 g/L BSA and LYZ solution at pH=5.3 by modified membrane were significantly reduced showing excellent anti-fouling performance.Dynamic filtration experiments of BSA and SA showed that most of the pollution of modified membranes M-P1 to BSA and SA was reversible,and the flux recovery rate of the modified membranes maintained a high level.
作者
周晓吉
孙一卓
刘天澍
程莹
白仁碧
ZHOU Xiaoji;SUN Yizhuo;LIU Tianshu;CHENG Ying;BAI Renbi(Center for Separation and Purification Materials and Technologies,School of Environment and Science and Engineering,Suzhou Unuversity of Science and Technology,Suzhou 215009,China;Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment?Suzhou University of Science and Technologyy,Suzhou 215009,China)
出处
《膜科学与技术》
CAS
CSCD
北大核心
2021年第4期84-92,共9页
Membrane Science and Technology
基金
江苏水处理技术与材料协同创新中心预研项目(XTCXSZ2019-4)
苏州分离净化材料与技术重点实验室项目(SZS201512)。
关键词
两性离子聚合物
改性PVDF膜
抗污染性
zwitterionic copolymers
modified PVDF membranes
anti-fouling performance
