Photo-Fenton degradation of the herbicide tebuthiuron under solar irradiation: Iron complexation and initial intermediates

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorSilva, Milady R. A.
dc.creatorVilegas, Wagner
dc.creatorZanoni, Maria Valnice Boldrin
dc.creatorPupo Nogueira, Raquel F.
dc.date2014-05-20T14:19:22Z
dc.date2016-10-25T17:41:03Z
dc.date2014-05-20T14:19:22Z
dc.date2016-10-25T17:41:03Z
dc.date2010-06-01
dc.date.accessioned2017-04-05T22:31:10Z
dc.date.available2017-04-05T22:31:10Z
dc.identifierWater Research. Oxford: Pergamon-Elsevier B.V. Ltd, v. 44, n. 12, p. 3745-3753, 2010.
dc.identifier0043-1354
dc.identifierhttp://hdl.handle.net/11449/25844
dc.identifierhttp://acervodigital.unesp.br/handle/11449/25844
dc.identifier10.1016/j.watres.2010.04.025
dc.identifierWOS:000279382500022
dc.identifier0000-0002-2296-1393
dc.identifierhttp://dx.doi.org/10.1016/j.watres.2010.04.025
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/870683
dc.descriptionThe complexation of iron ions with the herbicide tebuthiuron (TBH), during a solar photo-Fenton process, was investigated using cyclic voltammetry with a glassy carbon electrode. An oxidation peak was observed at +0.64 V after addition of Fe(NO(3))(3) to TBH solution, indicating the formation of a Fe-TBH complex, which was not observed in the presence of ferrioxalate or citrate complexes. This complexation hinders photoreduction of Fe(III), and consequently TBH degradation. The main degradation route, in the presence or absence of citric acid (in the latter case with Fe(NO(3))(3) only), is initiated by the hydroxylation of a terminal methyl group of the urea, indicating an identical degradation mechanism. Hydroxylation of the central methyl of urea, and of the tert-butyl group, was also observed after extended irradiation periods in the presence of citric acid, but was not observed in the presence of Fe(NO(3))(3), due to a slower degradation rate in the absence of the citrate complex. No intermediate, generated from opening of the thiadiazole ring, was identified under the various different conditions. (C) 2010 Elsevier Ltd. All rights reserved.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherPergamon-Elsevier B.V. Ltd
dc.relationWater Research
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectIron complex
dc.subjectLC-MS
dc.subjectIntermediates
dc.subjectVoltammetry
dc.titlePhoto-Fenton degradation of the herbicide tebuthiuron under solar irradiation: Iron complexation and initial intermediates
dc.typeOtro


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