Synthesis, characterization and gas transport properties of MOF-5 membranes

Zhenxia Zhao, Xiaoli Ma, Zhong Li, Y. S. Lin

Research output: Contribution to journalArticle

81 Scopus citations

Abstract

Continuous and crake-free MOF-5 membranes of about 14μm in thickness were prepared by seeding size-reduced MOF-5 crystals followed by the secondary growth synthesis. The membrane quality was examined by a molecule probing method using a series of organic compounds with sizes ranging from 0.56nm to 1.4nm. Negligible pervaporation flux (1.39×10 -6mol/m 2/s) of 2-dicyclohexylphosphino-2'-(N, N-dimethylamino) biphenyl through the MOF-5 membrane shows absence of the defects larger than the MOF-5 crystalline pores in the MOF-5 membranes. The gas permeance for the MOF-5 membranes, under conditions of T=298-374K, p f=270kPa and p p=101kPa, decreases with increasing molecular weight of the molecules in the order of H 2>He>CO∼N 2>CO 2>SF 6, showing a diffusion-dominating permeation mechanism for the MOF-5 membranes. CO 2 permeation data for the MOF-5 membranes were analyzed by a permeation model with the input of the adsorption isotherm data to obtain more reliable CO 2 diffusivity data in MOF-5, which is in the order of 1×10 -9m 2/s with activation energy for diffusion of about 14.8kJ/mol.

Original languageEnglish (US)
Pages (from-to)82-90
Number of pages9
JournalJournal of Membrane Science
Volume382
Issue number1-2
DOIs
StatePublished - Oct 15 2011

Keywords

  • Gas permeation, diffusion
  • MOF-5 membrane
  • Metal-organic frameworks
  • Molecular probing tests

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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