Hydrogel-embedded vertically aligned metal-organic framework nanosheet membrane for efficient water harvesting

Lingyue Zhang, Ruiying Li, Shuang Zheng, Hai Zhu, Moyuan Cao, Mingchun Li, Yaowen Hu, Li Long, Haopeng Feng and Chuyang Y. Tang ()
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Lingyue Zhang: The University of Hong Kong
Ruiying Li: The University of Hong Kong
Shuang Zheng: The University of Hong Kong
Hai Zhu: The University of Hong Kong
Moyuan Cao: Nankai University
Mingchun Li: Tsinghua University
Yaowen Hu: The University of Hong Kong
Li Long: The University of Hong Kong
Haopeng Feng: The University of Hong Kong
Chuyang Y. Tang: The University of Hong Kong

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Highly porous metal-organic framework (MOF) nanosheets have shown promising potential for efficient water sorption kinetics in atmospheric water harvesting (AWH) systems. However, the water uptake of single-component MOF absorbents remains limited due to their low water retention. To overcome this limitation, we present a strategy for fabricating vertically aligned MOF nanosheets on hydrogel membrane substrates (MOF-CT/PVA) to achieve ultrafast AWH with high water uptake. By employing directional growth of MOF nanosheets, we successfully create superhydrophilic MOF coating layer and pore channels for efficient water transportation to the crosslinked flexible hydrogel membrane. The designed composite water harvester exhibits ultrafast sorption kinetics, achieving 91.4% saturation within 15 min. Moreover, MOF-CT/PVA exhibits superior solar-driven water capture-release capacity even after 10 cycles of reuse. This construction approach significantly enhances the water vapor adsorption, offering a potential solution for the design of composite MOF-membrane harvesters to mitigate the freshwater crisis.

Date: 2024
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DOI: 10.1038/s41467-024-54215-z

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