New insights on the structure of the picloram-montmorillonite surface complexes

Hypothesis: The environmental mobility and bioavailability of Picloram (PCM) are determined by the amine and carboxylate chemical groups interaction with the soils mineral phases. Clay particles, such as montmorillonite (Mt), and the pH value of the media could play an important role in adsorption p...

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Autores principales:	Brown, José Luis Marco, Trinelli, María Alcira
Publicado:	2015
Materias:	Clay minerals Montmorillonite Picloram herbicide Surface complexes Biochemistry Carboxylation Dispersions Groundwater Groundwater pollution Pyridine Risk assessment Weed control X ray photoelectron spectroscopy Adsorption process Environmental mobility Groundwater contamination Inner sphere complexes Montmorillonite surface Montmorillonites (Mt) Picloram Surface complex Herbicides ground water montmorillonite organic matter picloram aluminum silicate bentonite clay herbicide soil acid dissociation constant adsorption Article complex formation desorption dispersion equilibrium constant pH porosity priority journal soil property thermogravimetry water contamination X ray diffraction chemistry infrared spectroscopy surface property Adsorption Aluminum Silicates Bentonite Photoelectron Spectroscopy Soil Spectroscopy, Fourier Transform Infrared Surface Properties X-Ray Diffraction
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v444_n_p115_MarcoBrown http://hdl.handle.net/20.500.12110/paper_00219797_v444_n_p115_MarcoBrown
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00219797_v444_n_p115_MarcoBrown
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spelling	paper:paper_00219797_v444_n_p115_MarcoBrown2023-06-08T14:44:58Z New insights on the structure of the picloram-montmorillonite surface complexes Brown, José Luis Marco Trinelli, María Alcira Clay minerals Montmorillonite Picloram herbicide Surface complexes Biochemistry Carboxylation Clay minerals Dispersions Groundwater Groundwater pollution Pyridine Risk assessment Weed control X ray photoelectron spectroscopy Adsorption process Environmental mobility Groundwater contamination Inner sphere complexes Montmorillonite surface Montmorillonites (Mt) Picloram Surface complex Herbicides ground water montmorillonite organic matter picloram aluminum silicate bentonite clay herbicide picloram soil acid dissociation constant adsorption Article clay complex formation desorption dispersion equilibrium constant pH porosity priority journal soil property thermogravimetry water contamination X ray diffraction X ray photoelectron spectroscopy chemistry infrared spectroscopy soil surface property Adsorption Aluminum Silicates Bentonite Herbicides Photoelectron Spectroscopy Picloram Soil Spectroscopy, Fourier Transform Infrared Surface Properties X-Ray Diffraction Hypothesis: The environmental mobility and bioavailability of Picloram (PCM) are determined by the amine and carboxylate chemical groups interaction with the soils mineral phases. Clay particles, such as montmorillonite (Mt), and the pH value of the media could play an important role in adsorption processes. Thus, the study of the role of soil components other than organic matter deserves further investigation for a more accurate assessment of the risk of groundwater contamination. Experiments: Samples with PCM adsorbed on Mt dispersions were prepared at pH 3-9. Subsequently, the dispersions were separated, washed, centrifuged and stored at room temperature. Picloram (PCM) herbicide interaction with surface groups of montmorillonite (Mt) was studied using XRD, DTA, FTIR and XPS techniques. Findings: The entrance of PCM into the Mt basal space, in two different arrangements, perpendicular and planar, is proposed and the final arrangement depends on PCM concentration. The interaction of PCM with Mt surface sites through the nitrogen of the pyridine ring and carboxylic group of PCM, forming bidentate and bridge inner-sphere complexes was confirmed by FTIR and XPS analysis. The acidity constant of the PCM adsorbed on the Mt surface was calculated. © 2014 Elsevier Inc. Fil:Marco-Brown, J.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Trinelli, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v444_n_p115_MarcoBrown http://hdl.handle.net/20.500.12110/paper_00219797_v444_n_p115_MarcoBrown
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Clay minerals Montmorillonite Picloram herbicide Surface complexes Biochemistry Carboxylation Clay minerals Dispersions Groundwater Groundwater pollution Pyridine Risk assessment Weed control X ray photoelectron spectroscopy Adsorption process Environmental mobility Groundwater contamination Inner sphere complexes Montmorillonite surface Montmorillonites (Mt) Picloram Surface complex Herbicides ground water montmorillonite organic matter picloram aluminum silicate bentonite clay herbicide picloram soil acid dissociation constant adsorption Article clay complex formation desorption dispersion equilibrium constant pH porosity priority journal soil property thermogravimetry water contamination X ray diffraction X ray photoelectron spectroscopy chemistry infrared spectroscopy soil surface property Adsorption Aluminum Silicates Bentonite Herbicides Photoelectron Spectroscopy Picloram Soil Spectroscopy, Fourier Transform Infrared Surface Properties X-Ray Diffraction
