期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 167, 期 1-3, 页码 1226-1230出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2008.12.137
关键词
Electrochemical oxidation; BDD electrode; Ferrous sulphate; Ferrate ion
资金
- CONACyT [25602]
- Universidad Autonoma de Nuevo. Leon [CA1493-07]
This work shows preliminary results on the electrochemical oxidation process (EOP) using boron-doped diamond (BDD) electrode for acidic yellow 36 oxidation, a common azo dye used in textile industry. The study is centred in the synergetic effect of ferrous ions and hydroxyl free radicals for improving discoloration of azo dye. The assays were carried out in a typical glass cell under potentiostatic conditions. On experimental conditions, the EOP was able to partially remove the dye from the reaction mixture. The reaction rate increased significantly by addition of Fe2+ (1 mM as ferrous sulphate) to the system and by (assumed) generation of ferrate ion [Fe(VI)] over BDD electrode. Ferrate is considered as a highly oxidizing reagent capable of removing the colorant from the reaction mixture, in synergistic action with the hydroxyl radicals produced on the BDD surface. Further increases in the Fe2+ concentration lead to depletion of the reaction rate probably due to the hydroxyl radical scavenging effect of Fe2+ excess in the system. (C) 2009 Elsevier B.V. All rights reserved.
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