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    Ultrafast seawater desalination with covalent organic framework membranes

    Year: 2022

    Journal: Nat. Sustain., Volume 5, JUN, page 518–526

    Authors: Wang, Meidi; Zhang, Penghui; Liang, Xu; Zhao, Junyi; Liu, Yawei; Cao, Yu; Wang, Hongjian; Chen, Yu; Zhang, Zhiming; Pan, Fusheng; Zhang, Zhenjie; Jiang, Zhongyi

    Organizations: National Natural Science Foundation of China [22178251, 21878216, 91934302, 21838008, 21878215]; National Key Research and Development Programme of China [2021YFC2101200, 2021YFB3802200]; Programme of Introducing Talents of Discipline to Universities [BP0618007]

    The lack of access to clean water for billions of people represents a fundamental global sustainability challenge that must be addressed. Seawater desalination using membrane technologies provides a promising solution; however, the dominating desalination membranes often show low permeation flux and deficient fouling resistance. Here we achieve ultrafast desalination by taking advantage of covalent organic framework (COF) membranes where TaPa-SO3H nanosheets are linked by TpTTPA nanoribbons through electrostatic and pi-pi interactions to form an ordered and robust structure. The optimum COF membrane exhibits excellent rejection of NaCl (99.91%) and more importantly an ultrafast water flux of 267 kg m(-2) h(-1), which outperforms the state-of-the-art designs and is 4-10 times higher than conventional membranes. Furthermore, the desired fouling resistance underpins superior operational stability (108 h) and high salinity (7.5 wt%) tolerance, offering great potential in practical applications.
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