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dc.contributor.authorOliveira, Flavio H.-
dc.contributor.authorOsugi, Marly E.-
dc.contributor.authorPaschoal, Fabiana M. M.-
dc.contributor.authorProfeti, Demetrius-
dc.contributor.authorOlivi, Paulo-
dc.contributor.authorZanoni, Maria Valnice Boldrin-
dc.identifier.citationJournal of Applied Electrochemistry. Dordrecht: Springer, v. 37, n. 5, p. 583-592, 2007.-
dc.description.abstractThe generation of active chlorine on Ti/Sn(1-x)Ir (x) O-2 anodes, with different compositions of Ir (x = 0.01, 0.05, 0.10 and 0.30 ), was investigated by controlled current density electrolysis. Using a low concentration of chloride ions (0.05 mol L-1) and a low current density (5 mA cm(-2)) it was possible to produce up to 60 mg L-1 of active chlorine on a Ti/Sn0.99Ir0.01O2 anode. The feasibility of the discoloration of a textile acid azo dye, acid red 29 dye (C.I. 16570), was also investigated with in situ electrogenerated active chlorine on Ti/Sn(1-x)Ir (x) O-2 anodes. The best conditions for 100% discoloration and maximum degradation (70% TOC reduction) were found to be: NaCl pH 4, 25 mA cm(-2) and 6 h of electrolysis. It is suggested that active chlorine generation and/or powerful oxidants such as chlorine radicals and hydroxyl radicals are responsible for promoting faster dye degradation. Rate constants calculated from color decay versus time reveal a zero order reaction at dye concentrations up to 1.0 x 10(-4) mol L-1. Effects of other electrolytes, dye concentration and applied density currents also have been investigated and are discussed.en
dc.sourceWeb of Science-
dc.subjectTi/Sn(1-x)IrxO2 anodespt
dc.subjectdegradation of azo dyept
dc.subjectdye oxidationpt
dc.subjectchlorine generationpt
dc.titleElectrochemical oxidation of an acid dye by active chlorine generated using Ti/Sn(1-x)Ir O-x(2) electrodesen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.description.affiliationUniv Estadual Paulista, Dept Quim Analit, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.description.affiliationUniv São Paulo, Fac Filosofia Ciências & Letras Ribeirao Pret, Dept Quim, BR-14040901 Ribeirao Preto, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Dept Quim Analit, Inst Quim, BR-14801970 Araraquara, SP, Brazil-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Applied Electrochemistry-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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