期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 163, 期 2-3, 页码 1213-1220出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.07.088
关键词
Advanced oxidation process; Electro-Fenton; Hydroxyl radicals; Acid Orange 7; Degradation; Mineralization pathway
资金
- Anadolu University Research Found [061022]
The removal of azo dye Acid Orange 7 (AO7) from water was investigated by the electro-Fenton technology using electrogenerated hydroxyl radicals ((OH)-O-center dot) which leads to the oxidative degradation of AO7 LIP to its complete mineralization. H2O2 and Fe (II) ions are electrogenerated in a catalytic way at the carbon-felt cathode. AO7 decay kinetics and evolution of its oxidation intermediates were monitored by high-performance liquid chromatography. The absolute rate constant of AO7 hydroxylation reaction has been determined as (1.20 +/- 0.17) x 10(10) M-1 s(-1). The optimal Current value for the degradation of AO7 was found as 300 mA. AO7 degradation rate was found to decrease by increase in Fe3+ concentration beyond 0.1 mM. Mineralization of AO7 aqueous solutions was followed by total organic carbon (TOC) measurements and found to be 92%. Based on TOC evolution and identification of aromatic intermediates, short-chain carboxylic acids and inorganic ions released during treatment, a plausible mineralization pathway was proposed. (C) 2008 Elsevier B.V. All rights reserved.
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