Photo-Fenton Degradation of a Herbicide with Simulated Solar Radiation. Kinetic Model using the Ferrioxalate Complex

ALFANO, O.M.; CONTE, L.O.; SCHENONE, A.V.; ALBIZZATI, E.D.

Congreso; 22nd World Congress & Exhibition: Ozone and Advanced Oxidation Leading-edge Science and Technologies; 2015

A theoretical and experimental study of the homogeneous photo-Fenton degradation of herbicide 2,4-dichlorophenosyacetic acid (2,4-D) is presented. Firstly, different sources of iron in water solution were studied: sulphate, oxalate and citrate complexes. The behaviour of these complexes was evaluated by means of two parameters: (i) the photonic efficiencies of degradation and mineralization; and (ii) the quentum efficiencies of degradtion and mineralization. The ferrioxalate system presented the best performance for conditions at pH = 5. From these results, a kinetic model derived from a reaction sequence is proposed using the ferrioxalate complex as iron source, high radiation level and the highest concentration of hydrogen peroxide, the conversion of 2,4-D a good agreement between the kinetic model and experimental data, for a rather wide range of the operating variables, was observed.