Silver ionic modification in dual-layer hollow fiber membranes with significant enhancement in CO2/CH4 and O2/N2 separation

Yi Li, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The silver ionic modification approach and dual-layer hollow fiber spinning technology synergistically lead to the significantly enhanced O2/N2 and CO2/CH4 selectivity of 9.5 and 118, respectively, with an ultrathin dense-selective layer of 1092 Å in the pure gas measurement. Even with the presence of competition in sorption sites between two penetrants, the dual-layer hollow fiber membrane developed in this work still reveals the superior CO2/CH4 selectivity of 87.9 in the mixed gas measurement. To our best knowledge, this is the first time for the polyethersulfone (PES) material to achieve so high CO2/CH4 selectivity through the ionic modification. The electrostatic crosslinking, steric hindrance and affinity to some specific gases (e.g. O2 and CO2) induced by the incorporation of ionic groups into the PES matrix may be three dominant factors for the advanced gas separation performance in this work.

Original languageEnglish (US)
Pages (from-to)226-231
Number of pages6
JournalJournal of Membrane Science
Issue number1-2
StatePublished - Mar 15 2010


  • Affinity
  • Dual-layer hollow fiber membranes
  • Electrostatic crosslinking
  • Gas separation
  • Silver ionic modification

ASJC Scopus subject areas

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


Dive into the research topics of 'Silver ionic modification in dual-layer hollow fiber membranes with significant enhancement in CO<sub>2</sub>/CH<sub>4</sub> and O<sub>2</sub>/N<sub>2</sub> separation'. Together they form a unique fingerprint.

Cite this