Synthesis and stability of zeolitic imidazolate framework-68 membranes

Alexandra Kasik, Xueliang Dong, Jerry Lin

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Large pore zeolitic imidazolate framework (ZIF) membranes offer potential for separation of gases with different adsorption affinity on ZIF crystals and separation of liquid molecules by molecular sieving. In this work continuous, highly crystalline, largely c-oriented ZIF-68 membranes were reproducibly synthesized on macroporous zinc oxide supports by the reactive seeding method. The membranes were roughly 50 microns thick and the single component gas permeance measurements obtained adhered to Knudsen diffusion, indicating the presence of limited nonselective defects. The membranes were found to be highly stable at room temperature and ambient conditions, although immersion in water at room temperature and 100 °C caused irreparable damage to the ZIF-68 crystallinity. Immersion in organic solvents did not render the crystallinity notably altered. A prolonged p-xylene pervaporation run indicated that ZIF-68 membranes were susceptible to fouling, by showing an approximately 55% decrease in p-xylene pervaporation flux from when the membrane was fresh to the second data point tested at 4 h. The extent of fouling equilibrated after 4 h on-stream and the pervaporation flux remained constant throughout the remainder of testing. The membrane crystallinity was not degraded by p-xylene pervaporation.

Original languageEnglish (US)
Pages (from-to)99-105
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume204
Issue numberC
DOIs
Publication statusPublished - Mar 1 2015

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Keywords

  • Membranes
  • Metal organic framework
  • Permeation
  • Stability
  • Synthesis

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Chemistry(all)
  • Condensed Matter Physics

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