Ultrathin Covalent Organic Framework Membranes Prepared by Rapid Electrophoretic Deposition,Advanced Materials

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Ultrathin Covalent Organic Framework Membranes Prepared by Rapid Electrophoretic Deposition
Advanced Materials ( IF 27.4 ) Pub Date : 2022-09-01 , DOI: 10.1002/adma.202204894
Rui Wang ₁ , Yisa Zhou ₁ , Ya Zhang ₁ , Jian Xue ₁ , Jürgen Caro ₂ , Haihui Wang ₃

Affiliation

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.

中文翻译：

快速电泳沉积法制备超薄共价有机骨架膜

共价有机框架 (COF) 因其优异的物理化学特性而成为各种新型应用的颠覆性材料平台，包括用于水净化的纳滤。然而，目前制备COF膜的可用方法需要严格的合成条件、延长的制造时间和繁琐的后处理，导致生产率低下。在此，基于电泳沉积（EPD）开发了一种简单有效的逐层堆叠组装策略，由于纳米片组装的均匀驱动力，可以快速生成离子COF膜。一种新的双电池 EPD 设计避免了常见的 EPD 问题，例如水性 EPD 工艺中近电极区域中的气泡和酸性/碱性微环境。可以在几分钟内生产出具有均匀结构的超薄 COF 膜。因此，所制备的 COF 膜由于其均匀的结构和独特的化学成分，表现出优异的选择性渗透性，并具有良好的稳定性和抗压能力。

更新日期：2022-09-01

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