Fabrication of dual-layer polyethersulfone (PES) hollow fiber membranes with an ultrathin dense-selective layer for gas separation

Yi Li, Chun Cao, Tai-Shung Chung, Kumari P. Pramoda

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

By using co-extrusion and dry-jet wet-spinning phase-inversion techniques with the aid of heat-treatment at 75°C, we have fabricated dual-layer polyethersulfone (PES) hollow fiber membranes with an ultrathin dense-selective layer of 407 Å. To our best knowledge, this is the thinnest thickness that has ever been reported for dual-layer hollow fiber membranes. The dual-layer hollow fibers have an O 2 permeance of 10.8 GPU and O 2/N 2 selectivity of 6.0 at 25°C. The effects of post heat-treatment on the membrane morphology and gas separation performance were also studied. It was found that heat-treatment at 75°C improves the gas permeance and ideal selectivity, while heat-treatment at 150°C results in a significant reduction in both permeance and selectivity due to the enhanced substructure resistance. SEM pictures confirmed that a higher heat-treatment temperature can significantly reduce pore sizes and the amount of pores in the substructure immediately underneath the dense-selective layer.

Original languageEnglish (US)
Pages (from-to)53-60
Number of pages8
JournalJournal of Membrane Science
Volume245
Issue number1-2
DOIs
StatePublished - Dec 1 2004

Keywords

  • Dual-layer hollow fiber membrane
  • Gas separation
  • Heat-treatment
  • Macrovoids
  • Polyethersulfone (PES)
  • Ultrathin dense-selective layer

ASJC Scopus subject areas

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

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