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2018-07-23

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cc-by-nc-nd (c) Elsevier Ltd, 2018
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/152982

Total mineralization of mixtures of Tartrazine, Ponceau SS and Direct Blue 71 azo dyes by solar photoelectro-Fenton in pre-pilot plant

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Recurs relacionat

https://doi.org/10.1016/j.chemosphere.2018.07.116

Resum

Mixtures of monoazo Tartrazine, diazo Ponceau SS and triazo Direct Blue 71 dyes with 105 mg L-1 of total organic carbon (TOC) in 0.050 M Na2SO4 at pH 3.0 have been treated by solar photoelectro-Fenton (SPEF). Experiments were carried out in a 2.5 L pre-pilot plant with a Pt/air-diffusion cell coupled to a solar planar photoreactor. Comparative trials were made by anodic oxidation with electrogenerated H2O2 (AO-H2O2) and electro-Fenton (EF) to better understand the role of oxidizing agents. AO-H2O2 gave poor degradation due to the low oxidation ability of ●OH formed at the Pt anode and H2O2 produced at the cathode. Similar color removal was achieved in EF and SPEF because the main oxidant was ●OH formed in the bulk from Fenton's reaction. EF yielded partial mineralization by formation of molecules with high stability against ●OH. In contrast, these by-products were rapidly photolyzed under sunlight irradiation in SPEF, which was the most powerful treatment. Up to 8 linear final carboxylic acids were detected, along with the release of sulfate and ammonium ions. The effect of Fe2+ and azo dye concentrations, and current density over the SPEF performance was assessed. Total mineralization of azo dyes mixtures occurred when operating up to 105 mg L-1 TOC with 0.50 mM Fe2+ at 100 mA cm-2.

Matèries

Depuració de l'aigua, Oxidació electroquímica

Matèries (anglès)

Water purification, Electrolytic oxidation

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Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

DOS SANTOS, Alexsandro Jhones, et al. Total mineralization of mixtures of Tartrazine, Ponceau SS and Direct Blue 71 azo dyes by solar photoelectro-Fenton in pre-pilot plant. Chemosphere. 2018. Vol. 210, num. 1137-1144. ISSN 0045-6535. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/152982

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