Removal of 8-quinolinecarboxylic acid pesticide from aqueous solution by adsorption on activated montmorillonites

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Title: Removal of 8-quinolinecarboxylic acid pesticide from aqueous solution by adsorption on activated montmorillonites
Authors: Mekhloufi, Malika | Zehhaf, Abdelhafid | Benyoucef, Abdelghani | Quijada Tomás, César | Morallon, Emilia
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Adsorption isotherms | 8-Quinolinecarboxylic acid | Activated montmorillonite | Kinetics | Thermodynamic data
Knowledge Area: Química Física
Issue Date: Dec-2013
Publisher: Springer Science+Business Media Dordrecht
Citation: Environmental Monitoring and Assessment. 2013, 185(12): 10365-10375. doi:10.1007/s10661-013-3338-5
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.
Sponsor: This work was supported by the National Agency for the Development of University Research (CRSTRA) and the Directorate General of Scientific Research and Technological Development of Algeria. The Ministerio de Economía y Competitividad (MAT2010-15273 project) and FEDER are also acknowledged.
ISSN: 0167-6369 (Print) | 1573-2959 (Online)
DOI: 10.1007/s10661-013-3338-5
Language: eng
Type: info:eu-repo/semantics/article
Rights: The final publication is available at Springer via
Peer Review: si
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Appears in Collections:INV - GEPE - Artículos de Revistas

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