Electrooxidation of sulfite at carbon paste electrode modified with ionic liquids derivated of N-octyl-pyridinium hexafluorophosphate with different substituents in the cation

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datacite.alternateIdentifier.citationJournal of the Chilean Chemical Society, Vol. 62, N° 4, 3721-3725, 2017
datacite.alternateIdentifier.doi10.4067/s0717-97072017000403721
datacite.creatorFuenzalida Ortiz, Francesca
datacite.creatorGarcía Sanhueza, Camilo
datacite.creatorGarcía Morgado, Macarena
datacite.creatorArce Escobar, Roxana
datacite.creatorBáez Aguilera, Carla
datacite.creatorAguirre Quintana, María
datacite.creatorIsaacs Casanova, Mauricio
datacite.creator Arévalo Morales, María
datacite.date2017
datacite.subject.englishIonic liquids
datacite.subject.englishN-octyl-pyridinium hexafluorophospate
datacite.subject.englishComposite ionic-liquid electrodes CILEs
datacite.subject.englishCarbon paste electrode CPE
datacite.subject.englishSulfite oxidation
datacite.subject.englishEffect of the substituent
datacite.titleElectrooxidation of sulfite at carbon paste electrode modified with ionic liquids derivated of N-octyl-pyridinium hexafluorophosphate with different substituents in the cation
dc.date.accessioned2021-04-30T17:05:04Z
dc.date.available2021-04-30T17:05:04Z
dc.description.abstractCarbon paste electrodes modified with a family of ionic liquids (as binders) derived from N-octyl-pyridinium hexafluorophosphate, (composite-ionic liquid electrodes (CILEs)) were studied toward the oxidation of sulfite as an inner-sphere probe reaction and compared to a conventional carbon paste electrode (CPE) in which the binder was mineral oil. The ionic liquids were modified at Para-position with substituents that are electron withdrawing: -CN (CILE/CN) and -CF3 (CILE/CF3) and substituents that are electron donating: -CH3 (CILECH3) and -OCH3 (CILE/OCH3), and compared with the ionic liquid without substituents (CILE/OPy). The results showed that CILEs are capable of catalyzing the sulfite oxidation, shifting the oxidation potential to more negative values compared to CPE. Also, they showed linear correlations between increasing sulfite concentration and increasing current density. The best system in terms of sensitivity was the electrode modified with the 4-methyl-N-octylpyridiniumhexafluorophosphate CILE/CH3 and. then, that modified with the non-substituted ionic liquid CILE/OPy measured by amperometry. In terms of potential, the best systems are the CILEs modified with ILs with inductive-substituents, -CH3 and -CF3 and OPy, indicating that the delocalization of the charge of the cation produced by the mesomeric-substituent (-OCH3 , -CN) diminishes the electrocatalytic behavior of these hinders for that oxidation. On the other hand, the analytical parameters of all the amperometric sensors studied here (all CILEs excepts CILE/OCH3) are good enough to he applied in food industry for samples without polyphenols at concentrations higher than ca. 1 mM of sulfite. Their stability is very high (at least 100 cycles after obtaining a stable response without changing its current, exposed to air and humidity) and they can be used to remove sulfite from wastewaters. Finally, to our knowledge, there are not comparative studies about the effect of changing the substituent of the cation in electrocatalysis of modified IL-electrodes.
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/3938
dc.language.isoen
dc.publisherSociedad Chilena de Química
dc.rightsObra bajo licencia Creative Commons Atribución-NoComercial-CompartirIgual 4.0 Internacional
dc.sourceJournal of the Chilean Chemical Society
oaire.resourceTypeArtículo de Revista
uct.catalogadorbmc
uct.comunidadRecursos Naturales
uct.facultadFacultad de Recursos Naturales
uct.indizacionSCIELO
uct.indizacionSCI EXPANDED
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