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Theoretical and experimental formation of low chlorinated dibenzo-p-dioxins and dibenzofurans in the Fenton oxidation of chlorophenol solutions

Abstract: The formation of chlorinated and non-chlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) has been experimentally investigated after the Fenton oxidation of 2-chlorophenol (2-CP, 15.56 mM) aqueous solutions by assessing the influence of iron concentration (0.09–2.88 mM), hydrogen peroxide dose (40.44–202.20 mM), temperature (20–70 °C) and chloride concentration (0–56.35 mM). The presence of chloride in the medium together with room temperature and substoichiometric Fenton conditions (40.44 mM H2O2) led to an increase in total PCDD/Fs concentration from less than 1 ng L-1 to 2 µg L-1. Results showed a dominance of the dichlorinated species (DCDD/Fs) in the homologue profile of total PCDD/Fs reaching values up to 1.5 µg L-1. Furthermore, the products distribution exhibited a gradual decrease in the homologue concentration as the chlorination degree increased from di-to octachloro-substituted positions. Considering the characteristics of the reaction medium, the experimental results, and the information gathered in bibliography with regard to the generation of active radicals from 2-chlorophenol, a mechanism describing the formation of low chlorinated PCDD/Fs in a Fenton oxidizing aqueous system has been proposed.

 Autoría: Fernández-Castro P., San Román M., Ortiz I.,

 Fuente: Chemosphere, 2016, 161, 136-144

 Editorial: Elsevier

 Fecha de publicación: 01/10/2016

 Nº de páginas: 9

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.chemosphere.2016.07.011

 ISSN: 0045-6535,1879-1298

 Proyecto español: CTM2014-58029-R ; CTQ2015-66078-R

 Url de la publicación: https://doi.org/10.1016/j.chemosphere.2016.07.011