Covalent Organic Framework Membranes from Oppositely Charged Nanosheets toward Efficient Desalination

Ziting Zhu; Hongjian Wang; Cheng Ling; Yue Zhang; Jiashuai Zhao; Yuhan Wang; Junyi Zhao; Fusheng Pan; Chunlei Wang; Zhongyi Jiang

doi:10.1002/smll.202401172

Covalent Organic Framework Membranes from Oppositely Charged Nanosheets toward Efficient Desalination

Small. 2024 Mar 29:e2401172. doi: 10.1002/smll.202401172. Online ahead of print.

Authors

Ziting Zhu^{1

2}, Hongjian Wang^{1

2

3}, Cheng Ling^{4

5}, Yue Zhang^{4

5}, Jiashuai Zhao^{1

2}, Yuhan Wang^{1

2}, Junyi Zhao^{1

2}, Fusheng Pan^{1

2

3}, Chunlei Wang⁶, Zhongyi Jiang^{1

2

3}

Affiliations

¹ Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
² Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300072, China.
³ School of Chemistry and Chemical Engineering, Hainan University, Haikou, Hainan, 570228, China.
⁴ Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
⁵ University of Chinese Academy of Sciences, Beijing, 100049, China.
⁶ College of Sciences, Shanghai University, Shanghai, 200444, China.

PMID: 38552220
DOI: 10.1002/smll.202401172

Abstract

Fabricating covalent organic framework (COF) membranes through the pre-assembly of nanosheets with different properties may open a novel avenue to the fabrication of advanced 2D membranes. Herein, COF membranes are fabricated using oppositely-charged COF nanosheets (CONs). Negatively-charged CONs and positively-charged CONs are pre-assembled through simple physical mixing, yielding the CONs with an aspect ratio of exceeding 10 000, which are assembled into three kinds of COF membranes. The optimal membranes exhibit the highest desalination performance with permeation flux of 132.66 kg m^-2 h^-1, salt rejection of 99.99%, and superior long-term operation stability.

Keywords: covalent organic framework membrane; desalination; oppositely‐charged nanosheets; pre‐assembly.

Abstract

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