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Performance evaluation of organoclays for the amoxicillin retention in a dynamic context

Régis Guégan 1, * Lydie Le Forestier 2, 3 
* Corresponding author
3 Biogéosystèmes Continentaux - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327
Abstract : The hydraulic conductivity of diverse organoclays was determined through percolation experiments and compared to a raw Na-montmorillonite (Na-Mt). The incorporation of surfactants even at low content drastically changes the hydraulic conductivity with a large increase of about two order of magnitude in contrast to that of Na-Mt (10-12 m s-1). Batch kinetics and equilibrium adsorption experiments confirmed the proper affinity of organoclays to a zwitterion antibiotic: the amoxicillin (AMX) which was quickly adsorbed (at a time below 30 min) at large amounts (up to 1.4 × 10-3 mol g-1). However, in percolation conditions, the significant increase of the permeability led to a short interaction time between the organoclays and the pharmaceutical. In contrast to Na-Mt for which it took age to get only one drop of AMX, leachates, resulting of a percolation through organoclays, were collected for a time below 10 min, not enough sufficient to ensure a proper removal of an antibiotic with concentration reduced by 5-80% of the initial solution.
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Régis Guégan, Lydie Le Forestier. Performance evaluation of organoclays for the amoxicillin retention in a dynamic context. Chemical Engineering Journal, Elsevier, 2021, 406, pp.126859. ⟨10.1016/j.cej.2020.126859⟩. ⟨insu-02931496⟩

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