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
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/37529
Title:
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A photophysical approach to investigate the photooxidation mechanism of pesticides: Hydroxyl radical versus electron transfer
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Author:
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Marín García, Mª Luisa
Lhiaubet, Virginie Lyria
Santos-Juanes Jordá, Lucas
Soler Escoda, Juan Miguel
Gomis Vicens, Juan
Arques Sanz, Antonio
Amat Payá, Ana María
Miranda Alonso, Miguel Ángel
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UPV Unit:
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Universitat Politècnica de València. Departamento de Química - Departament de Química
Universitat Politècnica de València. Departamento de Ingeniería Textil y Papelera - Departament d'Enginyeria Tèxtil i Paperera
Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química
Universitat Politècnica de València. Grupo de Procesos de Oxidación Avanzada
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Issued date:
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Abstract:
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[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 ...[+]
[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.
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Subjects:
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Hydroxyl radical
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Laser flash photolysis
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Photo-Fenton
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Titanium dioxide
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Triphenylpyrylium
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Alachlor
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Dimethoate
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Electron transfer
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Good correlations
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Hydroxyl radicals
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Hydroxypyridine
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Methidathion
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Photo-Fenton reactions
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Photo-induced electron transfer
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Photocatalytic process
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Photooxidation mechanism
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Photophysical
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Pyrimethanil
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Radical formation
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Reactive oxygen species
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Acetonitrile
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Electron transitions
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Oxides
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Oxygen
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Pesticides
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Photocatalysis
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Photolysis
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Photooxidation
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Rate constants
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Titanium
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Free radical reactions
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Copyrigths:
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Cerrado |
Source:
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Applied Catalysis B: Environmental. (issn:
0926-3373
)
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DOI:
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10.1016/j.apcatb.2011.01.007
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Publisher:
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Elsevier
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Publisher version:
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http://dx.doi.org/10.1016/j.apcatb.2011.01.007
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Project ID:
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info:eu-repo/grantAgreement/MICINN//CTQ2009-13699/ES/MECANISMOS FOTOQUIMICOS DEL DAÑO AL ADN Y SU REPARACION. FOTOSENSIBILIZACION FRENTE A FOTOPROTECCION/
info:eu-repo/grantAgreement/MICINN//CTQ2009-13459-C05-03/ES/Integración de procesos de fotocatálisis solar en la depuración biológica de aguas residuales para la eliminación de contaminantes emergentes (EDARSOL)/
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Thanks:
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Financial support from the Spanish Government (Projects CTQ2009-13699 and CTQ2009-13459-C05-03) is gratefully acknowledged.
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Type:
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Artículo
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