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Kinetic and mechanistic analysis of azo dyes decolorization by ZVI-assisted Fenton systems: pH-dependent shift in the contributions of reductive and oxidative transformation pathways

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Kinetic and mechanistic analysis of azo dyes decolorization by ZVI-assisted Fenton systems: pH-dependent shift in the contributions of reductive and oxidative transformation pathways

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dc.contributor.author Donadelli, Jorge A. es_ES
dc.contributor.author Carlos, Luciano es_ES
dc.contributor.author Arqués Sanz, Antonio es_ES
dc.contributor.author Garcia Einschlag, Fernando S. es_ES
dc.date.accessioned 2019-03-01T13:33:49Z
dc.date.available 2019-03-01T13:33:49Z
dc.date.issued 2018 es_ES
dc.identifier.issn 0926-3373 es_ES
dc.identifier.uri http://hdl.handle.net/10251/117534
dc.description.abstract [EN] The chemical decolorization of the azo-dye Acid Black 1 (AB1) by ZVI-assisted Fenton systems was investigated for assessing the relative importance of reductive and oxidative pathways. To this end, system evolution was followed by UV-vis, HPLC, CG-MS, TOC and toxicity measurements. The effects of reaction conditions including initial pH, oxidants (O-2 and H2O2) concentrations, ZVI loading, and the presence of SO42- were studied. Mechanistic issues were addressed by following H2O2, Fe(II), Fe(III) and pH profiles, as well as by performing experiments in the presence of iron-complexing agents (o-phenanthroline and EDTA) or reactive species scavengers (2-propanol and DMSO). Results show that AB1 reduction occurs through heterogeneous processes with moderate to low pH dependent rates, whereas AB1 oxidation is ruled by the Fenton reaction with significantly pH dependent rates. Mechanistic studies demonstrated that AB1 decolorization in ZVI-assisted Fenton systems involves both oxidative and reductive pathways, whose relative contributions significantly change as the initial pH is raised from 3 to 5. In acidic media, AB1 is mostly transformed by oxidative pathways linked to H2O2 consumption. In contrast, in circumneutral media, a rather inefficient H2O2 consumption leads to similar contributions of oxidative and reductive AB1 transformation pathways. A detailed analysis of the pH dependence of the key reactions involved suggests that the overall system behavior is ruled by a shift in the oxidation mechanism of Fe(II) species, as a consequence of the development of a thigh corrosion layer onto ZVI particles at circumneutral pH values. es_ES
dc.description.sponsorship The present work was partially supported by UNLP (11/X679), ANPCyT (PICT-2012-0423, PICT-2015-0374) and CONICET (PIP: 12-2013-01-00236CO). Authors also want to acknowledge the economic support of European Union Call: (H2020-MSCA-RISE-2014, Proyect 645551 (MAT4TREAT). A. Argues and L. Carlos want to acknowledge Spanish Ministerio de Economia y Competividad (CTQ2015-69832, Triceratops Project). A. Donadelli thank the CONICET for his research graduate grant. L. Carlos and F. S. Garcia Einschlag are research members of CONICET. es_ES
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof Applied Catalysis B Environmental es_ES
dc.rights Reconocimiento - No comercial - Sin obra derivada (by-nc-nd) es_ES
dc.subject ZVI-assisted Fenton es_ES
dc.subject Azo Dyes es_ES
dc.subject PH dependent mechanism es_ES
dc.subject Advanced oxidation processes es_ES
dc.subject Wastewater treatment es_ES
dc.subject.classification QUIMICA FISICA es_ES
dc.title Kinetic and mechanistic analysis of azo dyes decolorization by ZVI-assisted Fenton systems: pH-dependent shift in the contributions of reductive and oxidative transformation pathways es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.apcatb.2018.02.057 es_ES
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/645551/EU/Enhancing water quality by developing novel materials for organic pollutant removal in tertiary water treatments/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/UNLP//11%2FX679/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/ANPCyT//PICT-2012-0423/AR/Búsqueda de las bases moleculares en los procesos mutagénicos, fototóxicos y fotogenotóxicos donde participan las beta-carbolina/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/ANPCyT//PICT-2015-0374/AR/Estudio de los efectos fototóxicos y fotogenotóxicos inducidos por b-carbolinas libres o conjugadas. Bases moleculares de los pr/ es_ES
dc.relation.projectID info:eu-repo/grantAgreement/CONICET//PIP 11220130100236CO/
dc.relation.projectID info:eu-repo/grantAgreement/MINECO//CTQ2015-69832-C4-4-R/ES/TECNOLOGIAS EFICIENTES PARA LA ELIMINACION DE CONTAMINANTES DE PREOCUPACION EMERGENTE, CONTENIDOS EN DIRECTIVA 2013%2F39%2FCE O DE RIESGO SIGNIFICATIVO SEGUN DIRECTIVA 2008%2F105%2FCE/
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Textil y Papelera - Departament d'Enginyeria Tèxtil i Paperera es_ES
dc.description.bibliographicCitation Donadelli, JA.; Carlos, L.; Arqués Sanz, A.; Garcia Einschlag, FS. (2018). Kinetic and mechanistic analysis of azo dyes decolorization by ZVI-assisted Fenton systems: pH-dependent shift in the contributions of reductive and oxidative transformation pathways. Applied Catalysis B Environmental. 231:51-61. https://doi.org/10.1016/j.apcatb.2018.02.057 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://doi.org/10.1016/j.apcatb.2018.02.057 es_ES
dc.description.upvformatpinicio 51 es_ES
dc.description.upvformatpfin 61 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 231 es_ES
dc.relation.pasarela S\368756 es_ES
dc.contributor.funder Universidad Nacional de La Plata, Argentina es_ES
dc.contributor.funder Agencia Nacional de Promoción Científica y Tecnológica, Argentina es_ES
dc.contributor.funder Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina es_ES
dc.contributor.funder Ministerio de Economía y Competitividad


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