Triclosan breakdown by Fenton-like oxidation
Entity
UAM. Departamento de Química Física AplicadaPublisher
Elsevier B.V.Date
2012-08-01Citation
10.1016/j.cej.2012.05.097
Chemical Engineering Journal 198-199 (2012): 275-281
ISSN
1385-8947DOI
10.1016/j.cej.2012.05.097Funded by
This research has been supported by the Spanish MICINN through the project CTQ2008-03988 and by the CM through the project S-2009/AMB-1588Project
Gobierno de España. CTQ2008-03988; Comunidad de Madrid. S-2009/AMB-1588/REMTAVARESEditor's Version
http://dx.doi.org/10.1016/j.cej.2012.05.097Subjects
Advanced oxidation; Ecotoxicity; Emerging pollutants; Fenton-like process; Triclosan; QuímicaAbstract
Fenton-like oxidation has proved to be highly efficient for the removal of triclosan, a highly toxic emerging water pollutant. From 10mg/L starting aqueous solutions complete conversion of triclosan was achieved in less than 1h at 25°C and around 20min at 50°C with 1mg/L Fe3+ and H2O2 at the theoretical stoichiometric amount (25mg/L). From the evolution of byproducts a reaction pathway has been proposed according to which oxidation of triclosan gives rise to several aromatic intermediates (mainly, p-hydroquinone of triclosan and 2,4-dichlorophenol) which evolve to short-chain organic acids. These compounds are mineralized except oxalic acid. A dramatic decrease of ecotoxicity was achieved in a relatively short time (more than 95% in 15min at 35°C). The evolution of ecotoxicity is intimately related to the disappearance of triclosan, much more toxic than the aromatic oxidation intermediates. This disappearance was successfully described by a simple pseudo-first order rate equation with an apparent activation energy value close to 27kJ/mol. The apparent rate constant at 25°C was several orders of magnitude higher than the reported in the literature for other chlorophenolic compounds indicating a higher susceptibility of triclosan to OH radical attack
Files in this item
Google Scholar:Muñoz, Macarena
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Martínez de Pedro, Zahara
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Casas de Pedro, José Antonio
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Rodríguez Jiménez, Juan José
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