Electrochemical oxidation of paraquat in neutral medium

Autor:	M. I. S. Pereira, C.M. Borges, M.H. Mendonça, M.A.M. Cartaxo
Rok vydání:	2015
Předmět:	Electrolysis Aqueous solution Chemistry General Chemical Engineering Inorganic chemistry Oxide Electrochemistry Cathode Anode law.invention chemistry.chemical_compound law Electrode Cyclic voltammetry
Zdroj:	Electrochimica Acta. 176:1010-1018
ISSN:	0013-4686
DOI:	10.1016/j.electacta.2015.07.099
Popis:	Steel, Pt and pelleted Co 2 FeO 4 electrodes were used for the electrochemical oxidation of paraquat in aqueous solutions at room temperature. The oxide electrodes were characterized by cyclic voltammetry. Paraquat electrochemical oxidation was carried out by electrolysis at constant current and monitored by UV–vis absorbance measurements. Different anode/cathode pairs were used. After 1.5 h of electrolysis the highest removal (≈79%), was obtained with the electrode pair Pt/steel followed by Co 2 FeO 4 /Pt (≈55%), corresponding to the paraquat oxidation by a conversion mechanism. Removals of ≈64% were obtained with Co 2 FeO 4 / Co 2 FeO 4 after 3 h of electrolysis. Mass spectrometry analysis indicates that the main intermediate oxidation products were monopyridone and dipyridone derivatives.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7b3b8b0e7c737cc4e34d94a3031c9dfb https://doi.org/10.1016/j.electacta.2015.07.099 Zobrazit plný text záznamu Full Text from ScienceDirect