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Asymmetric polyamide nanofilms with highly ordered nanovoids for water purification

Author

Listed:
  • Bingbing Yuan

    (Henan Normal University)

  • Shengchao Zhao

    (Shenzhen University
    China University of Petroleum (East China))

  • Ping Hu

    (Henan Normal University)

  • Jiabao Cui

    (Henan Normal University)

  • Q. Jason Niu

    (Shenzhen University
    China University of Petroleum (East China))

Abstract

Tailor-made structure and morphology are critical to the highly permeable and selective polyamide membranes used for water purification. Here we report an asymmetric polyamide nanofilm having a two-layer structure, in which the lower is a spherical polyamide dendrimer porous layer, and the upper is a polyamide dense layer with highly ordered nanovoids structure. The dendrimer porous layer was covalently assembled in situ on the surface of the polysulfone (PSF) support by a diazotization-coupling reaction, and then the asymmetric polyamide nanofilm with highly ordered hollow nanostrips structure was formed by interfacial polymerization (IP) thereon. Tuning the number of the spherical dendrimer porous layers and IP time enabled control of the nanostrips morphology in the polyamide nanofilm. The asymmetric polyamide membrane exhibits a water flux of 3.7−4.3 times that of the traditional monolayer polyamide membrane, showing an improved divalent salt rejection rate (more than 99%), which thus surpasses the upper bound line of the permeability−selectivity performance of the existing various structural polyamide membranes. We estimate that this work might inspire the preparation of highly permeable and selective reverse osmosis (RO), organic solvent nanofiltration (OSNF) and pervaporation (PV) membranes.

Suggested Citation

  • Bingbing Yuan & Shengchao Zhao & Ping Hu & Jiabao Cui & Q. Jason Niu, 2020. "Asymmetric polyamide nanofilms with highly ordered nanovoids for water purification," Nature Communications, Nature, vol. 11(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19809-3
    DOI: 10.1038/s41467-020-19809-3
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    Cited by:

    1. Changwei Zhao & Yanjun Zhang & Yuewen Jia & Bojun Li & Wenjing Tang & Chuning Shang & Rui Mo & Pei Li & Shaomin Liu & Sui Zhang, 2023. "Polyamide membranes with nanoscale ordered structures for fast permeation and highly selective ion-ion separation," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Jin Ming Wang & Qin Yao Zhu & Jeong Heon Lee & Tae Gyun Woo & Yue Xing Zhang & Woo-Dong Jang & Tae Kyu Kim, 2023. "Asymmetric gradient orbital interaction of hetero-diatomic active sites for promoting C − C coupling," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
    3. Huawen Peng & Kaicheng Yu & Xufei Liu & Jiapeng Li & Xiangguo Hu & Qiang Zhao, 2023. "Quaternization-spiro design of chlorine-resistant and high-permeance lithium separation membranes," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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