Characterization of the chemical activity of a pulsed corona discharge above water.

Characterization of the chemical activity of a pulsed corona discharge above water.
Chemosphere. 2019 Jul 09;236:124302
Authors: Bilea F, Bradu C, Mandache NB, Magureanu M
Abstract
A pulsed corona discharge above liquid combined with ozonation has been investigated for the degradation of organic pollutants in water, as well as regarding the generation of several oxidizing species: ozone in gas phase, hydrogen peroxide and hydroxyl radicals in the liquid. A considerable improvement in the energy efficiency for organic compounds removal has been observed when reducing the width of the discharge pulses. This finding was correlated with the efficient formation of oxidizing species in case of short pulses. Recycling of the effluent gas from the plasma also enhances contaminants degradation. This was mainly attributed to an in situ peroxone process, i.e. the reaction between plasma-generated O3 and H2O2, forming highly reactive OH radicals, largely responsible for organic compounds degradation. This assumption is supported by the decline in O3 and H2O2 concentrations and simultaneous increase in OH concentration detected in plasma-ozonation experiments as compared to results obtained with plasma alone.
PMID: 31306974 [PubMed - as supplied by publisher]

Source: Chemosphere - July 8, 2019 Category: Chemistry Authors: Bilea F, Bradu C, Mandache NB, Magureanu M Tags: Chemosphere Source Type: research