Mineralization and efficiency in the homogeneous Fenton Orange G oxidation

•Orange G solution is instantaneously discolorized by homogeneous Fenton process.•A lumped two-stage model predicts satisfactorily the evolution of mineralization.•Mineralization rate is mainly improved by reaction temperature.•A proper oxidant dosage strategy enhances mineralization and oxidant eff...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2013-10, Vol.142-143, p.214-221
Main Authors: Doumic, Lucila I., Haure, Patricia M., Cassanello, Miryan C., Ayude, María A.
Format: Article
Language:English
Subjects:
Azo dye
Catalysis
Catalysts
Chemistry
Exact sciences and technology
Fenton oxidation
General and physical chemistry
Hydrogen peroxide
Intensification process
Mineralization
Oxidants
Oxidation
Oxidizing agents
Process intensification
Strategy
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:•Orange G solution is instantaneously discolorized by homogeneous Fenton process.•A lumped two-stage model predicts satisfactorily the evolution of mineralization.•Mineralization rate is mainly improved by reaction temperature.•A proper oxidant dosage strategy enhances mineralization and oxidant efficiency. This study focuses on the homogeneous Fenton oxidation of the synthetic azo-dye Orange G as a model compound. The impact of initial TOC, hydrogen peroxide and catalyst concentrations and of temperature on mineralization and efficiency in the use of hydrogen peroxide is addressed. Dissolved oxygen concentration is monitored as an indication of the efficient use of H2O2 in the process. A two-stage lumped kinetic model is proposed to address the effect of initial TOC, catalyst and oxidant concentrations and temperature on total organic carbon consumption. Temperature increase and dosification of the oxidant are evaluated and compared as process intensification strategies.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2013.04.054