Enhanced sonochemical degradation of perfluorooctanoic acid by sulfate ions

Jo Chen Lin, Shang Lien Lo, Ching Yao Hu, Yu Chi Lee, Jeff Kuo

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39 Citations (Scopus)

Abstract

This study investigated the effects of sulfate ions on the decomposition of perfluorooctanoic acid (PFOA) by ultrasonic (US) irradiation at various pHs, sulfate doses, powers and temperatures. The removal of PFOA was augmented with an increased sulfate ion concentration, with PFOA being almost completely decomposed in 90 min at 25 °C with a sulfate dose of 117 mM. The two major mechanisms in the sulfate-assisted sonochemical system are the direct destruction of PFOA by cavitation and the indirect destruction of PFOA by sulfate free radicals. The decomposition of PFOA followed pseudo-first-order kinetics and was not influenced by pH. The reaction rate constants decreased with increases in temperature due to decreases in the surface tension of the solution.

Original languageEnglish
Pages (from-to)542-547
Number of pages6
JournalUltrasonics Sonochemistry
Volume22
DOIs
Publication statusPublished - 2015

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Keywords

  • Defluorination
  • Perfluorooctanoic acid
  • Sonochemical
  • Sulfate ion
  • Surface tension
  • Ultrasonic

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Acoustics and Ultrasonics
  • Radiology Nuclear Medicine and imaging

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