Sonochemical decomposition of organic acids in aqueous solution: understanding of molecular behavior during cavitation by the analysis of a heterogeneous reaction kinetics model

Ultrasonics Sonochemistry
Kenji OkitsuHiroshi Bandow

Abstract

The sonochemical decomposition of a low concentration of butyric acid was performed in an aqueous solution by use of 200 kHz ultrasound to discuss the reaction kinetics and molecular behavior during cavitation. Taking into account a Langmuir-type adsorption model, we propose a heterogeneous reaction kinetics model, which is based on the local reaction zone at the interface region of the cavitation bubbles, where the adsorption and desorption of butyric acid molecules from the bulk solution occur during bubble oscillation and then the existing molecules inside the local reaction zone are finally decomposed. To confirm our proposed kinetics model, the rates of decomposition were investigated as a function of the initial concentration of butyric acids in the different pH solutions. It was confirmed that our model could be reasonably applied to explain the obtained results and the pseudo rate constant (k) and the equilibrium constant (K) were able to be calculated: k is 8.0 microM min(-1) (pH 2) and 3.5 microM min(-1) (pH 10), and K is 5.7 x 10(-3) microM(-1) (pH 2) and 8.0 x 10(-3) microM(-1) (pH 10), respectively. By the analysis of the obtained K values, it was clear that the ionized organic acid molecules are relatively difficu...Continue Reading

References

Jul 26, 2000·Ultrasonics Sonochemistry·Y NagataY Maeda
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Aug 1, 2006·Ultrasonics·Shin-ichi HatanakaShigeo Hayashi

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Citations

Feb 4, 2014·Ultrasonics Sonochemistry·Limin SongDonglan Sun
Apr 29, 2014·Ultrasonics Sonochemistry·Erica VillaroelRicardo A Torres-Palma
Jul 30, 2014·Ultrasonics Sonochemistry·Paola Villegas-GuzmanRicardo A Torres-Palma
Sep 14, 2013·Journal of Environmental Management·Meral Dükkancı, Gönül Gündüz
Jul 24, 2012·Ultrasonics Sonochemistry·N Ghows, M H Entezari
Jan 18, 2011·Ultrasonics Sonochemistry·Mahdi ChihaNicolas Gondrexon
Jul 16, 2010·Ultrasonics Sonochemistry·Evelien De BelJo Dewulf
Jul 19, 2015·Ultrasonics Sonochemistry·Zhilin WuWeixin Li
Apr 15, 2010·Ultrasonics Sonochemistry·Mahdi ChihaChristian Pétrier
Mar 1, 2012·Ultrasonics Sonochemistry·Louis J Kirschenbaum, Peter Riesz
Apr 22, 2020·Ultrasonics Sonochemistry·Sambandam AnandanMuthupandian Ashokkumar

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