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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of a novel positively charged nanofiltration membrane based on polysulfone
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Preparation and characterization of a novel positively charged nanofiltration membrane based on polysulfone

机译：基于聚砜的新型带正电纳滤膜的制备与表征

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The goal of this study was to prepare positively charged nanofiltration (NF) membranes to remove cations from aqueous solutions. A composite NF membrane was fabricated by the modification of a polysulfone ultrafiltration support. The active top layer was formed by the interfacial crosslinking polymerization of poly(ethylene imine) (PEI) with p-xylene dichloride (XDC). Then, it was quaternized by methyl iodide (MI) to form a perpetually positively charged layer. The chemical and morphological changes of the membrane surfaces were studied by Fourier transform infrared spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy. To optimize the membrane operation, the PEI solution concentration, PEI coating time, XDC concentration, crosslinking time, and MI concentration were optimized. Consequently, high water flux (5.4 L m(-2) h(-1) bar(-1)) and CaCl2 rejection (94%) values were obtained for the composite membranes at 4 bars and 30 degrees C. The rejections of the NF membrane for different salt solutions, obtained from pH testing, followed the order Na2SO4
机译：这项研究的目的是制备带正电的纳滤（NF）膜，以去除水溶液中的阳离子。通过改性聚砜超滤载体制备复合NF膜。通过聚（亚乙基亚胺）（PEI）与对二甲苯二氯化物（XDC）的界面交联聚合形成活性顶层。然后，将其用碘甲烷（MI）季铵化以形成永久带正电的层。膜表面的化学和形态变化通过傅立叶变换红外光谱，扫描电子显微镜（SEM）和原子力显微镜研究。为了优化膜操作，对PEI溶液浓度，PEI涂布时间，XDC浓度，交联时间和MI浓度进行了优化。因此，在4 bar和30摄氏度下，复合膜获得了高水通量（5.4 L m（-2）h（-1）bar（-1））和CaCl2截留率（94％）值。通过pH测试获得的用于不同盐溶液的NF膜，顺序为Na2SO4

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