SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2017, Vol. 25 ›› Issue (11): 1685-1694.DOI: 10.1016/j.cjche.2017.06.001

• 膜和膜过程专刊 • 上一篇    

Positively charged nanofiltration membrane fabricated by poly(acid-base) complexing effect induced phase inversion method forheavy metal removal

Chunli Liu1,2, Weihui Bi1, Dongliang Chen1, Suobo Zhang1,3, Hongchao Mao1   

  1. 1 Key Laboratory of Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    2 University of Chinese Academy of Sciences, Beijing 100039, China;
    3 Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing 211816, China
  • 收稿日期:2017-02-16 修回日期:2017-06-02 出版日期:2017-11-28 发布日期:2018-01-18
  • 通讯作者: Suobo Zhang,E-mail addresses:sbzhang@ciac.ac.cn;Hongchao Mao,E-mail addresses:mhc2009@ciac.ac.cn
  • 基金资助:

    Supported by the National Basic Research Program of China (2015CB655302), the National Science Foundation of China (51133008, 51473163 and 51503199) and the Development of Scientific and Technological Project of the Jilin Province (20160101316JC).

Positively charged nanofiltration membrane fabricated by poly(acid-base) complexing effect induced phase inversion method forheavy metal removal

Chunli Liu1,2, Weihui Bi1, Dongliang Chen1, Suobo Zhang1,3, Hongchao Mao1   

  1. 1 Key Laboratory of Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    2 University of Chinese Academy of Sciences, Beijing 100039, China;
    3 Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM), Nanjing 211816, China
  • Received:2017-02-16 Revised:2017-06-02 Online:2017-11-28 Published:2018-01-18
  • Contact: Suobo Zhang,E-mail addresses:sbzhang@ciac.ac.cn;Hongchao Mao,E-mail addresses:mhc2009@ciac.ac.cn
  • Supported by:

    Supported by the National Basic Research Program of China (2015CB655302), the National Science Foundation of China (51133008, 51473163 and 51503199) and the Development of Scientific and Technological Project of the Jilin Province (20160101316JC).

摘要: Poly(arylene ether ketone)s with carboxylic groups (PAEK-COOH) is a good membrane fabrication material, a kind of polyacids, while polyethylenimine (PEI) is a weak organic base, a kind of polybases. Those polyacids and polybases would form ionic complexation at the interface of two liquid phases. In this paper, PAEK-COOH/N-methyl pyrrolidone (NMP)/1,4-dioxane (DO) mixture, employed as polymer casting solution and aqueous solution of PEI, used as coagulation bath, respectively. Then ion complexation induced phase inversion process is applied to prepare positively charged nanofiltration membrane with thinner but denser separation skin layer. The complexing reaction at the interface of two liquid phases has great influence on the kinetic aspects of phase inversion process, which in accordance would affect the morphology and performance of the membrane. The obtained membrane, fabricated via the ion complexation induced phase inversion method, is positively charged, has high water permeability, and possesses high rejection towards divalent cations, such as Mg2+, Ca2+, Pb2+ etc., which could be used for removal of heavy metals from polluted water. At the optimal condition, the pure water flux of the PAEK-COOH-PEI nanofiltration membrane is 24.3 L·m-2·h-1, with MgCl2 rejection of 92.2%.

关键词: Polyelectrolyte complex, Carboxylated polymer, Polyethylenimine, Nanofiltration, Water purification

Abstract: Poly(arylene ether ketone)s with carboxylic groups (PAEK-COOH) is a good membrane fabrication material, a kind of polyacids, while polyethylenimine (PEI) is a weak organic base, a kind of polybases. Those polyacids and polybases would form ionic complexation at the interface of two liquid phases. In this paper, PAEK-COOH/N-methyl pyrrolidone (NMP)/1,4-dioxane (DO) mixture, employed as polymer casting solution and aqueous solution of PEI, used as coagulation bath, respectively. Then ion complexation induced phase inversion process is applied to prepare positively charged nanofiltration membrane with thinner but denser separation skin layer. The complexing reaction at the interface of two liquid phases has great influence on the kinetic aspects of phase inversion process, which in accordance would affect the morphology and performance of the membrane. The obtained membrane, fabricated via the ion complexation induced phase inversion method, is positively charged, has high water permeability, and possesses high rejection towards divalent cations, such as Mg2+, Ca2+, Pb2+ etc., which could be used for removal of heavy metals from polluted water. At the optimal condition, the pure water flux of the PAEK-COOH-PEI nanofiltration membrane is 24.3 L·m-2·h-1, with MgCl2 rejection of 92.2%.

Key words: Polyelectrolyte complex, Carboxylated polymer, Polyethylenimine, Nanofiltration, Water purification