膜
纳滤
共聚物
高分子化学
聚氯乙烯
溶剂
化学工程
甲基丙烯酸甲酯
渗透
化学
材料科学
有机化学
聚合物
生物化学
工程类
作者
Yue Cui,Zhikan Yao,Ke Zheng,Shi-Yuan Du,Bao‐Ku Zhu,Liping Zhu,Chun‐Hui Du
标识
DOI:10.1016/j.memsci.2015.05.019
摘要
To explore low-pressure-driven nanofiltration (LPDNF) membranes with high permeate flux, a novel preparation route was proposed and investigated. First, an amphiphilic copolymer of poly (methyl methacrylate-co-dimethylaminoethyl methacrylate) (P(MMA-co-DMA)) was synthesized via free-radical copolymerization, and then blended with polyvinyl chloride (PVC) to fabricate precursor membranes via non-solvent induced phase separation (NIPS) process. Utilizing the quaternization and cross-linking reaction between p-xylylene dichloride (XDC) and tertiary amine units in PVC/PMMA-co-DMA precursor membranes, positively charged PVC/PMMA-co-DMA LPDNF membranes were obtained. Element alanalysis, X-ray photoelectron spectroscopy and scanning electron microscopy were employed to characterize the composition and morphology of the membranes. Effects of PMMA-co-DMA content and XDC concentration on the LPDNF membranes’ performance were studied and discussed. With the optimized condition, the NF membrane showed the highest salt rejection (R) and water flux (J), e.g., RMgCl2=89.1%, JMgCl2=22.1 L/(m2 h) and RNaCl=45.1%, JNaCl=27.6 L/(m2 h) at a pressure of 0.3 MPa. Besides, the rejections of the LPDNF membranes for inorganic salts increased in an order of Na2SO4
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