Removal of 8-quinolinecarboxylic acid pesticide from aqueous solution by adsorption on activated montmorillonites |
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Authors: | M Mekhloufi A Zehhaf A Benyoucef C Quijada E Morallon |
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Institution: | 1. Laboratoire de Chimie Organique, Macromoléculaire et des Matériaux, Université de Mascara, Bp 763, Mascara, 29000, Algeria 2. Departamento de Ingeniería Textil y Papelera, Universitat Politècnica de València, Pza Ferrandiz i Carbonel, 03801, Alcoy, Alicante, Spain 3. Departamento de Química Física e Instituto Universitario de Materiales, Universidad de Alicante, Apartado 99, 03080, Alicante, Spain
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Abstract: | Sodium montmorillonite (Na-M), acidic montmorillonite (H-M), and organo-acidic montmorillonite (Org-H-M) were applied to remove the herbicide 8-quinolinecarboxylic acid (8-QCA). The montmorillonites containing adsorbed 8-QCA were investigated by transmission electron microscopy, FT-IR spectroscopy, X-ray diffraction analysis, X-ray fluorescence thermogravimetric analysis, and physical adsorption of gases. Experiments showed that the amount of adsorbed 8-QCA increased at lower pH, reaching a maximum at pH 2. The adsorption kinetics was found to follow the pseudo-second-order kinetic model. The Langmuir model provided the best correlation of experimental data for adsorption equilibria. The adsorption of 8-QCA decreased in the order Org-H-M > H-M > Na-M. Isotherms were also used to obtain the thermodynamic parameters. The negative values of ΔG indicated the spontaneous nature of the adsorption process. |
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