Bicarbonate Effect in the Ozone-UV Process in the Presence of Nitrate

Ozonation and advanced oxidation processes (AOP) are very efficient methods for the destruction of refractory organic matters. These virtues have always been related to the production of hydroxyl radicals HO * , which are extremely powerful and non-selective oxidants. In this study, the O 3 -UV proc...

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Bibliographic Details
Published in:Ozone: science & engineering 2013-07, Vol.35 (4), p.302-307
Main Authors: El Hachemi, M. Errachid, Naffrechoux, Emmanuel, Suptil, Joël, Hausler, Robert
Format: Article
Language:English
Subjects:
AOP
Applied sciences
Bicarbonate
Bicarbonates
Chemical Sciences
Environmental Sciences
Exact sciences and technology
Hydroxyl Radical
Hydroxyl radicals
Nitrate
Nitrates
Oxidants
Oxidation
Oxidizing agents
Ozone
Peroxynitrite
Pollution
Radicals
Refractory Matters
Scavenger
Ultraviolet
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Summary:Ozonation and advanced oxidation processes (AOP) are very efficient methods for the destruction of refractory organic matters. These virtues have always been related to the production of hydroxyl radicals HO * , which are extremely powerful and non-selective oxidants. In this study, the O 3 -UV process is used as an AOP, where hydroxyl radicals are generated from the photodecomposition of ozone by short wavelength ultraviolet radiation. The obtained results indicated a weak scavenging effect of tert-butanol proving that hydroxyl radicals and ozone are not the only oxidants existing in the medium. Moreover, bicarbonate, known for a long time as effective HO * radical scavengers, does not slow down the oxidation of benzoic acid, but surprisingly increases it. Chlorides significantly decrease the degradation of organic compounds through their reaction with HO * radicals to produce chlorine. Carbonate radicals, nitrate and nitrogenated species as peroxynitrite/ peroxynitrous acid are involved in the oxidative mechanisms.
ISSN:0191-9512
1547-6545
DOI:10.1080/01919512.2013.794650