Dye-sensitized photodegradation of the fungicide carbendazim and related benzimidazoles

Chemosphere
J EscaladaN A García

Abstract

The present work studies the visible-light-promoted photodegradation of the colorless fungicide carbendazim (methyl 2-benzimidazolecarbamate) and several 2-substituted benzimidazoles (SBZ's), in water or water-methanol solution, in the presence of air and, as a photosensitizer, the synthetic xanthene dye Rose Bengal (RB) or the natural pigment riboflavin (Rf). The results indicate that the degradation of each particular SBZ depends on its chemical structure and on the sensitizer employed. In the presence of RB, the degradation always operates via a singlet molecular oxygen (O(2)((1)Delta(g)))-mediated mechanism, through a highly efficient process, as deduced from the comparison of the rate constants for physical and chemical quenching of O(2)((1)Delta(g)). In the presence of Rf, the visible-light irradiation of any of the studied SBZ's produces a series of competitive processes that depend on the relative concentrations of Rf and SBZ. These processes include the quenching of excited singlet and triplet Rf states by the SBZ and the generation of both O(2)((1)Delta(g)) and superoxide radical anion (O(2)(-)), the latter generated by electron transfer from excited Rf species to the dissolved oxygen. The overall result is the photod...Continue Reading

References

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Citations

Nov 2, 2011·Chemical Reviews·M Luisa MarinMiguel A Miranda
May 7, 2014·Journal of Photochemistry and Photobiology. B, Biology·Adriana PajaresNorman A García
May 23, 2012·Journal of Photochemistry and Photobiology. B, Biology·Ernesto HaggiNorman A García
Jun 25, 2013·Photochemistry and Photobiology·Rebeca PurporaNorman A García
Jul 25, 2015·Redox Report : Communications in Free Radical Research·Mariela GonzálezNorman A García
Mar 31, 2015·Environmental Science. Processes & Impacts·Elisabeth M L JanssenKristopher McNeill
Nov 30, 2012·The Journal of Physical Chemistry. B·Laura I HernándezRodrigo E Palacios
Oct 8, 2016·Redox Report : Communications in Free Radical Research·M G BaruaS Criado
Nov 8, 2018·Photochemistry and Photobiology·Eduardo GaticaWalter A Massad
Mar 29, 2020·Photochemistry and Photobiology·Frida C D Dimarco PalenciaMaría P Montaña
Jan 1, 2011·Journal of Radioanalytical and Nuclear Chemistry·A Bojanowska-CzajkaM Trojanowicz
Jan 15, 2009·Journal of Environmental Quality·Attila Kiss, Diána Virág
Jul 23, 2008·Journal of Agricultural and Food Chemistry·Juan Pablo EscaladaNorman A García
Jul 16, 2019·Environmental Science & Technology·Alessandro ManfrinNadine Borduas-Dedekind

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