Electrodes based on zeolites modified with cobalt and/or molybdenum for pesticide degradation: part II-2,4,6-trichlorophenol degradation

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dc.contributor.authorCastro, Jorge
dc.contributor.authorFernandez, Francisco
dc.contributor.authorOlivares, Felipe
dc.contributor.authorBerrios, Cristhian
dc.contributor.authorGarrido-Ramirez, Elizabeth
dc.contributor.authorBlanco, Elodie
dc.contributor.authorEscalona, Nestor
dc.contributor.authorAspee, Alexis
dc.contributor.authorBarrias, Pablo
dc.contributor.authorSoledad Ureta-Zanartu, M.
dc.date.accessioned2025-01-20T23:56:22Z
dc.date.available2025-01-20T23:56:22Z
dc.date.issued2021
dc.description.abstract2,4,6-trichlorophenol (TCP) is a persistent pollutant introduced in water by industrial processes and pesticides. We have studied the electrooxidation of TCP on glassy carbon (GC) electrodes drop-coated with a suspension containing Mo- and/or Co-modified zeolite, graphite, and Nafion (R) perfluorinated ion-exchange resin in distilled water. Three zeolites, Linde type A (ZA), Faujasite (ZY) and MFI (ZSM-5), of different hydrophilic/hydrophobic character, were modified with molybdenum and/or cobalt by the wet impregnation method and characterized by Fourier-transform infrared spectroscopy with attenuated total reflection and temperature programmed reduction. The electrochemical study included cyclic voltammetry, electrochemical impedance spectroscopy, and electrolysis at controlled potential. High performance liquid chromatography and mass spectrometry allowed detecting the following reaction products: 2,6-dichloro-1,4-benzoquinone, 2,6-dichloro-1,4-hydroquinone, 3,5-dichloro-2-hydroxy-1,4-benzoquinone, and malic, maleic, picric, and acetic acids. A maximum degradation of about 90% was reached after 4 h of electrolysis at 0.83 V vs Ag/AgCl/KCl 3 M, using a GC/graphite-ZSM5(Mo) electrode. The electrodes modified with Mo, and especially that with ZSM5, the most hydrophobic zeolite, were active for the degradation of TCP. We conclude that the main role of the Mo species is to catalyze the hydrogen peroxide decomposition yielding reactive singlet oxygen, as evidenced by the pink color of 3,5-dichloro-2-hydroxy-1,4-benzoquinoneand confirmed by mass spectrometry.
dc.description.abstractGraphical abstract
dc.fuente.origenWOS
dc.identifier.doi10.1007/s10008-020-04590-6
dc.identifier.eissn1433-0768
dc.identifier.issn1432-8488
dc.identifier.urihttps://doi.org/10.1007/s10008-020-04590-6
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95149
dc.identifier.wosidWOS:000534870600001
dc.issue.numero1
dc.language.isoen
dc.pagina.final131
dc.pagina.inicio117
dc.revistaJournal of solid state electrochemistry
dc.rightsacceso restringido
dc.subject2
dc.subject4
dc.subject6-trichlorophenol
dc.subjectElectrooxidation
dc.subjectElectrocatalysis
dc.subjectGraphite-zeolite-Mo
dc.subjectCo electrode
dc.subjectSinglet oxygen formation
dc.subjectElectrolysis
dc.subject.ods06 Clean Water and Sanitation
dc.subject.odspa06 Agua limpia y saneamiento
dc.titleElectrodes based on zeolites modified with cobalt and/or molybdenum for pesticide degradation: part II-2,4,6-trichlorophenol degradation
dc.typeartículo
dc.volumen25
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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