Traitement du paracétamol en milieux aqueux par plasma non thermique

Abstract : This study is about the paracetamol degradation in water by using Dielectric Barrier Discharges Non Thermal Plasmas (NTP). NTP are well known to produce oxidizing species (like O, O3 in gas phase and OH ● radicals in liquid phase) whom react with persistent pollutants which are not efficiently degraded with conventional processes. Effects of the operating conditions such as electrical parameters to produce the plasma (frequency, applied high-voltage, consumed power) and inlet gas composition on the paracetamol conversion and produced species are studied. High conversion rates can be reached (higher than 80%) with energy costs up to 42 g/kWh. We show that the efficiency of the implemented process highly depends on the morphology of the discharges above the liquid and the gas composition injected in the discharges. Without oxygen in the inlet gas, the oxidizing species produced in the liquid by water dissociation under plasma effect are not efficient to remove the pollutant. In this work, the generated species in liquid phase have been determined by High-Resolution Mass Spectrometry (HRMS).The main produced species are nitrogen compounds (nitrites and nitrates), carboxylic acids and aromatic degradation of paracetamol. The generated species depend on with the composition of the injected gas in absence of nitrogen in the inlet gas.
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Submitted on : Monday, July 4, 2016 - 9:42:45 AM
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Olivier Aubry, Yasmine Baloul, Hervé Rabat, Cyril Colas, Benoît Maunit, et al.. Traitement du paracétamol en milieux aqueux par plasma non thermique. Colloque "Polluants émergents, de nouveaux défis pour la gestion des eaux souterraines", May 2016, Orléans, France. ⟨hal-01340793⟩

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