Removal of Orange II (OII) dye by simulated solar photoelectro-Fenton and stability of WO2.72/Vulcan XC72 gas diffusion electrode. (January 2020)

• Record Type: Journal Article
• Authors: Paz, Edson C.; Pinheiro, Victor S.; Joca, Jhonny Frank Sousa; de Souza, Rafael Augusto Sotana; Gentil, Tuani C.; Lanza, Marcos R.V.; de Oliveira, Hueder Paulo Moisés; Neto, Ana Maria Pereira; Gaubeur, Ivanise; Santos, Mauro C.
• Is Part Of: Chemosphere. Volume 239(2020)
• Publication Date: 2020-01
• Subjects: WO2.72/Vulcan XC72 -- Stability -- Orange II -- EAOPs -- Simulated solar photoelectro-Fenton; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2019.124670
• Languages: English
• ISSNs: 0045-6535

Abstract

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 H2 O2 (AO-H2 O2 ), 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-H2 O2 had a reduced performance that was only half of the SSPEF, PEF and EF treatments. The mineralization efficiency was in the following order: AO-H2 O2 < EF < PEF ≈ 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. Highlights: Removal of Orange II (OII) dye by simulated solar photoelectro-Fenton SSPEF. The GDE showed successful operation and low leaching of W. The mineralization efficiency was in the order: AO-H2 O2 < EF < PEF ≈ SSPEF. SSPEF process is promising with a lower cost than using UV lamps.