Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies
The kinetics of the adsorption of picloram (PCM) onto montmorillonite (Mt) was studied in situ by attenuated total reflectance Fourier-transform infrared spectra (ATR-FTIR). Pseudo-first-order, pseudo-second-order, intra-particle diffusion and mixed surface reaction intra-particle diffusion-controll...
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todo:paper_09277757_v449_n1_p121_MarcoBrown2023-10-03T15:47:08Z Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies Marco-Brown, J.L. Areco, M.M. Torres Sánchez, R.M. Dos Santos Afonso, M. Adsorption isotherms Adsorption kinetics Herbicide Montmorillonite Picloram Adsorption Adsorption isotherms Clay minerals Diffusion in solids Dyes Fourier transform infrared spectroscopy Kinetics Pyridine Surface reactions Weed control Adsorption equilibrium isotherms Adsorption kinetics Attenuated total reflectance Fourier transform infra reds Inner sphere complexes Intra-particle diffusion Montmorillonite surface Picloram Herbicides montmorillonite picloram adsorption adsorption kinetics aqueous solution article bioavailability biosorption diffusion equilibrium constant infrared spectroscopy isotherm kinetics priority journal reaction analysis scanning electron microscopy The kinetics of the adsorption of picloram (PCM) onto montmorillonite (Mt) was studied in situ by attenuated total reflectance Fourier-transform infrared spectra (ATR-FTIR). Pseudo-first-order, pseudo-second-order, intra-particle diffusion and mixed surface reaction intra-particle diffusion-controlled kinetic models were applied to the experimental results. The latter was the model that best represented the experimental results. The adsorption equilibrium isotherms revealed the presence of two independent adsorption processes on different surface sites. The adsorption isotherms normalized by the surface area were fitted with the Langmuir and Freundlich models to obtain the respective parameters.Due to the anionic form of PCM, the adsorption onto the external clay mineral surface sites followed by the entrance of the PCM molecule into the Mt basal space in a less energetically favorable pathway was proposed. The interaction of PCM with montmorillonite surface sites through nitrogen of the pyridine ring and carboxylic group by forming an inner sphere complex was confirmed by ATR-FTIR. © 2014 Elsevier B.V. Fil:Marco-Brown, J.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Areco, M.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09277757_v449_n1_p121_MarcoBrown |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Adsorption isotherms Adsorption kinetics Herbicide Montmorillonite Picloram Adsorption Adsorption isotherms Clay minerals Diffusion in solids Dyes Fourier transform infrared spectroscopy Kinetics Pyridine Surface reactions Weed control Adsorption equilibrium isotherms Adsorption kinetics Attenuated total reflectance Fourier transform infra reds Inner sphere complexes Intra-particle diffusion Montmorillonite surface Picloram Herbicides montmorillonite picloram adsorption adsorption kinetics aqueous solution article bioavailability biosorption diffusion equilibrium constant infrared spectroscopy isotherm kinetics priority journal reaction analysis scanning electron microscopy |
| spellingShingle |
Adsorption isotherms Adsorption kinetics Herbicide Montmorillonite Picloram Adsorption Adsorption isotherms Clay minerals Diffusion in solids Dyes Fourier transform infrared spectroscopy Kinetics Pyridine Surface reactions Weed control Adsorption equilibrium isotherms Adsorption kinetics Attenuated total reflectance Fourier transform infra reds Inner sphere complexes Intra-particle diffusion Montmorillonite surface Picloram Herbicides montmorillonite picloram adsorption adsorption kinetics aqueous solution article bioavailability biosorption diffusion equilibrium constant infrared spectroscopy isotherm kinetics priority journal reaction analysis scanning electron microscopy Marco-Brown, J.L. Areco, M.M. Torres Sánchez, R.M. Dos Santos Afonso, M. Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies |
| topic_facet |
Adsorption isotherms Adsorption kinetics Herbicide Montmorillonite Picloram Adsorption Adsorption isotherms Clay minerals Diffusion in solids Dyes Fourier transform infrared spectroscopy Kinetics Pyridine Surface reactions Weed control Adsorption equilibrium isotherms Adsorption kinetics Attenuated total reflectance Fourier transform infra reds Inner sphere complexes Intra-particle diffusion Montmorillonite surface Picloram Herbicides montmorillonite picloram adsorption adsorption kinetics aqueous solution article bioavailability biosorption diffusion equilibrium constant infrared spectroscopy isotherm kinetics priority journal reaction analysis scanning electron microscopy |
| description |
The kinetics of the adsorption of picloram (PCM) onto montmorillonite (Mt) was studied in situ by attenuated total reflectance Fourier-transform infrared spectra (ATR-FTIR). Pseudo-first-order, pseudo-second-order, intra-particle diffusion and mixed surface reaction intra-particle diffusion-controlled kinetic models were applied to the experimental results. The latter was the model that best represented the experimental results. The adsorption equilibrium isotherms revealed the presence of two independent adsorption processes on different surface sites. The adsorption isotherms normalized by the surface area were fitted with the Langmuir and Freundlich models to obtain the respective parameters.Due to the anionic form of PCM, the adsorption onto the external clay mineral surface sites followed by the entrance of the PCM molecule into the Mt basal space in a less energetically favorable pathway was proposed. The interaction of PCM with montmorillonite surface sites through nitrogen of the pyridine ring and carboxylic group by forming an inner sphere complex was confirmed by ATR-FTIR. © 2014 Elsevier B.V. |
| format |
JOUR |
| author |
Marco-Brown, J.L. Areco, M.M. Torres Sánchez, R.M. Dos Santos Afonso, M. |
| author_facet |
Marco-Brown, J.L. Areco, M.M. Torres Sánchez, R.M. Dos Santos Afonso, M. |
| author_sort |
Marco-Brown, J.L. |
| title |
Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies |
| title_short |
Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies |
| title_full |
Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies |
| title_fullStr |
Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies |
| title_full_unstemmed |
Adsorption of picloram herbicide on montmorillonite: Kinetic and equilibrium studies |
| title_sort |
adsorption of picloram herbicide on montmorillonite: kinetic and equilibrium studies |
| url |
http://hdl.handle.net/20.500.12110/paper_09277757_v449_n1_p121_MarcoBrown |
| work_keys_str_mv |
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