Synergistic effect of microwave plasma and ultrasonic wave on decomposition of organic compounds in water

To improve the decomposition efficiency of organic compounds dissolved in water, an ultrasonic wave was synchronously superposed to a microwave plasma produced under water. By changing the phase difference between the microwave plasma pulse and the ultrasonic wave, enhancement of OH emission in the...

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Published inJapanese Journal of Applied Physics Vol. 53; no. 7S; pp. 7 - 1-07KE01-5
Main Authors Takahashi, Tomohiro, Takada, Noriharu, Toyoda, Hirotaka
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.07.2014
Subjects
Decomposition
Emissions control
Microwave plasmas
Microwaves
Organic compounds
Plasma (physics)
Radicals
Synergistic effect
Time measurements
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Summary:To improve the decomposition efficiency of organic compounds dissolved in water, an ultrasonic wave was synchronously superposed to a microwave plasma produced under water. By changing the phase difference between the microwave plasma pulse and the ultrasonic wave, enhancement of OH emission in the plasma as well as enhancement of organic decomposition was observed when the pulsed plasma was ignited at a phase of instantaneous reduced pressure induced by the ultrasonic wave. This result suggests that the ultrasonic power can enhance OH radical formation by choosing the timing of the synchronously-injected pulsed microwave power. The decomposition rate from the viewpoint of energy efficiency was about four times larger with the ultrasonic wave superposition compared with the case of ordinary microwave plasma treatment without the ultrasonic superposition.
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ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.53.07KE01