Evolution of a polysulfone nanofiltration membrane following ion beam irradiation

Rama Chennamsetty, Isabel Escobar

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Ion beam irradiation was used to modify the surface of a sulfonated polysulfone water treatment membrane. A beam of 25 keV H+ ions with four irradiation fluences (1 × 1013, 5 × 1013, 1 × 1014, and 5 × 1014 ions/cm2) was used to study the effects of ion beam irradiation on chemical structure, surface morphology, microstructure, and performance. XPS and ATR-FTIR analyses were performed on the virgin and irradiated membranes in order to determine the changes to chemical structure incurred by ion beam irradiation. The results showed that some sulfonic and C-H bonds were broken and new C-S bonds were formed after irradiation. AFM analysis showed that the roughness of the membranes decreased after irradiation, and the decrease in surface roughness was proportional to the increase in irradiation fluence. An increase in flux after ion beam irradiation was also observed along with a smaller flux decline during operation. Flux was not a function of irradiation fluence. Hydrophobicity, pore size distribution, and membrane rejection efficiencies were not affected by ion beam irradiation. Overall, irradiation led to an improvement in membrane performance.

Original languageEnglish
Pages (from-to)5569-5579
Number of pages11
JournalLangmuir
Volume24
Issue number10
DOIs
StatePublished - May 20 2008

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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