Diagnostic of hydroxyl radical concentration in high pulse voltage triggered dielectric barrier discharges
Conference
·
OSTI ID:20067627
Dielectric barrier discharges (DBDs) are well known to be non-thermal, cold discharges which are used in the treatment of different types of pollutants such as volatile organic compounds (VOCs) or flue gases. The hydroxyl radical ({sup {sm_bullet}}OH) is a very efficient oxidant species and represents an important agent in the pollutant remediation. An estimation of potentialities of depollution processes involve notably a good knowledge of the hydroxyl concentration and its time evolution. Classically the {sup {sm_bullet}}OH concentration measurements are realized by LIF principally in the earth atmosphere and in flames. This technique seems not to be very well adapted to filamentary DBD plasmas and represents a rather expensive investment. The authors have developed a diagnostic of absolute concentration measurement based on a time resolved resonant absorption spectroscopy. This diagnostic has been tested first in argon + water vapor mixtures. Various effects of discharge parameters like input energy or water vapor concentration on the {sup {sm_bullet}}OH(X) density have been clarified. Next more practical gas mixtures like air + water vapor + pollutant (TCE) mixtures have been investigated. The temporal decay of {sup {sm_bullet}}OH(X) radical concentration with and without TCE has been studied. The decay frequency of {sup {sm_bullet}}OH(X) is in good agreement with the literature data and allows to valid this diagnostic.
- Research Organization:
- Univ. of Orleans (FR)
- OSTI ID:
- 20067627
- Country of Publication:
- United States
- Language:
- English
Similar Records
Formation of hydroxyl radical ({sup {sm_bullet}}OH) in illuminated surface waters contaminated with acidic mine drainage
The influence of ultraviolet illumination on OH formation in dielectric barrier discharges of Ar/O{sub 2}/H{sub 2}O: The Joshi effect
Nitrate-induced photolysis in natural waters: Controls on concentrations of hydroxyl radical photo-intermediates by natural scavenging agents
Journal Article
·
Wed Jan 31 23:00:00 EST 1996
· Environmental Toxicology and Chemistry
·
OSTI ID:201248
The influence of ultraviolet illumination on OH formation in dielectric barrier discharges of Ar/O{sub 2}/H{sub 2}O: The Joshi effect
Journal Article
·
Sun Jun 01 00:00:00 EDT 1997
· Journal of Applied Physics
·
OSTI ID:503586
Nitrate-induced photolysis in natural waters: Controls on concentrations of hydroxyl radical photo-intermediates by natural scavenging agents
Journal Article
·
Thu Oct 01 00:00:00 EDT 1998
· Environmental Science and Technology
·
OSTI ID:658976