Effect of ZIF-71 ligand-exchange surface modification on biofuel recovery through pervaporation
| Autor: | Pinar Cay-Durgun, Regina Setiadji, Tianmiao Lai, Mary Laura Lind, Matthew D. Green, Kiah Engebretson, Huidan Yin, Guanghui Zhu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Aqueous solution
Polymers and Plastics Polydimethylsiloxane Chemistry Organic Chemistry Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Membrane Chemical engineering Imidazolate Materials Chemistry Proton NMR Surface modification Pervaporation 0210 nano-technology |
| Zdroj: | Polymer. 195:122379 |
| ISSN: | 0032-3861 |
| Popis: | In this paper, zeolitic imidazolate framework-71 (ZIF-71) particles (~500 nm diameter) were modified with four different ligands through the solvent-assisted linker exchange (SALE) method. The objective of this was to assess the effect of ligand exchanged ZIF-71 on the performance of ZIF-71/polydimethylsiloxane (PDMS) mixed matrix membranes (MMMs) for removal of alcohol from dilute aqueous solutions. Both Fourier-transform infrared spectroscopy (ATR-FTIR) and proton nuclear magnetic resonance (1H NMR) spectroscopy confirmed the exchange of the new ligands into the ZIF-71 material. The 1H NMR spectra demonstrated the molar ratios of the ligand-exchange into the ZIF-71 particles. X-ray diffraction and scanning electron microscopy results showed that the crystal structure and the morphology of ZIF-71 were maintained after the ligand-exchange modification process. Modified ZIF-71/PDMS composite membranes were synthesized to study the effect of ligand modification on alcohol/water separation performance. Ligand-modified ZIFs dispersed more evenly in the condensation cure PDMS polymer matrix than the unmodified ZIFs. The alcohol permeability and alcohol/water selectivity for ethanol and 1-butanol remained the same or decreased for membranes made with ligand-exchanged ZIF-71 particles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect