Mechanism of OH radical production from ozone bubbles in water after stopping cavitation

•Mechanism of OH radical formation after stopping cavitation is numerically studied.•OH radicals are produced by the reaction of H2O2 and O3 in the liquid.•In acidic conditions, the reaction of H2O2 and O3 in the liquid is relatively slow.•OH radical production is negligible from a dissolving ozone...

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Bibliographic Details
Published in:Ultrasonics sonochemistry 2019-11, Vol.58, p.104707-104707, Article 104707
Main Authors: Yasui, Kyuichi, Tuziuti, Toru, Kanematsu, Wataru
Format: Article
Language:English
Subjects:
25 Chemical reactions
After stopping cavitation
Numerical simulation
OH radical
Oxygen microbubble
Ozone microbubble
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Summary:•Mechanism of OH radical formation after stopping cavitation is numerically studied.•OH radicals are produced by the reaction of H2O2 and O3 in the liquid.•In acidic conditions, the reaction of H2O2 and O3 in the liquid is relatively slow.•OH radical production is negligible from a dissolving ozone bubble. It has been experimentally reported that OH radicals are produced from ozone microbubbles even after stopping cavitation. Microbubbles are mostly produced using acoustic or hydrodynamic cavitation. In the present paper, numerical simulations of chemical reactions inside an ozone bubble and an oxygen bubble are performed during and after acoustic cavitation in order to study the mechanism of OH radical production. The results have indicated that less than one molecule of OH radicals is produced from a dissolving ozone bubble after stopping cavitation when local pH near the bubble wall is
ISSN:1350-4177
1873-2828
DOI:10.1016/j.ultsonch.2019.104707