Advanced oxidation and mineralization of 3-indole butyric acid (IBA) by Fenton and Fenton-like processes
Date
2010-08-15
Authors
Azak, Hilal Safiye
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
The degradation and mineralization of 3-indole butyric acid (IBA) in aqueous solution was examined using Fenton and Fenton-like processes. Various operating conditions were evaluated including pH and the concentrations of iron ions (Fe2+ and Fe3+) and hydrogen peroxide (H2O2). The highest COD removal efficiency was achieved at 0.2 mM/0.6 mM Fe2+/H2O2 ratio and 0.2 mM/1.0 mM Fe3+/H2O2 ratio at pH 3 for Fenton and Fenton-like processes, respectively. IBA degradation and mineralization exhibited pseudo-first-order kinetics while the depletion of H2O2 and Fe2+ or Fe3+ exhibited zero-order kinetics during both processes in all experiments. 97% of IBA degradation proceeded via two distinctive kinetic regimes. The initial phase of the reaction was directly attributable to the Fenton reaction wherein nearly all of the OH center dot radicals were generated. This was followed by a slower degradation phase, which can be thought of as a series of Fenton-like reactions within a Fenton process. In the Fenton-like process, the initial phase lasted longer than in the Fenton process because the generation of OH center dot radicals proceeded at slower rate; however, 98% degradation of IBA was achieved. The mineralization of IBA was 16.2% and 50% for Fenton and Fenton-like processes, respectively. After 24 h, H2O2 was the limiting reagent for further mineralization of IBA intermediates present in the system. The results of the study showed that Fenton Process may be more useful when only removal of IBA is required and mineralization is unnecessary. But if mineralization of IBA is needed. Fenton-like process gains more important than Fenton Process due to its mineralization efficiency.
Description
Keywords
3-Indole butyric acid, Fenton processes, Degradation, Mineralization, P-chlorophenol, Waste-water, Degradation, Pesticides, Reagent, Optimization, Kinetics, Removel, Engineering, Environmental sciences & ecology, Acids, Chemical oxygen demand, Fatty acids, Free radicals, Hydrogen peroxide, Metal ions, Oxidation, Solutions, Advanced oxidation, Aqueous solutions, Butyric acids, COD removal efficiency, Fenton likes, Fenton process, Fenton reactions, Fenton-like process, Iron ions, Kinetic regime, Mineralization, OH radical, Operating condition, Pseudo-first order kinetics, Zero order kinetics, Carboxylic acid, Chemical oxygen demand, Hydrogen peroxide, Iron, Mineralization, Oxidation, PH, Mineralogy
Citation
Üstün, G. E. vd. (2010). "Advanced oxidation and mineralization of 3-indole butyric acid (IBA) by Fenton and Fenton-like processes". Journal of Hazardous Materials, 180(1-3), 508-513.