Aromatic porous polymer network membranes for organic solvent nanofiltration under extreme conditions
| Autor: | Sai Che, Jongbok Lee, Chenxu Wang, Evan R. C. Rutledge, Caili Zhang, Chenxuan Li, Alexander J. Kalin, Lei Fang, Zi-Hao Guo, Hong-Cai Zhou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Renewable Energy Sustainability and the Environment Chemistry 02 engineering and technology General Chemistry Polymer Permeance 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Membrane Chemical engineering Permeability (electromagnetism) Molecule General Materials Science Nanofiltration 0210 nano-technology Porosity Selectivity |
| Zdroj: | Journal of Materials Chemistry A. 8:15891-15899 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Aromatic porous polymer networks (PPNs) are promising candidate materials for organic solvent nanofiltration (OSN) membranes, in which molecular-sieving selectivity, high permeability, and chemical/structural stability can be integrated. In this work, aromatic PPN membranes p-PPN, m-PPN and tri-PPN are fabricated by in situ aldol triple condensation cross-linking. These membranes demonstrate high stability, permeability and sharp selectivity in OSN, thanks to the aromatic nature of the backbone, high surface area (up to 1235 m2 g−1), and narrowly distributed pore sizes. They possess a high organic solvent permeability so that a good permeance is achieved despite a thickness of over 100 μm. The molecular weight cut-off and molecular weight retention onset of these membranes are ∼600 g mol−1 and 350 g mol−1, respectively, making it possible to efficiently separate molecules from a complex mixture composed of compounds with only marginally different molecular weights. As a result of the highly stable nature of the aromatic backbones, these PPN membranes show retained structural integrity and OSN performance in the presence of either a strong acid or strong base for over 50 h. The extraordinary stability integrated with excellent permeability and selectivity renders these PPN membranes promising candidates for challenging OSN applications under extreme conditions. |
| Databáze: | OpenAIRE |
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