摘要
聚偏氟乙烯(PVDF)微孔膜由于其固有的疏水特性,在运行中常面临表面和孔隙易被污染的问题,本研究借助等离子体的活化作用,通过接枝反应将两性离子聚合物涂层引入膜表面,制备出了等离子体改性膜,并系统研究了改性膜的抗污染分离性能。结果表明,相比于原膜接触角为100°,水滴1 s内在改性膜的表面完全铺展开,亲水性得到了极大的提高;过滤牛血清蛋白(BSA)溶液时,通量衰减率由40.4%下降至5.1%,截留率由67.8%提高至98.7%。另外,进行油水分离实验时的稳定滤液通量由78.9 L/(m^(2)·h)上升为217.0 L/(m^(2)·h),且在10 d的连续运行中分离效率始终保持在99.9%以上,滤液中的油含量始终维持在50.0 mg/L以下。可见,采用等离子体辅助两性离子化改性,在不改变膜材料结构形态的同时,使其能够维持长期使用下稳定且优异的抗污染分离性能。
Polyvinylidene fluoride(PVDF)microporous membranes often experience surface and pore fouling during operation due to their inherent hydrophobicity.In this study,plasma activation was employed to introduce an amphiphilic polymer coating onto the membrane surface through grafting reactions,resulting in plasma-modified membranes.The anti-fouling separation performance of the modified membranes was systematically investigated.Results indicated that,compared with the original membrane’s contact angle of 100°,the water droplet spread out completely on the surface of the modified membrane within 1 s,demonstrating significantly enhanced hydrophilicity.During the filtration of bovine serum albumin(BSA)solution,the flux decay rate decreased from 40.4%to 5.1%,while the retention rate increased from 67.8%to 98.7%.Furthermore,in oil-water separation experiments,the stable filtrate flux increased from 78.9 L/(m^(2)·h)to 217.0 L/(m^(2)·h).Over 10 days of continuous operation,the separation efficiency remained consistently above 99.9%,with the oil content in the filtrate maintained below 50.0 mg/L.Evidently,plasma-assisted amphiphilic modification allows the membrane to maintain stable and superior anti-fouling separation performance during long-term use without altering its structural morphology.
作者
江浩喆
李茹
陈攀
李盼
JIANG Haozhe;LI Ru;CHEN Pan;LI Pan(School of Environmental and Chemical Engineering,Xi’an Engineering University,Xi’an 710600,China)
出处
《膜科学与技术》
北大核心
2025年第6期91-97,共7页
Membrane Science and Technology
