Tight Covalent Organic Framework Membranes for Efficient Anion Transport via Molecular Precursor Engineering
| Autor: | Benbing Shi, Chunyang Fan, Zhenjie Zhang, Quan Peng, Guangwei He, Li Cao, Runlai Li, Yi Yang, Xueyi He, Zhongyi Jiang, Yiqin Liu, Yan Kong, Hong Wu |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
technology industry and agriculture Aqueous two-phase system General Medicine General Chemistry Interfacial polymerization Aldehyde Catalysis chemistry.chemical_compound Membrane chemistry Polymerization Chemical engineering Covalent bond Hydroxide Covalent organic framework |
| Zdroj: | Angewandte Chemie International Edition. 60:17638-17646 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.202105190 |
| Popis: | Fabricating covalent organic frameworks (COFs) membranes with tight structure, which can fully utilize well-defined framework structure and thus achieve superior conduction performance, remains a grand challenge. Herein, through molecular precursor engineering of COFs, we reported the fabrication of tight COFs membrane with the ever-reported highest hydroxide ion conductivity over 200 mS cm-1 at 80 °C, 100 % RH. Six quaternary ammonium-functionalized COFs were synthesized by assembling functional hydrazides and different aldehyde precursors. In an organic-aqueous reaction system, the impact of the aldehyde precursors with different size, electrophilicity and hydrophilicity on the reaction-diffusion process for fabricating COFs membranes was elucidated. Particularly, more hydrophilic aldehydes were prone to push the reaction zone from the interface region to the aqueous phase of the reaction system, the tight membranes were thus fabricated via phase-transfer polymerization process, conferring around 4-8 times the anion conductivity over the loose membranes via interfacial polymerization process. |
| Databáze: | OpenAIRE |
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