NDLI: Effect of solution conductivity on H production by pulsed corona discharge in water

Content Provider	IEEE Xplore Digital Library
Author	Lukes, P. Clupek, M. Babicky, V. Sunka, P. Tothova, I. Janda, V.
Copyright Year	2008
Description	Author affiliation: Inst. of Plasma Phys. AS CR, Prague (Lukes, P.; Clupek, M.; Babicky, V.; Sunka, P.)
Abstract	Non-equilibrium plasma generated by electrical discharges in liquids initiate various chemical and physical processes that can be potentially utilized in different environmental, biological or medical applications. These processes include high electric field, ultraviolet radiation, overpressure shock waves and, of particular importance, formation of various reactive chemical species such as radicals (OH, H, O) and molecular species $(H_{2}O_{2},$ $H_{2},$ $O_{3}),$ among which OH radicals and hydrogen peroxide are the most important for oxidation processes. The magnitude of the contributions of the individual effects in the decontamination or microbial inactivation processes strongly depends upon the energy of the discharge and also on the solution conductivity. An increase in the solution conductivity is connected with a higher concentration of ions in the liquid, which strongly alter the propagation of the streamer channel in water by compensating the space charge electric field on the streamer head. Thus, higher conductivity results, on the one hand, in a larger discharge current due to lower resistivity of liquid media, and, on the other hand, in a shortening of the streamer channel length due to faster compensation of space charge electric field on the streamer head by ions in the liquid. This results in a higher power density in the discharge channel and a higher plasma temperature and higher UV radiation. Hydrogen peroxide as the most abundant chemical species directly produced by the discharge in water is often utilized in Fenton's reaction to increase the plasmachemical efficiency of the removal of organic compounds by addition of ferrous salts into treated water. There is also evidence about contribution of $H_{2}O_{2}$ in bacterial inactivation by electrical discharge in water. In the present study, the role of solution conductivity in the hydrogen peroxide production by the pulsed corona discharge in water generated using point to plane geometry of electrodes is investigated. The free radical scavenging property of DMSO and phenol is used to determine the initial rate of formation of $H_{2}O_{2}$ by the pulsed corona discharge. The influence of UV radiation of the discharge and the effect of $H_{2}$ and $O_{2}$ on the production of hydrogen peroxide will be discussed.
Starting Page	1
Ending Page	1
File Size	32872
Page Count	1
File Format	PDF
ISBN	9781424419296
ISSN	07309244
DOI	10.1109/PLASMA.2008.4591150
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-15
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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