Showing papers by "F. Javier Benitez published in 1996"

Oxidation of Vanillic acid as a model of polyphenolic compounds in olive oil wastewaters. III. Combined UV radiation‐hydrogen peroxide oxidation

Abstract: The oxidation of Vanillic acid by the Advanced Oxidation Process (UV radiation and hydrogen peroxide) has been conducted modifying the temperature, pH and initial hydrogen peroxide concentration. A positive influence of those variables on the global degradation process is observed. From a simple reaction mechanism which is proposed, a general reaction rate equation is deduced. The application of the experimental data to this rate equation leads to the evaluation of the kinetic constants for the radical reaction between the Vanillic acid and the hydroxyl radicals generated in the photodecomposition of hydrogen peroxide. These kinetic constants can be correlated as a function of the temperature by the Arrhenius equation:

Photolytic decomposition of bentazone

Abstract: The photolytic decomposition of the herbicide Bentazone (3-isopropyl-1H-2,1,3-benzothiadiazin-4-3H-one 2,2 dioxide) has been conducted by direct polychromatic UV radiation, and by the combination of that UV radiation with hydrogen peroxide. The experiments were performed at various temperatures and pH values, and the initial hydrogen peroxide concentration in the combined process was also varied. An Emission Model was used to evaluate the radiation flow rate absorbed by the reacting medium for each reaction time. From simple mechanisms, the rate equations for both processes were obtained. The application of the experimental data to those equations allows one to determine the quantum yields for the direct photolysis, and the kinetic constants for the reaction between Bentazone and the hydroxyl radicals generated in the combined photolysis.