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Removal of diclofenac sodium from aqueous solution by Isabel grape bagasse
Antunes M., Esteves V. I., Guégan R., Crespo J.S., Fernandes A. N., Giovanela M.
Chemical Engineering Journal 192 (2012) 114-121 - http://hal-insu.archives-ouvertes.fr/insu-00684443
Articles dans des revues avec comité de lecture
Planète et Univers/Interfaces continentales, environnement
Sciences de l'environnement/Milieux et Changements globaux
Removal of diclofenac sodium from aqueous solution by Isabel grape bagasse
Márjore Antunes 1, Valdemar I. Esteves 2, Régis Guégan () 3, J.S. Crespo 1, Andreia N. Fernandes 1, Marcelo Giovanela 1
1 :  Centro de Ciências Exatas e Tecnologia
Universidade de Caxias do Sul
Universidade de Caxias do Sul, 95070-560 Caxias do Sul, RS
2 :  Departamento de Química
Universidade de Aveiro
3 :  Institut des Sciences de la Terre d'Orléans (ISTO)
Université d'Orléans – CNRS : UMR7327 – INSU – Bureau de Recherches Géologiques et Minières (BRGM)
Campus Géosciences 1A, rue de la Férollerie 45071 Orléans cedex 2
The aim of the present work was to evaluate the morphologic and chemical characteristics of Isabel grape (Vitis labrusca x Vitis vinifera) bagasse and to describe the adsorption of diclofenac sodium (DCF) from aqueous solutions by this biomass. Grape bagasse was constituted mainly of particles with heterogeneous shapes and sizes, and it exhibited a macroporous structure and a low specific surface area (∼ 2 m2 g-1). The adsorbent material was also rich in oxygenated functional groups, especially -OH, and required an acidic pH to neutralize its surface. With respect to the adsorption of DCF, the percentage removal did not appear to depend on the initial concentration of the pharmaceutical. A pseudo-second-order kinetic model described the rate-controlling step, and the adsorption isotherms were well fitted by the Freundlich model. Concerning the thermodynamic data, the results showed that the adsorption of DCF onto grape bagasse occurred via an exothermic process accompanied by a decrease in the randomness at the solid/solution interface. Furthermore, the removal percentages of DCF ranged from 16.4 to 22.8%.

Chemical Engineering Journal
Publisher Elsevier
ISSN 1385-8947 

Adsorption – Diclofenac sodium – Isabel grape bagasse

Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS)
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Final_manuscript_CED-D-12-00184-1.pdf(477.8 KB)