膜
超滤(肾)
接触角
化学工程
结垢
甲基丙烯酸
单体
嫁接
甲基丙烯酸酯
生物污染
腐植酸
材料科学
纳滤
膜污染
高分子化学
色谱法
化学
聚合物
有机化学
生物化学
工程类
肥料
作者
Weigui Fu,Guoxia Li,Gaowei Zhai,Yunji Xie,Meixiu Sun,Hatice Mutlu,Yiping Zhao,Li Chen
出处
期刊:Membranes
[MDPI AG]
日期:2021-09-30
卷期号:11 (10): 761-761
被引量:3
标识
DOI:10.3390/membranes11100761
摘要
In this work, a facile preparation method was proposed to reduce natural organics fouling of hydrophobic membrane via UV grafting polymerization with methacrylic acid (MAAc) and methyl acrylamide (MAAm) as hydrophilic monomers, followed by multihydrogen bond self-assembly. The resulting poly(vinylidene fluoride)-membranes were characterized with respect to monomer ratio, chemical structure and morphology, surface potential, and water contact angle, as well as water flux and organic foulants ultrafiltration property. The results indicated that the optimal membrane modified with a poly(MAAc-co-MAAm) polymer gel layer derived from a 1:1 monomer ratio exhibited superior hydrophilicity and excellent gel layer stability, even after ultrasonic treatment or soaking in acid or alkaline aqueous solution. The initial water contact angle of modified membranes was only 36.6° ± 2.9, and dropped to 0° within 13 s. Moreover, flux recovery rates (FRR) of modified membranes tested by bovine serum albumin (BSA), humic acid (HA), and sodium alginate (SA) solution, respectively, were all above 90% after one-cycle filtration (2 h), significantly higher than that of the pure membrane (70-76%). The total fouling rates (Rt) of the pure membrane for three foulants were as high as 47.8-56.2%, while the Rt values for modified membranes were less than 30.8%. Where Rt of BSA dynamic filtration was merely 10.7%. The membrane designed through grafting a thin-layer hydrophilic hydrogel possessed a robust antifouling property and stability, which offers new insights for applications in pure water treatment or protein purification.
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