SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 45 ›› Issue (5): 194-202.DOI: 10.1016/j.cjche.2021.05.002

• • 上一篇    下一篇

Highly permeable reverse osmosis membranes incorporated with hydrophilic polymers of intrinsic microporosity via interfacial polymerization

Jing Dou1, Shuo Han1, Saisai Lin1, Zhikan Yao1,2, Lian Hou1,3, Lin Zhang1,2   

  1. 1 Engineering Research Center of Membrane and Water Treatment of MOE, College of Chemical & Biological Engineering, Zhejiang University, Hangzhou 310027, China;
    2 Research Institute of Ningbo, Zhejiang University, Ningbo 315100, China;
    3 Xi'an High-Tech Institute, Xi'an 710025, China
  • 收稿日期:2020-12-31 修回日期:2021-04-27 出版日期:2022-05-28 发布日期:2022-06-22
  • 通讯作者: Saisai Lin,E-mail:saislin@zju.edu.cn
  • 基金资助:
    This work was supported by Zhejiang Provincial Natural Science Foundation of China (LZ20B060001), National Natural Science Foundation of China (22008208 & 21908192), and China Postdoctoral Science Foundation (2019TQ0276).

Highly permeable reverse osmosis membranes incorporated with hydrophilic polymers of intrinsic microporosity via interfacial polymerization

Jing Dou1, Shuo Han1, Saisai Lin1, Zhikan Yao1,2, Lian Hou1,3, Lin Zhang1,2   

  1. 1 Engineering Research Center of Membrane and Water Treatment of MOE, College of Chemical & Biological Engineering, Zhejiang University, Hangzhou 310027, China;
    2 Research Institute of Ningbo, Zhejiang University, Ningbo 315100, China;
    3 Xi'an High-Tech Institute, Xi'an 710025, China
  • Received:2020-12-31 Revised:2021-04-27 Online:2022-05-28 Published:2022-06-22
  • Contact: Saisai Lin,E-mail:saislin@zju.edu.cn
  • Supported by:
    This work was supported by Zhejiang Provincial Natural Science Foundation of China (LZ20B060001), National Natural Science Foundation of China (22008208 & 21908192), and China Postdoctoral Science Foundation (2019TQ0276).

摘要: Enhancing the water permeation while maintaining high salt rejection of existing reverse osmosis (RO) membranes remains a considerable challenge. Herein, we proposed to introduce polymer of intrinsic microporosity, PIM-1, into the selective layer of reverse osmosis membranes to break the trade-off effect between permeability and selectivity. A water-soluble a-LPIM-1 of low-molecular-weight and hydroxyl terminals was synthesized. These designed characteristics endowed it with high solubility and reactivity. Then it was mixed with m-phenylenediamine and together served as aqueous monomer to react with organic monomer of trimesoyl chloride via interfacial polymerization. The characterization results exhibited that more “nodule” rather than “leaf” structure formed on RO membrane surface, which indicated that the introduction of the high free-volume of a-LPIM-1 with three dimensional twisted and folded structure into the selective layer effectively caused the frustrated packing between polymer chains. In virtue of this effect, even with reduced surface roughness and unchanged layer thickness, the water permeability of prepared reverse osmosis membranes increased 2.1 times to 62.8 L·m-2·h-1 with acceptable NaCl rejection of 97.6%. This attempt developed a new strategy to break the trade-off effect faced by traditional polyamide reverse osmosis membranes.

关键词: PIM-1, Intrinsic microporosity, Reverse osmosis, Interfacial polymerization, Trade-off

Abstract: Enhancing the water permeation while maintaining high salt rejection of existing reverse osmosis (RO) membranes remains a considerable challenge. Herein, we proposed to introduce polymer of intrinsic microporosity, PIM-1, into the selective layer of reverse osmosis membranes to break the trade-off effect between permeability and selectivity. A water-soluble a-LPIM-1 of low-molecular-weight and hydroxyl terminals was synthesized. These designed characteristics endowed it with high solubility and reactivity. Then it was mixed with m-phenylenediamine and together served as aqueous monomer to react with organic monomer of trimesoyl chloride via interfacial polymerization. The characterization results exhibited that more “nodule” rather than “leaf” structure formed on RO membrane surface, which indicated that the introduction of the high free-volume of a-LPIM-1 with three dimensional twisted and folded structure into the selective layer effectively caused the frustrated packing between polymer chains. In virtue of this effect, even with reduced surface roughness and unchanged layer thickness, the water permeability of prepared reverse osmosis membranes increased 2.1 times to 62.8 L·m-2·h-1 with acceptable NaCl rejection of 97.6%. This attempt developed a new strategy to break the trade-off effect faced by traditional polyamide reverse osmosis membranes.

Key words: PIM-1, Intrinsic microporosity, Reverse osmosis, Interfacial polymerization, Trade-off