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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2015
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| 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 |
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paper:paper_00219797_v444_n_p115_MarcoBrown |
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dspace |
| 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 |
| bdutipo_str |
Repositorios |
| _version_ |
1764820557928333312 |