受生物矿化启发合成用于高效脱盐膜的杂化共价有机框架纳米片

Biomineralization-Inspired Synthesis of Hybrid COF Nanosheets toward Efficient Desalination Membranes.

作者信息

Zhao Junyi, Wang Yuhan, Zhang Zhiming, Zhu Ziting, Zeng Shichen, Yang Guangzhaoyao, Zhang Sui, Pan Fusheng, Jiang Zhongyi

机构信息

Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China.

Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Singapore.

出版信息

Small. 2024 Jun;20(26):e2310566. doi: 10.1002/smll.202310566. Epub 2024 Jan 28.

DOI:10.1002/smll.202310566

PMID:38282104

Abstract

Synthesis of covalent organic framework nanosheets (CONs) with high aspect ratio is crucial to their assembly into advanced membranes. Nonetheless, the π-π stacking between covalent organic framework (COF) layers often leads to thick CONs. Herein, inspired by biomineralization process, a series of aspect ratio CONs >15 000 is synthesized by multifunctional polyelectrolytes which not only provide the nucleation sites for pre-assembly with COF monomer, but also suppress π-π interaction for anisotropic growth through protonation. The membrane assembled from CONs exhibited water permeance of 341 kg m h and salt rejection of 99.5% in desalination, outperforming ever-reported membranes. This method establishes a platform for the synthesis of crystalline nanosheets.

摘要

合成具有高纵横比的共价有机框架纳米片（CONs）对于将其组装成先进的膜至关重要。然而，共价有机框架（COF）层之间的π-π堆积通常会导致CONs变厚。在此，受生物矿化过程的启发，通过多功能聚电解质合成了一系列纵横比>15000的CONs，这些聚电解质不仅为与COF单体的预组装提供成核位点，还通过质子化抑制π-π相互作用以实现各向异性生长。由CONs组装而成的膜在脱盐过程中表现出341 kg m⁻² h⁻¹的水渗透通量和99.5%的盐截留率，优于以往报道的膜。该方法为结晶纳米片的合成建立了一个平台。