纳滤
膜
化学工程
聚电解质
壳聚糖
丙烯酸
水溶液
化学
微型多孔材料
阳离子聚合
热稳定性
逐层
氯化物
图层(电子)
高分子化学
色谱法
材料科学
有机化学
聚合物
共聚物
工程类
生物化学
作者
Yifeng Huang,Jingjing Sun,Dihua Wu,Xianshe Feng
标识
DOI:10.1016/j.seppur.2018.06.032
摘要
Polyelectrolyte composite nanofiltration membranes were prepared using layer-by-layer self-assembly of chitosan and poly(acrylic acid) on a microporous polyethersulfone substrate. Membranes with a layer-by-layer structure were formed by sequential depositions of cationic chitosan and anionic poly(acrylic acid) alternately. The impacts of parameters involved in the membrane preparation process on the separation performance of the resulting membrane were investigated. The membranes showed good separation performance with an over 90% rejections to sulfate salts (i.e., MgSO4 and Na2SO4) and nearly 60% rejections to chloride salts (i.e., MgCl2 and NaCl). In spite of commonly observed trade-off relationship between salt rejection and water permeability, the membrane fabrication conditions can be tailored to enhance the overall performance of the nanofiltration membranes. The LbL self-assembled membranes may not afford a long-term use for nanofiltration of aqueous solutions due to extensive membrane swelling over a prolonged period of operation, and thermal and chemical post-treatments (i.e., heat treatment and chemical crosslinking) can be used to improve the membrane stability.
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