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Adsorption of pharmaceuticals from aqueous solutions on synthetic zeolites
Authors:Annalisa MartucciLuisa Pasti  Nicola MarchettiAlberto Cavazzini  Francesco DondiAlberto Alberti
Affiliation:a Department of Earth Sciences, University of Ferrara, Via Saragat, 1, I-44100 Ferrara, Italy
b Department of Chemistry, University of Ferrara, Via L. Borsari, 46, I-44123 Ferrara, Italy
Abstract:The objectives of this study were to measure the sorption capacity of a dilute solution of drugs in water on hydrophobic zeolites and to quantify aspects of their adsorption mechanisms for potential use in wastewater remediation. The removal of three drugs, erythromycin (ERY), carbamazepine (CBZ) and levofloxacin (FLX) from water using three organophilic zeolites (Y, mordenite (MOR), ZSM-5) was investigated. Adsorption isotherms show that these three drugs are adsorbed in remarkable amounts by Y. These data were confirmed by thermogravimetric analysis. The presence of these drugs inside the Y cage was revealed by unit cell parameter variations and structural deformations obtained by X-ray structure analyses carried out using the Rietveld method on zeolite after adsorption. Our results indicate that the adsorption properties of zeolitic materials do not only depend on micropore size and that zeolite shape selectivity also depends on structural features which are difficult to determine “a priori”. In order to test the ability of organophilic zeolites in removing drugs from wastewater, the adsorption of ERY, FLX and CBZ on zeolite Y from water samples collected at the outlet of a wastewater treatment plant located in Northern Italy was determined. These drugs were almost completely adsorbed by Y zeolite, confirming that this material is suitable for removing drugs from wastewater.
Keywords:Pharmaceutical   Zeolite   Adsorption   X-ray powder diffraction   Wastewater contaminant
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