Removal of Orange II (OII) dye by simulated solar photoelectro-Fenton and stability of WO2.72/Vulcan XC72 gas diffusion electrode

Author(s)

Paz, Edson C. ^{[1, 2]} ; Pinheiro, Victor S. ^[2] ; Sousa Joca, Jhonny Frank ^[2] ; Sotana de Souza, Rafael Augusto ^[3] ; Gentil, Tuani C. ^[2] ; Lanza, Marcos R. V. ^{[4, 5]} ; Moises de Oliveira, Hueder Paulo ^[2] ; Pereira Neto, Ana Maria ^[3] ; Gaubeur, Ivanise ^[2] ; Santos, Mauro C. ^[2]

Affiliation

^[1] Inst Fed Educ Ciencia & Tecnol Maranhao IFMA, Campus Acailandia, R Projetada S-N, BR-65930000 Acailandia, MA - Brazil

^[2] Univ Fed ABC UFABC, CCNH, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil

^[3] Univ Fed ABC UFABC, Ctr Engn Modelagem & Ciencias Socials Aplicadas C, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil

^[4] Univ Sao Paulo, IQSC, Caixa Postal 780, BR-13566590 Sao Carlos, SP - Brazil

^[5] UNESP, Inst Quim, Inst Natl Tecnol Altenat Deteccao Avaliacao Toxic, BR-14800900 Araraquara, SP - Brazil

• Document type: Journal article
• Source: Chemosphere; v. 239, JAN 2020.
• Web of Science Citations: 0

Abstract

The objectives of this study were to determine the viability of removing Orange II (OII) dye by simulated solar photoelectro-Fenton (SSPEF) and to evaluate the stability of a WO2.72/Vulcan XC72 gas diffusion electrode (GDE) and thus determine its best operating parameters. The GDE cathode was combined with a BDD anode for decolorization and mineralization of 350 mL of 0.26 mM OII by anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF) and photoelectro-Fenton (PEF) at 100, 150 and 200 mA cm(-2) and SSPEF at 150 mA cm(-2). The GDE showed successful operation for electrogeneration, good reproducibility and low leaching of W. Decolorization and OII decay were directly proportional to the current density (j). AO-H2O2 had a reduced performance that was only half of the SSPEF, PEF and EF treatments. The mineralization efficiency was in the following order: AO-H2O2 < EF < PEF approximate to SSPEF. This showed that the GDE, BDD anode and light radiation combination was advantageous and indicated that the SSPEF process is promising with both a lower cost than using UV lamps and simulating solar photoelectro-Fenton process. The PEF process with the lowest j (100 mA cm(-2)) showed the best performance-mineralization current efficiency. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

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