Bioallethrin degradation by photo-Fenton process in acetonitrile/water and aqueous β-cyclodextrin solutions

NATERA, JOSÉ; MASSAD, WALTER A.; SANCHO, MATÍAS I.; SANCHO, MATÍAS I.; POSSETTO, DAVID; GARCÍA, NORMAN A.; POSSETTO, DAVID; GARCÍA, NORMAN A.; NATERA, JOSÉ; MASSAD, WALTER A.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY

ELSEVIER SCIENCE SA

Año: 2018 vol. 365 p. 103 - 109

1010-6030

Bioallethrin (Bio) is an insecticide that chemically and functionally belongs to the family of the synthetic in-secticides named pyrethroids. In this work the degradation of Bio is studied by the photo-Fenton and photo-Fenton-modi ed processes. The rst one produces the complete mineralization of Bio in less than one hour of fi fiirradiation. However, due to the low solubility of Bio in water, diff fi erent modi cations of the photo-Fentonprocess were tested. First, the photo-Fenton process was carried out in mixtures of di erent acetonitrile/water ffproportions. Although acetonitrile deactivates the hydroxyl radical, the main oxidizing agent in the photo-Fenton process, a Bio degradation greater than 90% is achieved in 80 min of reaction. Second, degradation of Biowas evaluated by photo-Fenton in a medium with -cyclodextrin ( -CD), where the Bio solubility could be β βincreased at least thirty- ve times. The association constant of Bio to -CD was measured to be fi β1933 ± 300 M−1and molecular simulation results indicate a 1:1 inclusion complex stabilized by the formationof intermolecular H-bonds. The Bio degradation rate in this medium was similar to that observed in aqueousmedia. The use of -CD presents a friendly alternative to the environment for the degradation of the pyrethroid βinsecticide.