Removal of 8-quinolinecarboxylic acid pesticide from aqueous solution by adsorption on activated montmorillonites
Contribuinte(s) |
Universidad de Alicante. Departamento de Química Física Universidad de Alicante. Instituto Universitario de Materiales Electrocatálisis y Electroquímica de Polímeros |
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Data(s) |
23/04/2015
23/04/2015
01/12/2013
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Resumo |
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. 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. |
Identificador |
Environmental Monitoring and Assessment. 2013, 185(12): 10365-10375. doi:10.1007/s10661-013-3338-5 0167-6369 (Print) 1573-2959 (Online) http://hdl.handle.net/10045/46334 10.1007/s10661-013-3338-5 |
Idioma(s) |
eng |
Publicador |
Springer Science+Business Media Dordrecht |
Relação |
http://dx.doi.org/10.1007/s10661-013-3338-5 |
Direitos |
The final publication is available at Springer via http://dx.doi.org/10.1007/s10661-013-3338-5 info:eu-repo/semantics/restrictedAccess |
Palavras-Chave | #Adsorption isotherms #8-Quinolinecarboxylic acid #Activated montmorillonite #Kinetics #Thermodynamic data #Química Física |
Tipo |
info:eu-repo/semantics/article |