Ultrathin Covalent Organic Framework Membranes Prepared by Rapid Electrophoretic Deposition

Covalent organic frameworks (COFs) are a disruptive material platform for various novel applications including nanofiltration for water purification due to their excellent physicochemical features. Nevertheless, the currently available approaches for preparing COF membranes need stringent synthesis...

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Veröffentlicht in:Advanced materials (Weinheim) 2022-11, Vol.34 (44), p.e2204894-n/a
Hauptverfasser: Wang, Rui, Zhou, Yisa, Zhang, Ya, Xue, Jian, Caro, Jürgen, Wang, Haihui
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container_issue 44
container_start_page e2204894
container_title Advanced materials (Weinheim)
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creator Wang, Rui
Zhou, Yisa
Zhang, Ya
Xue, Jian
Caro, Jürgen
Wang, Haihui
description Covalent organic frameworks (COFs) are a disruptive material platform for various novel applications including nanofiltration for water purification due to their excellent physicochemical features. Nevertheless, the currently available approaches for preparing COF membranes need stringent synthesis conditions, prolonged fabrication time, and tedious post‐processing, leading to poor productivity. Herein, a simple and efficient layer‐by‐layer stacking assembly strategy is developed based on electrophoretic deposition (EPD) to rapidly generate ionic COF membranes due to the uniform driving force for nanosheet assembly. A new two‐cell EPD design avoids the usual EPD problems such as bubbles and acidic/alkaline microenvironments in the near‐electrode region in aqueous EPD processes. Ultrathin COF membranes with homogenous structures can be produced within several minutes. Consequently, the prepared COF membranes exhibit outstanding permselectivity and possess good stability and anti‐pressure ability due to their uniform architecture and unique chemical composition. A novel two‐cell electrophoretic deposition strategy to assemble covalent organic frameworks (COFs) nanosheets into ultrathin COF membranes with homogenous structures within several minutes is reported. The constructed COF membranes exhibit outstanding separation performance toward the negatively charged probe molecules with a dimension larger than 1 nm due to their uniform architecture and unique chemical composition.
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subjects Assembly
Chemical composition
Electrophoretic deposition
ionic covalent organic frameworks
Materials science
membrane separation
Membranes
molecular separation
Nanofiltration
nanosheets
Water purification
title Ultrathin Covalent Organic Framework Membranes Prepared by Rapid Electrophoretic Deposition
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