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Fabrication and performance of in-situ ionic cross-linking polyelectrolyte complex nanofiltration membranes

  • ZHAO Fengyang ,
  • JI Yanli ,
  • AN Quanfu ,
  • GAO Congjie
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  • 1. MOE Key Laboratory of Macromolecular Synthesis and Functionalization; Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China;
    2. The Development Center of Water Treatment Technology, Hangzhou 310012, China

Received date: 2015-05-01

  Revised date: 2015-05-29

  Online published: 2015-08-14

Abstract

In order to obtain high water flux and salt rejection polyelectrolyte complex nanofiltration membranes (PECNFMs), a novel type of PECNFMs is prepared with the polyethyleneimine (PEI), the sodium alginate (SA) and the carboxymethyl cellulose (CMC) via the in-situ ionic cross-linking method. The chemical compositions, structures, and hydrophilicity of the PECNFMs are characterized by the Fourier transform infrared spectroscopy (FTIR), the field emission scanning electron microscope (FESEM), and the water contact angle (CA), respectively. The effects of the PEI mass ratios, the polyanionic types, the feed inorganic salts, and the operating temperature on the nanofiltration performance of the PECNFMs are investigated. It is shown that the in-situ ionic cross-linking PEI/ SA PECNFMs enjoy a higher water flux as compared to the PEI/CMCs with the some PEI mass ratio, and the surface charge of the PECNFMs could be turned from negative to positive by increasing the PEI mass ratio. With the optimized PEI/SA value of 0.9, a water flux of 13.4 L·m-2·h-1 is obtained with the MgCl2 rejection being maintained at around 94.0% (with 1 g·L-1 aqueous MgCl2 solution at 25℃ and 0.6 MPa). Moreover, with the PEI/SA value of 0.9, the best Na+/Mg2+ selectivity (αMg2+Na+=10.4) is secured. This study provides an approach for fabricating PECNFMs with high water flux and salt rejection via an in-situ ionic cross-linking method and opens new avenues for fabricating high performance nanofiltration membranes.

Cite this article

ZHAO Fengyang , JI Yanli , AN Quanfu , GAO Congjie . Fabrication and performance of in-situ ionic cross-linking polyelectrolyte complex nanofiltration membranes[J]. Science & Technology Review, 2015 , 33(14) : 87 -92 . DOI: 10.3981/j.issn.1000-7857.2015.14.016

References

[1] Ghizellaoui S, Taha S, Dorange G, et al. Softening of hamma drinking water by nanofiltration and by lime in the presence of heavy metals[J]. Desalination, 2004, 171(2): 133-138.
[2] 计艳丽, 安全福, 钱锦文, 等. 聚电解质层层自组装纳滤膜[J]. 化学进 展, 2010, 22(1): 119-124. Ji Yanli, An Quanfu, Qian Jinwen, et al. Nanofiltration membranes prepared by layer-by-layer self-assembly of polyelectrolyte[J]. Progress in Chemistry, 2010, 22(1): 119-124.
[3] Zhao Q, Ji Y L, Wu J K, et al. Polyelectrolyte complex nanofiltration membranes: Performance modulation via casting solution pH[J]. RSC Advances, 2014, 95(4): 52808-52814.
[4] Magnenet C, Lakard S, Buron C C, et al. Functionalization of organic membranes by polyelectrolyte multilayer assemblies: Application to the removal of copper ions from aqueous solutions[J]. Journal of Colloid and Interface Science, 2012, 376(1): 202-208.
[5] Rajabzadeh S, Liu C, Shi L, et al. Preparation of low-pressure water softening hollow fiber membranes by polyelectrolyte deposition with two bilayers[J]. Desalination, 2014, 344(1): 64-70.
[6] Zhao Q, An Q F, Ji Y L, et al. Polyelectrolyte complex membranes for pervaporation, nanofiltration and fuel cell applications[J]. Journal of Membrane Science, 2011, 379(1/2): 19-45.
[7] Ji Y L, An Q F, Zhao F Y, et al. Fabrication of chitosan/PDMCHEA blend positively charged membranes with improved mechanical properties and high nanofiltration performances[J]. Desalination, 2015, 357(2): 8-15.
[8] 杜瑞奎, 高保娇, 李延斌, 等. 聚砜阴离子交换膜的制备及结构与性能 研究[J]. 高分子学报, 2010(7): 924-931. Du Ruikui, Gao Baojiao, Li Yanbin, et al. Preparation and structure/ property relationship of polysulfone anion- exchange membranes[J]. Acta Polymerica Sinica, 2010(7): 924-931.
[9] Zhao Q, Qian J W, An Q F, et al. Synthesis and characterization of soluble chitosan/sodium carboxymethyl cellulose polyelectrolyte complexes and the pervaporation dehydration of their homogeneous membranes[J]. Journal of Membrane Science, 2009, 333(1/2): 68-78.
[10] Simsek- Ege F A, Bond G M, Stringer J. Polyelectrolye complex formation between alginate and chitosan as a function of pH[J]. Journal of Applied Polymer Science, 2003, 88(2): 346-351.
[11] Li M M, Xu J, Chang C Y, et al. Bioinspired fabrication of composite nanofiltration membrane based on the formation of DA/PEI layer followed by cross-linking[J]. Journal of Membrane Science, 2014, 459 (1): 62-71.
[12] Ji Y L, An Q F, Zhao Q, et al. Preparation of novel positively charged copolymer membranes for nanofiltration[J]. Journal of Membrane Science, 2011, 376(1/2): 254-265.
[13] Cheng C, Yaroshchuk A, Bruening M L. Fundamentals of selective ion transport through multilayer polyelectrolyte membranes[J]. Langmuir, 2013, 29(6): 1885-1892.
[14] Goosen M F A, Sablani S S, Al-Maskari S S, et al. Effect of feed temperature on permeate flux andmass transfer coefficient in spiralwound reverse osmosis systems[J]. Desalination, 2002, 144(1-3): 367- 372
[15] Manttari M, Pihlajamaki A, Kaipainen E, et al. Effect of temperature and membrane pre-treatment by pressure on the filtration properties of nanofiltration membranes[J]. Desalination, 2002, 145(1-3): 81-86.
[16] Du R H, Zhao J S. Properties of poly (N, N-dimethylaminoethyl methacrylate)/polysulfone positively charged composite nano fi ltration membrane[J]. Journal of Membrane Science, 2004, 239(2): 183-188.
[17] Huang R H, Chen G H, Sun M K, et al. Preparation and characterization of quaterinized chitosan/poly(acrylonitrile) composite nano fi ltration membrane from anhydride mixture cross- linking[J]. Separation and Purification Technology, 2008, 58(3): 393-399.
[18] Huang R H, Chen G H, Sun M K, et al. Studies on nanofiltration membrane formed by diisocyanate cross-linking of quaternized chitosan on poly(acrylonitrile) (PAN) support[J]. Journal of Membrane Science, 2006, 286(1/2): 237-244.
[19] Dong X, Li S H, Zhang Q F, et al. Preparation and characterization of novel positively charged copolymer composite membranes for nanofiltration[J]. RSC Advances, 2014, 43(4): 22625-22631.
[20] Jin W Q, Toutianoush A, Tieke B. Use of polyelectrolyte layer-bylayer assemblies as nanofiltration and reverse osmosis membranes[J]. Langmuir, 2003, 19(7): 2550-2553.
[21] Ouyang L, Malaisamy R, Bruening M L. Multilayer polyelectrolyte films as nanofiltration membranes for separating monovalent and divalent cations[J]. Journal of Membrane Science, 2008, 310(1/2): 76-84.
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