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Sonochemical Degradation Rates of Volatile Solutes

Colussi, A. J. and Hung, Hui-Ming and Hoffmann, Michael R. (1999) Sonochemical Degradation Rates of Volatile Solutes. Journal of Physical Chemistry A, 103 (15). pp. 2696-2699. ISSN 1089-5639. doi:10.1021/jp984272o.

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We report degradation rates of chlorinated methanes, ethanes, and ethenes -- spanning the range of Henry's law constants 0.9 ≤ H/(atm M^(-1)) ≤ 24.5 -- in water solutions sonicated at f = 205, 358, 618, and 1078 kHz. First-order degradation rate constants, k-X, vary as k_(-X) ∼ H_X^(0.30±0.03) at all frequencies, change with f by less than a factor of 2 in this range, and peak at about 600 kHz for all species. We show that experimental rates are consistent with (1) complete decomposition of the solute contained in collapsing bubbles, (2) about 15% ultrasound power efficiency for transient cavitation, and (3) a rather flat N(R_o) ∝ R_o^n,n ∼ 0, initial radius bubble distribution under continuous sonication. The solute content of collapsing bubbles is composed of the equilibrated vapor at R_o, plus the amount incorporated by diffusion from the surrounding solution during the acoustically driven expansion from R_o to R_(max), the maximum radius attained prior to collapse. The finding that k_(-X)'s decline above 600 kHz is ascribed to the fact that increasingly smaller bubbles collapse at rates reaching a limiting value at sufficiently high frequencies.

Item Type:Article
Related URLs:
URLURL TypeDescription
Colussi, A. J.0000-0002-3400-4101
Hung, Hui-Ming0000-0002-6755-6359
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1999 American Chemical Society. Received: October 29, 1998; In Final Form: February 3, 1999. Financial support for this research was provided by the U.S. Department of Energy (DOE 1 963772 402).
Funding AgencyGrant Number
Department of Energy (DOE)1 963772 402
Issue or Number:15
Record Number:CaltechAUTHORS:20150623-154801093
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Official Citation:Sonochemical Degradation Rates of Volatile Solutes A. J. Colussi, Hui-Ming Hung, and Michael R. Hoffmann The Journal of Physical Chemistry A 1999 103 (15), 2696-2699 DOI: 10.1021/jp984272o
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58496
Deposited By: George Porter
Deposited On:28 Jul 2015 19:34
Last Modified:10 Nov 2021 22:06

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