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Detection of HO2•/O2•- Radicals Formed in Aqueous Solutions Irradiated with Megasonic Waves Using a Cavitation Threshold (CT) Cell Set-Up

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Abstract:

Acoustic cavitation, especially transient cavitation, in solutions is accompanied by a number of physical and chemical effects. Due to high temperature and pressure conditions inside bubbles at their collapse, excitation of various species as well as formation of radicals occurs in solution [1-4]. Water molecules excited by megasonic irradiation typically dissociate to hydrogen and hydroxyl radicals (H• and OH•) [5]. The hydroxyl radical is a strong oxidant while the hydrogen radical has reducing properties. In presence of O2 in the solution, H• reacts with O2 to form hydroperoxyl (HO2•) radicals, which act as a reducing as well as a (weak) oxidizing agent [6]. Dissociation of hydroperoxyl radicals result in the formation of superoxide anion radicals (O2•-) as follows [6]:

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Periodical:

Solid State Phenomena (Volume 219)

Pages:

170-173

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.219.170

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Online since:

September 2014

Authors:

Zhen Xing Han, Bing Wu, Ian Brown, Mark Beck, Srini Raghavan*

Keywords:

Chemiluminescence (CL), CT Cell, Hydroperoxyl Radicals, MCLA, Megasonics

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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DOI: 10.1149/2.019401jss

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