Journal
DYES AND PIGMENTS
Volume 76, Issue 3, Pages 656-662Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2007.01.001
Keywords
electro-fenton; hydrogen peroxide; orange II; photoelectro-fenton
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This work was performed to compare several Advanced Oxidation Processes in the treatment of wastewater containing an organic dye. In particular, aqueous solutions containing 50 ppm Orange II (OG-II) in 0.05 M Na2SO4 at pH 3 and at room temperature were subjected to three different hydrogen peroxide-based oxidation processes in a recycle-batch reactor: Direct Photolysis, the Electro-Fenton process, and a Photoelectro-Fenton process with two different iron(II) concentrations (0.2 mM and 0.5 mM). By producing (OH)-O-center dot radicals as an active oxidant, all of these processes remove the color from the solution in a short time, but the Photoelectro-Fenton with the lower iron level performed best. It not only decolorized the solution in less than 5 min, but it also destroyed 80% of TOC in 60 min of treatment. The comparable TOC removal efficiency was 63% for the Electro-Fenton system and only 31 % for Direct Photolysis. It was found that higher levels of catalytic iron ions are detrimental to the Fenton-based processes. (c) 2007 Elsevier Ltd. All rights reserved.
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