SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 57 ›› Issue (5): 193-201.DOI: 10.1016/j.cjche.2022.08.007

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Ultrathin polyamide nanofiltration membrane prepared by triazine-based porous organic polymer as interlayer for dye removal

Yongbo Liu1,2, Zhihao Si1,2, Cong Ren1,3, Hanzhu Wu1, Peng Zhan2, Yuqing Peng2, Peiyong Qin1,2   

  1. 1. National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing 100029, China;
    2. College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
    3. Beijing Key Laboratory of Membrane Science and Technology, College of Chemical, Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2022-05-14 Revised:2022-08-08 Online:2023-07-08 Published:2023-05-28
  • Contact: Peiyong Qin,E-mail:qinpeiyong@tsinghua.org.cn
  • Supported by:
    This work was funded by National Key Research and Development Program of China (2021YFC2101202), Bingtuan Science and Technology Program (2022DB025), Beijing Natural Science Foundation (2222015), Hebei Province Key Research and Development Program (21327316D), China Postdoctoral Science Foundation (2021M700011) and the long-term subsidy mechanism from the Ministry of Finance and the Ministry of Education of China.

Ultrathin polyamide nanofiltration membrane prepared by triazine-based porous organic polymer as interlayer for dye removal

Yongbo Liu1,2, Zhihao Si1,2, Cong Ren1,3, Hanzhu Wu1, Peng Zhan2, Yuqing Peng2, Peiyong Qin1,2   

  1. 1. National Energy R&D Center for Biorefinery, Beijing University of Chemical Technology, Beijing 100029, China;
    2. College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China;
    3. Beijing Key Laboratory of Membrane Science and Technology, College of Chemical, Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • 通讯作者: Peiyong Qin,E-mail:qinpeiyong@tsinghua.org.cn
  • 基金资助:
    This work was funded by National Key Research and Development Program of China (2021YFC2101202), Bingtuan Science and Technology Program (2022DB025), Beijing Natural Science Foundation (2222015), Hebei Province Key Research and Development Program (21327316D), China Postdoctoral Science Foundation (2021M700011) and the long-term subsidy mechanism from the Ministry of Finance and the Ministry of Education of China.

Abstract: Separation membrane with high flux is generally encouraged in industrial application, because of the tremendous needs for decreasing membrane areas, usage costs and space requirements. The most effective and direct method for obtaining the high flux is to decrease membrane thickness. Polyamide (PA) nanofiltration membrane is conventionally prepared by the direct interfacial polymerization (IP) on substrate surface, and results in a thick PA layer. In this work, we proposed a strategy that constructing triazine-based porous organic polymer (TRZ-POP) as the interlayer to prepare the ultrathin PA nanofiltration membranes. TRZ-POP is firstly deposited on the polyethersulfone substrate, and then the formed TRZ-POP provides more adhesion sites towards PA based on its high specific surface areas. The chemical bonding between terminal amine group of TRZ-POP and the amide group of PA further improves the binding force, and strengthens the stability of PA layer. More importantly, the high porosity of TRZ-POP layer causes the higher polymerization of initial PA owning to the stored sufficient amino monomer; and H-bonding interaction between amine groups of TRZ-POP and piperazine (PIP) can astrict the release of PIP. Thus, IP process is controlled, and the thinnest thickness of prepared PA layer is only < 15 nm. As expected, PA/TRZ-POP membrane shows a more excellent water flux of 1414 L·m-2·h-1·MPa-1 than that of the state-of-the-art nanofiltration membranes, and without sacrificing dye rejection. The build of TRZ-POP interlayer develops a new method for obtaining a high-flux nanofiltration membrane.

Key words: Polyamide, Nanofiltration, Interfacial polymerization, Triazine-based porous organic polymer

摘要: Separation membrane with high flux is generally encouraged in industrial application, because of the tremendous needs for decreasing membrane areas, usage costs and space requirements. The most effective and direct method for obtaining the high flux is to decrease membrane thickness. Polyamide (PA) nanofiltration membrane is conventionally prepared by the direct interfacial polymerization (IP) on substrate surface, and results in a thick PA layer. In this work, we proposed a strategy that constructing triazine-based porous organic polymer (TRZ-POP) as the interlayer to prepare the ultrathin PA nanofiltration membranes. TRZ-POP is firstly deposited on the polyethersulfone substrate, and then the formed TRZ-POP provides more adhesion sites towards PA based on its high specific surface areas. The chemical bonding between terminal amine group of TRZ-POP and the amide group of PA further improves the binding force, and strengthens the stability of PA layer. More importantly, the high porosity of TRZ-POP layer causes the higher polymerization of initial PA owning to the stored sufficient amino monomer; and H-bonding interaction between amine groups of TRZ-POP and piperazine (PIP) can astrict the release of PIP. Thus, IP process is controlled, and the thinnest thickness of prepared PA layer is only < 15 nm. As expected, PA/TRZ-POP membrane shows a more excellent water flux of 1414 L·m-2·h-1·MPa-1 than that of the state-of-the-art nanofiltration membranes, and without sacrificing dye rejection. The build of TRZ-POP interlayer develops a new method for obtaining a high-flux nanofiltration membrane.

关键词: Polyamide, Nanofiltration, Interfacial polymerization, Triazine-based porous organic polymer