Enhancement of sonochemical oxidation reactions using air sparging in a 36 kHz sonoreactor

Jongbok Choi, Jeehyeong Khim, Bernaurdshaw Neppolian, Younggyu Son

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The effect of air sparging on sonochemical oxidation reactions was investigated using a relatively large reactor equipped with a 36 kHz transducer module at the bottom. KI dosimetry and luminol techniques were used for quantitative and qualitative analysis of the reactions. The cavitation yield increased and then varied minimally as the liquid height increased from 1λ (42 mm) to 8λ (333 mm) with no air sparging. The flow rate of the air used for sparging and the position of the sparger significantly affected the extent of the sonochemical oxidation reactions. A significant enhancement in the sonochemical oxidation by air sparging was observed for higher liquid height and higher flow rate conditions at a constant input power. This enhancement is attributed to the violent mixing effect and the significant change in the sound field and cavitation-active zone in the liquid. Higher sonochemical activity was obtained when air sparging was applied closer to the transducer module at a higher flow rate. Imaging the motion of the liquid surface and sonochemiluminescence revealed that the instability of the liquid body was directly related to the sonochemical activity.

Original languageEnglish
Pages (from-to)412-418
Number of pages7
JournalUltrasonics Sonochemistry
Publication statusPublished - 2019 Mar

Bibliographical note

Funding Information:
This work was supported by the Korea Ministry of Environment (MOE) as “ GAIA (Geo-Advanced Innovative Action)” Program [project No. 2015000560002 ] and “ SEM (Subsurface Environment Management)” Program [project No. 2018002480009 ] and the National Research Foundation of Korea [Grant No. NRF-2018R1D1A1B07048124 ].

Publisher Copyright:
© 2018 Elsevier B.V.


  • Acoustic cavitation
  • Air sparging
  • Cavitation yield
  • KI dosimetry
  • Liquid instability
  • Sonochemiluminescence

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemical Engineering (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Acoustics and Ultrasonics
  • Organic Chemistry
  • Inorganic Chemistry


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