Effect of ZIF-71 ligand-exchange surface modification on biofuel recovery through pervaporation. (8th May 2020)

• Record Type: Journal Article
• Authors: Yin, Huidan; Cay-Durgun, Pinar; Lai, Tianmiao; Zhu, Guanghui; Engebretson, Kiah; Setiadji, Regina; Green, Matthew D.; Lind, Mary Laura
• Is Part Of: Polymer. Volume 195(2020)
• Publication Date: 2020-05-08
• Subjects: Pervaporation -- Ligand-exchange -- Mixed matrix membrane; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2020.122379
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: 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 ( 1 H NMR) spectroscopy confirmed the exchange of the new ligands into the ZIF-71 material. The 1 H 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. Graphical abstract: Image 1 Highlights: ZIF-71 particles were modified through the solvent-assisted linker exchange (SALE). The particles embedded in polydimethylsiloxane membranes via condensation cure method. The mixed matrix membranes were tested for removal of alcohol from dilute aqueous solutions. Ligand-exchanged particles embedded membranes demonstrated enhanced particle dispersion in the polymer matrix.