spellingShingle	Clay minerals Montmorillonite Picloram herbicide Surface complexes Biochemistry Carboxylation Clay minerals Dispersions Groundwater Groundwater pollution Pyridine Risk assessment Weed control X ray photoelectron spectroscopy Adsorption process Environmental mobility Groundwater contamination Inner sphere complexes Montmorillonite surface Montmorillonites (Mt) Picloram Surface complex Herbicides ground water montmorillonite organic matter picloram aluminum silicate bentonite clay herbicide picloram soil acid dissociation constant adsorption Article clay complex formation desorption dispersion equilibrium constant pH porosity priority journal soil property thermogravimetry water contamination X ray diffraction X ray photoelectron spectroscopy chemistry infrared spectroscopy soil surface property Adsorption Aluminum Silicates Bentonite Herbicides Photoelectron Spectroscopy Picloram Soil Spectroscopy, Fourier Transform Infrared Surface Properties X-Ray Diffraction Brown, José Luis Marco Trinelli, María Alcira New insights on the structure of the picloram-montmorillonite surface complexes
topic_facet	Clay minerals Montmorillonite Picloram herbicide Surface complexes Biochemistry Carboxylation Clay minerals Dispersions Groundwater Groundwater pollution Pyridine Risk assessment Weed control X ray photoelectron spectroscopy Adsorption process Environmental mobility Groundwater contamination Inner sphere complexes Montmorillonite surface Montmorillonites (Mt) Picloram Surface complex Herbicides ground water montmorillonite organic matter picloram aluminum silicate bentonite clay herbicide picloram soil acid dissociation constant adsorption Article clay complex formation desorption dispersion equilibrium constant pH porosity priority journal soil property thermogravimetry water contamination X ray diffraction X ray photoelectron spectroscopy chemistry infrared spectroscopy soil surface property Adsorption Aluminum Silicates Bentonite Herbicides Photoelectron Spectroscopy Picloram Soil Spectroscopy, Fourier Transform Infrared Surface Properties X-Ray Diffraction
description	Hypothesis: The environmental mobility and bioavailability of Picloram (PCM) are determined by the amine and carboxylate chemical groups interaction with the soils mineral phases. Clay particles, such as montmorillonite (Mt), and the pH value of the media could play an important role in adsorption processes. Thus, the study of the role of soil components other than organic matter deserves further investigation for a more accurate assessment of the risk of groundwater contamination. Experiments: Samples with PCM adsorbed on Mt dispersions were prepared at pH 3-9. Subsequently, the dispersions were separated, washed, centrifuged and stored at room temperature. Picloram (PCM) herbicide interaction with surface groups of montmorillonite (Mt) was studied using XRD, DTA, FTIR and XPS techniques. Findings: The entrance of PCM into the Mt basal space, in two different arrangements, perpendicular and planar, is proposed and the final arrangement depends on PCM concentration. The interaction of PCM with Mt surface sites through the nitrogen of the pyridine ring and carboxylic group of PCM, forming bidentate and bridge inner-sphere complexes was confirmed by FTIR and XPS analysis. The acidity constant of the PCM adsorbed on the Mt surface was calculated. © 2014 Elsevier Inc.
author	Brown, José Luis Marco Trinelli, María Alcira
author_facet	Brown, José Luis Marco Trinelli, María Alcira
author_sort	Brown, José Luis Marco
title	New insights on the structure of the picloram-montmorillonite surface complexes
title_short	New insights on the structure of the picloram-montmorillonite surface complexes
title_full	New insights on the structure of the picloram-montmorillonite surface complexes
title_fullStr	New insights on the structure of the picloram-montmorillonite surface complexes
title_full_unstemmed	New insights on the structure of the picloram-montmorillonite surface complexes
title_sort	new insights on the structure of the picloram-montmorillonite surface complexes
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v444_n_p115_MarcoBrown http://hdl.handle.net/20.500.12110/paper_00219797_v444_n_p115_MarcoBrown
work_keys_str_mv	AT brownjoseluismarco newinsightsonthestructureofthepiclorammontmorillonitesurfacecomplexes AT trinellimariaalcira newinsightsonthestructureofthepiclorammontmorillonitesurfacecomplexes
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New insights on the structure of the picloram-montmorillonite surface complexes

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