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Type: Artigo de periódico
Title: Kinetics of the oxidation of formaldehyde in a flow electrochemical reactor with TiO2/RuO2 anode
Author: Fukunaga, MT
Guimaraes, JR
Bertazzoli, R
Abstract: This paper reports the electrochemical degradation of solutions containing formaldehyde by means of an electrochemical tubular flow reactor with a titanium anode coated with metal oxides (Ti/Ru0.3Ti0.7O2). Due to the simplicity and low molecular weight of the compound it was possible to achieve high mineralization rates; the oxidation reaction of formaldehyde as well as TOC and COD removal were controlled by mass transfer. For solutions with 0.4 g L-1 of formaldehyde, electrodegradation followed a pseudo first-order kinetics, and the mass transport coefficients were calculated. After the experiments, a 97% reduction of TOC was observed, and the final formaldehyde and COD concentrations were below the detection limit threshold. For solutions with 12 g L-1 of formaldehyde processed at 100 mA cm-2, a transition from a zero-order kinetics to a first-order kinetics started at the concentration for which the current density corresponded to the value of the limiting current. (c) 2007 Elsevier B.V. All rights reserved.
Subject: formaldehyde electrooxidation
oxide anodes
electrochemical reactor
Country: Suíça
Editor: Elsevier Science Sa
Citation: Chemical Engineering Journal. Elsevier Science Sa, v. 136, n. 41700, n. 236, n. 241, 2008.
Rights: fechado
Identifier DOI: 10.1016/j.cej.2007.04.006
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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