The article reports and discusses the results of a thorough spectroscopic investigation of the self-pulsing electrical discharge in contact with aqueous media. The discharge occurs between a bare high voltage electrode positioned over the liquid and a grounded ring submerged by the liquid. It is supplied with DC high voltage, but it operates in pulse mode that is determined by the charging and discharging of a parallelly connected capacitor. This type of discharge has attracted our attention due to its complex physics, as well as to its high efficiency in inducing the degradation of highly inert hazardous pollutants present in the water, such as perfluoroalkyl substances. The generated discharge unites several types of plasma in a single discharge cell. It starts as a high temperature (2500 K), high electron density (1016–17 cm−3) spark-like discharge close to the high voltage electrode and then branches into a large number of cooler leaders characterized by one order of magnitude lower electron density (1015 cm−3) in the middle of the gap and finally touches the liquid electrode through a dense network of low temperature (500 K) and low electron density streamers (1014 cm−3). The paper discusses the results of a parametric study that has provided temperature and electron density data in different regions of the discharge. The measurements were thus performed for discharges in ambient air, in synthetic air (an 80/20 N2/O2 mixture) and in argon with, as liquid electrode, either tap or ultrapure water containing a small amount of perfluorooctanoic acid.
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14 May 2021
Research Article|
May 14 2021
Spectroscopic study of self-pulsing discharge with liquid electrode
Special Collection:
Plasma-Liquid Interactions
Goran B. Sretenović
;
Goran B. Sretenović
a)
1
Faculty of Physics, University of Belgrade
, PO Box 44, 11001 Belgrade, Serbia
2
Department of Chemical Sciences, University of Padova
, Via Marzolo 1, 35131 Padova, Italy
a)Author to whom correspondence should be addressed: sretenovic@ff.bg.ac.rs
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Mubbshir Saleem
;
Mubbshir Saleem
2
Department of Chemical Sciences, University of Padova
, Via Marzolo 1, 35131 Padova, Italy
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Omar Biondo
;
Omar Biondo
2
Department of Chemical Sciences, University of Padova
, Via Marzolo 1, 35131 Padova, Italy
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Giulia Tomei
;
Giulia Tomei
2
Department of Chemical Sciences, University of Padova
, Via Marzolo 1, 35131 Padova, Italy
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Ester Marotta
;
Ester Marotta
2
Department of Chemical Sciences, University of Padova
, Via Marzolo 1, 35131 Padova, Italy
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Cristina Paradisi
Cristina Paradisi
2
Department of Chemical Sciences, University of Padova
, Via Marzolo 1, 35131 Padova, Italy
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a)Author to whom correspondence should be addressed: sretenovic@ff.bg.ac.rs
Note: This paper is part of the Special Topic on Plasma-Liquid Interactions.
J. Appl. Phys. 129, 183308 (2021)
Article history
Received:
January 15 2021
Accepted:
April 27 2021
Citation
Goran B. Sretenović, Mubbshir Saleem, Omar Biondo, Giulia Tomei, Ester Marotta, Cristina Paradisi; Spectroscopic study of self-pulsing discharge with liquid electrode. J. Appl. Phys. 14 May 2021; 129 (18): 183308. https://doi.org/10.1063/5.0044331
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