Preparation and Characterization of a Novel Polyamide Charged Mosaic Membrane

Abstract

Abstract: A novel composite charged mosaic membrane (CCMM) was prepared via interfacial polymerization (IP) of polyamine[poly (epichlorohydrin amine) ]and trimesoyl chloride (TMC) on the polyethersulfone (PES) support. Fourier transform infrared spectroscopy (FT-IR),environmental scanning electron microscopy (ESEM),atomic force microscopy (AFM) and water contact angle analysis were applied to characterize the resulted CCMM.The FT-IR spectrum indicates that TMC reacts sufficiently with polyamine.ESEM and AFM pictures show that the IP process produces a dense selective layer on the support membrane.The water contact angle of the CCMM is smaller than that of the substrate membrane because of the cross-linked hydrophilic polyamine network.Several factors affecting the IP reaction and the performance of the CCMM,such as monomer concentration,reaction time,pH value of aqueous phase solution and post-treatment,were studied.The pure water flux of the optimized CCMM is 14.73 L·m ^-2 ·h ^-1 ·MPa ^-1 at the operating pressure of 0.4 MPa.The values of separation factorαfor NaCl/PEG1000/water and MgC_l2/PEG1000/water are 11.89 and 9.96,respectively.These results demonstrate that CCMM is promising for the separation of low-molecular-weight organics from their salt aqueous solutions.

Key words: charged mosaic membranes, interfacial polymerization, polyamine, flux, retention

摘要： A novel composite charged mosaic membrane (CCMM) was prepared via interfacial polymerization (IP) of polyamine[poly (epichlorohydrin amine) ]and trimesoyl chloride (TMC) on the polyethersulfone (PES) support. Fourier transform infrared spectroscopy (FT-IR),environmental scanning electron microscopy (ESEM),atomic force microscopy (AFM) and water contact angle analysis were applied to characterize the resulted CCMM.The FT-IR spectrum indicates that TMC reacts sufficiently with polyamine.ESEM and AFM pictures show that the IP process produces a dense selective layer on the support membrane.The water contact angle of the CCMM is smaller than that of the substrate membrane because of the cross-linked hydrophilic polyamine network.Several factors affecting the IP reaction and the performance of the CCMM,such as monomer concentration,reaction time,pH value of aqueous phase solution and post-treatment,were studied.The pure water flux of the optimized CCMM is 14.73 L·m ^-2 ·h ^-1 ·MPa ^-1 at the operating pressure of 0.4 MPa.The values of separation factorαfor NaCl/PEG1000/water and MgC_l2/PEG1000/water are 11.89 and 9.96,respectively.These results demonstrate that CCMM is promising for the separation of low-molecular-weight organics from their salt aqueous solutions.

关键词: charged mosaic membranes, interfacial polymerization, polyamine, flux, retention

ZHANG Jingya, ZHANG Yanwu, ZHANG Haoqin, DANG Jingchuan, LIU Jindun. Preparation and Characterization of a Novel Polyamide Charged Mosaic Membrane[J]. Chin.J.Chem.Eng., 2010, 18(4): 569-576.

张景亚, 张延武, 张浩勤, 党敬川, 刘金盾. Preparation and Characterization of a Novel Polyamide Charged Mosaic Membrane[J]. Chinese Journal of Chemical Engineering, 2010, 18(4): 569-576.

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