Positively charged hollow-fiber composite nanofiltration membrane prepared by quaternization crosslinking

Authors

  • Zhichao Zhang,

    1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300160, China
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  • Wei Wang

    Corresponding author
    1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300160, China
    • State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300160, China
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Abstract

Poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) can be crosslinked by interfacial polymerization to develop a positively charged dense network structure. According to this mechanism, a positively charged hollow-fiber composite nanofiltration (NF) membrane was prepared by quaternization to achieve a crosslinked PDMAEMA gel layer on the outer surface of polysulfone hollow-fiber ultrafiltration (UF) membranes with a PDMAEMA aqueous solution as a coating solution and p-xylylene dichloride as an agent. The preparation conditions, including the PDMAEMA concentration, content of additive in the coating solution, catalyzer, alkali, crosslinking temperature, and hollow-fiber substrate membrane, were studied. Fourier transform infrared spectroscopy and scanning electron microscopy were used to characterize the structure of the membranes. This membrane had a rejection to inorganic salts in aqueous solution. The rejection of MgSO4 (2 g/L aqueous solution at 0.7 MPa and 25°C) was above 98%, and the flux was about 19.5 L m−2 h−1. Moreover, the composite NF membranes showed good stability in the water-phase filtration process. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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