Journal
DYES AND PIGMENTS
Volume 77, Issue 1, Pages 129-136Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2007.04.002
Keywords
Graphite-PTFE cathode preparation; electro-generated H2O2; azo dye treatment; methyl red; electro-fenton; decolorization
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An undivided electrochemical system was used to produce hydrogen peroxide on a graphite-polytetrafluoroethylene cathode. Key factors for cathode preparation, electrochemical activity as well as cathode stability were investigated. The current efficiency for hydrogen peroxide production was similar to 61-78% over a wide pH range (3-11) which decayed insignificantly after 10 times reuse. The influence of Na2SO4, pH, cathodic potential, initial dye concentration and ferrous ion concentration on decolorization were systematically studied. The results show that the presence of ferrous ion improved color removal greatly; at 0.2 mM Fe (2+) almost 80% of the dye could be removed after 20 min, indicating that the electro-Fenton process offers promise for dye removal. (C) 2007 Elsevier Ltd. All rights reserved.
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