Fluorinated fungicide and organically modified Patagonian montorillonite: study of the interactions and surface properties

ROSA MARIA TORRES SANCHEZ; FEDERICO MANUEL FLORES; JOCELYNE BRENDLÉ; ERIC BRENDLÉ; SÉVERINNE RIGOLET

Frankfort

Simposio; IGC Symposium 2014; 2014

Fungicides such as fludioxonil are essential for maintaining healthy crops and reliable, high-quality yields. However, using these bioactive molecules poses environmental issues including mainly their leaching and migration in soils and groundwater. To circumvent these drawbacks, raw clays and clays modified with organic cations have been proposed as effective barriers to prevent the mobility of pesticides and fungicides and as slow release formulations of the active molecules. In this work, a raw Patagonian montmorillonite organically modified with octadecyltrimethylammonium cations was investigated as adsorbent for fluodioxonil (4-(2,2-difluoro-1,3-benzodioxol-4-yl)-1H-pyrrole-3-carbonitrile. Beside XRD and TGA characterizations,13C and 19F solid state NMR were used to gather information about the mobility of the organic species and the interactions of fludioxonil with the inorganic framework respectively. The effect of the organic treatment with octadecylatrimethylammonium cations and the presence of fludioxonil on the surface energy of the montmorillonite was studied by Inverse Gas Chromatography.