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A mechanistic study on photocatalysis by thiapyrylium salts. Photodegradationof dimethoate, alachlor and pyrimethanil under simulated sunlight

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A mechanistic study on photocatalysis by thiapyrylium salts. Photodegradationof dimethoate, alachlor and pyrimethanil under simulated sunlight

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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 Marín García, Mª Luisa es_ES
dc.contributor.author Miranda Alonso, Miguel Ángel es_ES
dc.date.accessioned 2014-05-16T17:39:32Z
dc.date.issued 2012-07-23
dc.identifier.issn 0926-3373
dc.identifier.uri http://hdl.handle.net/10251/37530
dc.description.abstract Photodegradation of dimethoate, alachlor, and pyrimethanil using a thiapyrilium salt (TPTP+) as photocatalyst was performed under simulated sunlight. The photocatalyst removes preferentially pyrimethanil (45% after 60 min of irradiation), followed by dimethoate (20%) and alachlor (13%). In the three cases, an important to moderate decrease of the fluorescence intensity upon addition of the pollutants was observed. The active participation of the singlet excited state in the photodegradation of the pollutants was demonstrated; the corresponding dynamic quenching rate constants were found to be 1.9 x 10(10) M-1 s(-1) (pyrimethanil), 6.7 x 10(9) M-1 s(-1) (dimethoate) and 9.1 x 10(9) M-1 s(-1) Moreover, a decrease in the signal corresponding to the triplet excited state was observed immediately after the laser pulse; again a good correlation was observed between the missing fraction of triplets and the photodegradation rates under solar light. Detection of TPT+, the reduced species derived from the photocatalyst, as well as Rehm-Weller calculations on the free energy changes, strongly support an electron transfer mechanism occurring from the singlet excited state. (C) 2012 Published by Elsevier B.V. es_ES
dc.description.sponsorship Financial support from the Spanish Government (CTQ200913699, CTQ2009-13459-C05-03/PPQ and RIRAAF RETICS), and the Generalitat Valenciana (Prometeo Program and ACOM/2011/173) is gratefully acknowledged. en_EN
dc.format.extent 6 es_ES
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation Spanish Government [CTQ200913699 ; CTQ2009-13459-C05-03/PPQ ; RIRAAF RETICS] es_ES
dc.relation Generalitat Valenciana [ACOM/2011/173] es_ES
dc.relation.ispartof Applied Catalysis B: Environmental es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Pesticides es_ES
dc.subject Fluorescence es_ES
dc.subject Laser flash photolysis es_ES
dc.subject Quenching es_ES
dc.subject Singlet excited state es_ES
dc.subject Triplet 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 mechanistic study on photocatalysis by thiapyrylium salts. Photodegradationof dimethoate, alachlor and pyrimethanil under simulated sunlight 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.2012.04.025
dc.rights.accessRights Cerrado 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. Departamento de Química - Departament de Química 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 Gomis Vicens, J.; Arqués Sanz, A.; Amat Payá, AM.; Marín García, ML.; Miranda Alonso, MÁ. (2012). A mechanistic study on photocatalysis by thiapyrylium salts. Photodegradationof dimethoate, alachlor and pyrimethanil under simulated sunlight. Applied Catalysis B: Environmental. 123-124:208-213. doi:10.1016/j.apcatb.2012.04.025 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.apcatb.2012.04.025 es_ES
dc.description.upvformatpinicio 208 es_ES
dc.description.upvformatpfin 213 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 123-124 es_ES
dc.relation.senia 232434


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