Volume 21, Issue 12 2410140
Research Article

Ultrathin Azine Covalent Organic Framework Membrane for Highly-Efficient Nanofluidic Osmotic Energy Generator

He Wen

He Wen

Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Wuhan, Hubei, 430074 China

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Jing Wang

Jing Wang

Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Wuhan, Hubei, 430074 China

Hubei Provincial Engineering Laboratory for Solid Waste Treatment Disposal and Recycling, Wuhan, Hubei, 430074 China

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei, 430074 China

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Ziwen Dai

Ziwen Dai

Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Wuhan, Hubei, 430074 China

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Xing Liu

Xing Liu

Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Wuhan, Hubei, 430074 China

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Sha Liang

Sha Liang

Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Wuhan, Hubei, 430074 China

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Fang Xu

Fang Xu

Wenzhou Haichen Technology Development Co., Ltd., Wenzhou, Zhejiang, 325700 China

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Zhen Hu

Zhen Hu

Wuhan Huzhenyu Environmental Technology Co., Ltd., Wuhan, Hubei, 430000 China

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Zhao Yang

Zhao Yang

Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, Leuven, B-3001 Belgium

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Pengrui Jin

Pengrui Jin

Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, Leuven, B-3001 Belgium

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Jiakuan Yang

Jiakuan Yang

Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Wuhan, Hubei, 430074 China

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Bart Van der Bruggen

Bart Van der Bruggen

Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, Leuven, B-3001 Belgium

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Shushan Yuan

Corresponding Author

Shushan Yuan

Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science & Engineering, Wuhan, Hubei, 430074 China

Hubei Three Gorges Laboratory, Yichang, 443007 China

E-mail: [email protected]

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First published: 13 February 2025
Citations: 2

Abstract

Charged covalent organic framework (COF) membranes have gained wide interest as the key component in the reverse electrodialysis technique to harness salinity energy. However, maintaining rapid ion transport and high selectivity in a Ca2+-rich environment remains a formidable challenge. Herein, a highly cation-conductive azine COF membrane is synthesized via a layer-by-layer chemical reaction between 2,4-dihydroxy-1,3,5-diphenyltrialdehyde (DHTA) and hydrazine hydrate (HZ). The osmotic energy generator based on this membrane delivers a high power density of 17.8 W m−2 under 2.5 M/0.05 M CaCl2, outperforming the TFP-HZ membrane (3.2 W m−2), commercial benchmark (5 W m−2), and other literature reported membranes owing to the simultaneous modulation of charges in angstrom scale channels and selective layer thickness. Moreover, this osmotic power density is comparable to that in a NaCl gradient (2.5 M/0.05 M, 16.9 W m−2), which is rare. These results indicate that the DHTA-HZ membrane is highly suitable for application in hypersaline environments containing Ca2+, serving as an inspiration for the development of COF-based nanofluidic membranes with high power output efficiency in a practical high-salinity environment.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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