Removal of Acid Orange 7 from water by electrochemically generated Fenton's reagent
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- 作者：Ali Ö ; zcan ; Mehmet A. Oturan ; Nihal Oturan ; Yü ; cel Ş ; ahin
- 关键词：Advanced oxidation process ; Electro-Fenton ; Hydroxyl radicals ; Acid Orange 7 ; Degradation ; Mineralization pathway
- 刊名：Journal of Hazardous Materials
- 出版年：2009
- 出版时间：30 April 2009
- 年：2009
- 卷：163
- 期：2-3
- 页码：1213-1220
- 全文大小：643 K
文摘
The removal of azo dye Acid Orange 7 (AO7) from water was investigated by the electro-Fenton technology using electrogenerated hydroxyl radicals (OH) which leads to the oxidative degradation of AO7 up 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) × 1010 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.