Journal
CHEMOSPHERE
Volume 210, Issue -, Pages 1137-1144Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.07.116
Keywords
Direct Blue 71; Ponceau SS; Solar photoelectro-Fenton; Tartrazine; Water treatment
Categories
Funding
- AEI/FEDER, EU [CTQ2016-78616-R]
- National Council for Scientific and Technological Development, Brazil [CNPq - 465571/2014-0, CNPq - 446846/2014-7, CNPq - 401519/2014-7T]
- CAPES
- doutorado sanduiche scholarship under the Program PDSE-CAPES [88881.133501/2016-01]
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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)-O-center dot 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)-O-center dot formed in the bulk from Fenton's reaction. EF yielded partial mineralization by formation of molecules with high stability against (OH)-O-center dot. 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). (C) 2018 Elsevier Ltd. All rights reserved.
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