Hyperbranched Polyethyleneimine Induced Cross-Linking of Polyamide鈭抜mide Nanofiltration Hollow Fiber Membranes for Effective Removal of Ciprofloxacin

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• 作者：Shi Peng Sun ; T. Alan Hatton ; Tai-Shung Chung
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：May 1, 2011
• 年：2011
• 卷：45
• 期：9
• 页码：4003-4009
• 全文大小：867K
• 年卷期：v.45,no.9(May 1, 2011)
• ISSN：1520-5851

文摘

This study aims to develop a positively charged nanofiltration (NF) hollow fiber membrane for effective removal of ciprofloxacin from water. A novel NF membrane was fabricated by hyperbranched polyethyleneimine (PEI) induced cross-linking on a polyamide鈭抜mide hollow fiber support. The spongy-like, fully porous membrane support provides minimal transport resistance and sufficient mechanical strengths for water permeation under high pressures. It is found that the PEI modification significantly influences NF performance through the mechanisms of size exclusion, charge repulsion, and solute鈭抦embrane affinity. Specifically, after PEI induced cross-linking, the membrane pore size is significantly reduced. The membrane surface becomes more hydrophilic and positively charged. As a result of these synergic effects, the rejection of ciprofloxacin is substantially enhanced. Furthermore, experimental results show that the molecular weight of PEI has tremendous effect on NF performance of the as-modified membrane. The NF membrane modified by a high molecular weight PEI_60K exhibits the highest rejection, the lowest fouling tendency, and keeps a constant flux over the whole pH range. This study may have great potential for developing high-performance antifouling NF hollow fiber membranes for various industrial applications.