Sonophotocatalytic destruction of chloroform: Comparison of processes and synergistic effects

Beomguk Park, Eunju Cho, Heedeung Park, Jeehyeong Khim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This study compared ultrasound, ultraviolet, and catalyst processes and evaluated their respective synergistic effects. The ultrasonic frequencies in this study used 35, 283, 450, and 935 kHz, whereas short wavelength ultraviolet lamp (UVC) was used. The dose of TiO2 was 0.3g/L. The degradation rate constants for the sonophotolytic processes were (4.2-8.7) × 10 -3min-1, nearly the same for the sonolytic processes. The value of the synergistic effect was 1.07. The main mechanism of this process was pyrolysis by ultrasound. The ultraviolet provided another mechanism as using oxidation by hydroxyl radicals, but the enhancement was not significant. The rate constants of sonophotocatalytic processes were (48.1-64.6) × 10 -3min-1. The calculated value of synergistic effect was 1.54. In this process, the main mechanism for degradation was oxidation by hydroxyl radicals on the surface of TiO2. The roles of the ultrasound were the dispersion of catalyst and mass transport of pollutant to the surface of the catalyst.

Original languageEnglish
Article number07HE10
JournalJapanese journal of applied physics
Volume50
Issue number7 PART 2
DOIs
Publication statusPublished - 2011 Jul

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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