PHOTO-FENTON DEGRADATION OF GLYPHOSATE USING A FAUJASITE ZEOLITE MODIFIED WITH IRON

ARIEL VINUESA; LUCIANA BONETTO; GEORGINA ORTENZI; CANDELARIA LEAL MARCHENA; CLARA SAUX

Congreso; 28º Congresso Ibero-Americano de Catálise; 2022

N-(Phosphonomethyl)glycine (Glyphosate) degradation in aqueous solutions was studied by means of aphoto-Fenton system. A commercial zeolite Y was modified with iron by the wet impregnation method to beused as heterogeneous Fenton catalyst. The material was physicochemically characterized by means of XRD,DRS UV-Vis and TPR. Small and well dispersed hematite nanoparticles were found. Glyphosate degradationwas followed by ion chromatography. After 4 h of reaction, glyphosate was completely eliminatedemploying Y-6Fe as heterogeneous photo-Fenton catalyst. Adsorption tests showed less than 25% of theagrochemical reduction. The herbicide was extremely stable, since photolysis reactions did not showchanges. Hydrogen peroxide concentration was also studied, resulting in 50 mmol/l as optimal. Reaction pHshowed that good degradation results could be obtained even at neutral conditions (pH 7). In order to studycatalyst stability, Fe leaching was evaluated.