Metal-coordinated sub-10 nm membranes for water purification

Xinda You, Hong Wu (), Runnan Zhang, Yanlei Su, Li Cao, Qianqian Yu, Jinqiu Yuan, Ke Xiao, Mingrui He and Zhongyi Jiang ()
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Xinda You: Tianjin University
Hong Wu: Tianjin University
Runnan Zhang: Tianjin University
Yanlei Su: Tianjin University
Li Cao: Tianjin University
Qianqian Yu: Tianjin University
Jinqiu Yuan: Tianjin University
Ke Xiao: Tianjin University
Mingrui He: Tianjin University
Zhongyi Jiang: Tianjin University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Ultrathin membranes with potentially high permeability are urgently demanded in water purification. However, their facile, controllable fabrication remains a grand challenge. Herein, we demonstrate a metal-coordinated approach towards defect-free and robust membranes with sub-10 nm thickness. Phytic acid, a natural strong electron donor, is assembled with metal ion-based electron acceptors to fabricate metal-organophosphate membranes (MOPMs) in aqueous solution. Metal ions with higher binding energy or ionization potential such as Fe3+ and Zr4+ can generate defect-free structure while MOPM-Fe3+ with superhydrophilicity is preferred. The membrane thickness is minimized to 8 nm by varying the ligand concentration and the pore structure of MOPM-Fe3+ is regulated by varying the Fe3+ content. The membrane with optimized MOPM-Fe3+ composition exhibits prominent water permeance (109.8 L m−2 h−1 bar−1) with dye rejections above 95% and superior stability. This strong-coordination assembly may enlighten the development of ultrathin high-performance membranes.

Date: 2019
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DOI: 10.1038/s41467-019-12100-0

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