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Title: Electrochemical oxidation of dibenzothiophene compounds on BDD electrode in acetonitrile-water medium
Author: Ornelas Dávila, O.
Lacalle Bergeron, L.
Ruiz Gutiérrez, P.
Elizalde González, M.P.
Dávila-Jiménez, M.M.
Sirés Sadornil, Ignacio
Brillas, Enric
Roig Navarro, A.F.
Beltrán Arandes, J.
Sancho Llopis, Juan V.
Keywords: Dessulfuració
Oxidació electroquímica
Electrolytic oxidation
Issue Date: 23-May-2019
Publisher: Elsevier B.V.
Abstract: The electrochemical oxidation of dibenzothiophene and two derivatives, namely 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene, was investigated either separately or as a mixture, on a BDD anode in a miscible acetonitrile (87.5% v/v)-water (12.5% v/v, 0.01 M NaNO3) solution. Linear sweep voltammetry, cyclic voltammetry, chronoamperometry and bulk electrolysis under potentiostatic conditions suggested the probable occurrence of two pathways: direct electrochemical oxidation and indirect reaction with hydroxyl radicals and other reactive oxygen species formed at the BDD anode surface during water discharge. The products extracted upon electrolysis at 1.5 and 2.0 V vs. SCE were analyzed by Fourier-transform infrared spectroscopy, gas chromatography-mass spectrometry and ultra-high performance liquid chromatography coupled to electrospray ionization and quadrupole time-of-flight mass spectrometry (UHPLC-ESI-Q-TOF-MS). The main molecules identified were the corresponding sulfoxides or sulfones, depending on the applied anodic potential. Possible oxidation routes for the dibenzothiophene compounds are proposed.
Note: Versió postprint del document publicat a:
It is part of: Journal of Electroanalytical Chemistry, 2019, vol. 847, num. 113172
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ISSN: 1572-6657
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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