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

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

Research output: Contribution to journalArticle

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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

Fingerprint

gas transport
Transport properties
transport properties
Gases
membranes
Membranes
synthesis
Carbon Monoxide
Permeation
Pervaporation
Molecules
inoculation
organic compounds
Adsorption isotherms
Organic compounds
Adsorption
diffusivity
molecules
molecular weight
isotherms

Keywords

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

ASJC Scopus subject areas

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

Cite this

Synthesis, characterization and gas transport properties of MOF-5 membranes. / Zhao, Zhenxia; Ma, Xiaoli; Li, Zhong; Lin, Y. S.

In: Journal of Membrane Science, Vol. 382, No. 1-2, 15.10.2011, p. 82-90.

Research output: Contribution to journalArticle

Zhao, Zhenxia ; Ma, Xiaoli ; Li, Zhong ; Lin, Y. S. / Synthesis, characterization and gas transport properties of MOF-5 membranes. In: Journal of Membrane Science. 2011 ; Vol. 382, No. 1-2. pp. 82-90.
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