INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Reaction Kinetic Model for 2,4-Dichlorophenoxyacetic Acid Decomposition in Aqueous Media Including Direct Photolysis, Direct Ozonatio?n, Ultraviolet C, and pH Enhancement
Autor/es:
LOVATO MARÍA, MARTIN CARLOS, CASSANO ALBERTO; GILLIARD, MARIA BELEN
Revista:
INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2013 vol. 52 p. 14034 - 14048
ISSN:
0888-5885
Resumen:
ABSTRACT This report presents a comprehensive study of the degradation kinetics of herbicide 2,4-D using ozone with and without intensification with UVC radiation. The by-products cause several seriesparallel reactions that compete with the process of photon absorption when radiation is applied. Five processes were analyzed separately: (i) the direct photolysis of 2,4-D and its main byproducts,, (ii) direct ozonation in the absence of hydroxyl radicals using tert-butanol as radical scavenger, (iii) the oxidation when ozone reacts in parallel with hydroxyl radicals, (iv) the reaction enhanced with UVC radiation and (v) the oxidation improved by pH modifications. A kinetic model was developed based on the main reaction by-products. The corresponding parameters of the reacting system were determined (9 of its 29 kinetic constants were previously unknown). Simulation results, including a rigorous description of the reacting system and the radiation field (having dark and illuminated volumes) agree very well with the experimental data.