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The Chemical Effects of Collapsing Cavitation Bubbles

Kotronarou, Anastassia and Hoffmann, Michael R. (1995) The Chemical Effects of Collapsing Cavitation Bubbles. In: Aquatic Chemistry. Advances in Chemistry. No.244. American Chemical Society , Washington, DC, pp. 233-251. ISBN 9780841229211.

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A comprehensive mechanism is developed for aqueous-phase oxidation of S(-II), where [S(-II)] = [H_2S] + [HS^-] + [S^(2-)], by ·OH radical in the presence of oxygen. The oxidation of S(-II) is initiated by reaction with ·OH, but it is further propagated by a free-radical chain sequence involving O_2. This mechanism can adequately model the observed oxidation of S(-II) in air-saturated aqueous solutions sonicated at 20 kHz and 75 W/cm^2 at pH ≥ 10, assuming a continuous and uniform ·OH input into solution from the imploding cavitation bubbles. At this pH range, practically all S(-II) is present in the form of HS^- and cannot undergo thermal decomposition. Our work suggests that the use of simplified approaches for modeling the liquid-phase sonochemistry of a well-mixed solution may be justified when ·OH radical reactions predominate. For the immersion probe at 20 kHz and 75 W/cm^2, the effective ·OH uniform release into the bulk solution was estimated to be 3.5 μM/min with a corresponding steady-state ·OH concentration of ≤0.1 μM.

Item Type:Book Section
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Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1995 American Chemical Society. Received for review October 23, 1992. Accepted revised manuscript June 11, 1993. Many are grateful to German Mills for useful and stimulating discussions, This work was funded in part by U.S. Environmental Protection Agency (Exploratory Research Office Grant R815041-01-0) and the Advanced Research Projects Agency (DoD-ONR Grant N0014-92-J-1901).
Funding AgencyGrant Number
Environmental Protection Agency (EPA)R815041-01-0
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Office of Naval Research (ONR)N0014-92-J-1901
Series Name:Advances in Chemistry
Issue or Number:244
Record Number:CaltechAUTHORS:20150824-080258610
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Official Citation:The Chemical Effects of Collapsing Cavitation Bubbles Anatassia Kotronarou and Michael R. Hoffmann Aquatic Chemistry. May 5, 1995, 233-251 DOI:10.1021/ba-1995-0244.ch012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59827
Deposited By: Ruth Sustaita
Deposited On:24 Aug 2015 16:10
Last Modified:10 Nov 2021 22:25

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