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A photophysical approach to investigate the photooxidation mechanism of pesticides: Hydroxyl radical versus electron transfer

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A photophysical approach to investigate the photooxidation mechanism of pesticides: Hydroxyl radical versus electron transfer

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dc.contributor.author Marín García, Mª Luisa es_ES
dc.contributor.author Lhiaubet, Virginie Lyria es_ES
dc.contributor.author Santos-Juanes Jordá, Lucas es_ES
dc.contributor.author Soler Escoda, Juan Miguel es_ES
dc.contributor.author Gomis Vicens, Juan es_ES
dc.contributor.author Arques Sanz, Antonio es_ES
dc.contributor.author Amat Payá, Ana María es_ES
dc.contributor.author Miranda Alonso, Miguel Ángel es_ES
dc.date.accessioned 2014-05-16T17:16:25Z
dc.date.issued 2011-03-14
dc.identifier.issn 0926-3373
dc.identifier.uri http://hdl.handle.net/10251/37529
dc.description.abstract [EN] The role of hydroxyl radical in different solar photocatalytic processes, namely photo-Fenton, titanium dioxide-based oxidation and organic photocatalysis (triphenylpyrylium) has been investigated. Using a methodology based on the flash photolytic generation of OH. from N-hydroxypyridine-2(1H)-thione, followed by t-stilbene trapping, the reaction rate constants of different pesticides (dimethoate, methidathion, alachlor and pyrimethanyl) with this reactive oxygen species in deaerated acetonitrile have been determined. The results obtained under photo-Fenton conditions are in reasonable agreement with the estimated rate constants; hence the assumption that the photo-Fenton reaction mainly involves participation of the hydroxyl radical seems plausible. The oxidation pattern using titanium dioxide was also investigated; however, under these conditions no clear correlation could be found due to participation of an alternative electron transfer mechanism.Finally, pyrimethanil was the most reactive pesticide when photodegradation was carried out in the presence of TPP, in spite of its low reactivity towards hydroxyl radical. Laser flash photolysis experiments evidenced that the reaction occurs via photoinduced electron transfer within a ground state complex; this is in good correlation with the relative amount of pyranyl radical formation. © 2011 Elsevier B.V. es_ES
dc.description.sponsorship Financial support from the Spanish Government (Projects CTQ2009-13699 and CTQ2009-13459-C05-03) is gratefully acknowledged.
dc.format.extent 6 es_ES
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation MICINN/CTQ2009-13699 es_ES
dc.relation MICINN/CTQ2009-13459-C05-03
dc.relation.ispartof Applied Catalysis B: Environmental es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Hydroxyl radical es_ES
dc.subject Laser flash photolysis es_ES
dc.subject Photo-Fenton es_ES
dc.subject Titanium dioxide es_ES
dc.subject Triphenylpyrylium es_ES
dc.subject Alachlor es_ES
dc.subject Dimethoate es_ES
dc.subject Electron transfer es_ES
dc.subject Good correlations es_ES
dc.subject Hydroxyl radicals es_ES
dc.subject Hydroxypyridine es_ES
dc.subject Methidathion es_ES
dc.subject Photo-Fenton reactions es_ES
dc.subject Photo-induced electron transfer es_ES
dc.subject Photocatalytic process es_ES
dc.subject Photooxidation mechanism es_ES
dc.subject Photophysical es_ES
dc.subject Pyrimethanil es_ES
dc.subject Radical formation es_ES
dc.subject Reactive oxygen species es_ES
dc.subject Acetonitrile es_ES
dc.subject Electron transitions es_ES
dc.subject Oxides es_ES
dc.subject Oxygen es_ES
dc.subject Pesticides es_ES
dc.subject Photocatalysis es_ES
dc.subject Photolysis es_ES
dc.subject Photooxidation es_ES
dc.subject Rate constants es_ES
dc.subject Titanium es_ES
dc.subject Free radical reactions es_ES
dc.subject.classification INGENIERIA TEXTIL Y PAPELERA es_ES
dc.subject.classification QUIMICA ANALITICA es_ES
dc.subject.classification QUIMICA FISICA es_ES
dc.subject.classification QUIMICA ORGANICA es_ES
dc.title A photophysical approach to investigate the photooxidation mechanism of pesticides: Hydroxyl radical versus electron transfer es_ES
dc.type Artículo es_ES
dc.embargo.lift 10000-01-01
dc.embargo.terms forever es_ES
dc.identifier.doi 10.1016/j.apcatb.2011.01.007
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Química - Departament de Química es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Textil y Papelera - Departament d'Enginyeria Tèxtil i Paperera es_ES
dc.contributor.affiliation Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química es_ES
dc.contributor.affiliation Universitat Politècnica de València. Grupo de Procesos de Oxidación Avanzada es_ES
dc.description.bibliographicCitation Marín García, ML.; Lhiaubet, VL.; Santos-Juanes Jordá, L.; Soler Escoda, JM.; Gomis Vicens, J.; Arques Sanz, A.; Amat Payá, AM.... (2011). A photophysical approach to investigate the photooxidation mechanism of pesticides: Hydroxyl radical versus electron transfer. Applied Catalysis B: Environmental. 103(1-2):48-53. https://doi.org/10.1016/j.apcatb.2011.01.007 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.apcatb.2011.01.007 es_ES
dc.description.upvformatpinicio 48 es_ES
dc.description.upvformatpfin 53 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 103 es_ES
dc.description.issue 1-2 es_ES
dc.relation.senia 191846
dc.contributor.funder Ministerio de Ciencia e Innovación


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