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Marco-Brown, J.L.; Trinelli, M.A.; Gaigneaux, E.M.; Torres Sánchez, R.M.; Dos Santos Afonso, M. "New insights on the structure of the picloram-montmorillonite surface complexes" (2015) Journal of Colloid and Interface Science. 444:115-122
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Abstract:

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.

Registro:

Documento: Artículo
Título:New insights on the structure of the picloram-montmorillonite surface complexes
Autor:Marco-Brown, J.L.; Trinelli, M.A.; Gaigneaux, E.M.; Torres Sánchez, R.M.; Dos Santos Afonso, M.
Filiación:Departamento de Química Inorgánica, Analítica y Química Física e INQUIMAE, FCEN, UBA, Ciudad Universitaria, Pabellón II, Buenos Aires, C1428EHA, Argentina
Université Catholique de Louvain, Institute of Condensed Matter and Nanosciences (IMCN), Division Solids, Molecules and Reactivity (MOST), Croix du Sud 2/L7.05.17, Louvain-la-Neuve, B-1348, Belgium
CETMIC (Centro de Tecnología en Minerales y Cerámica), Camino Centenario y 506 CC (49), M. B. Gonnet, B1897ZCA, Argentina
Palabras clave: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
Año:2015
Volumen:444
Página de inicio:115
Página de fin:122
DOI: http://dx.doi.org/10.1016/j.jcis.2014.12.045
Título revista:Journal of Colloid and Interface Science
Título revista abreviado:J. Colloid Interface Sci.
ISSN:00219797
CODEN:JCISA
CAS:montmorillonite, 1318-93-0, 61029-13-8; picloram, 1918-02-1; aluminum silicate, 12183-80-1, 1302-93-8, 1318-74-7, 1335-30-4, 61027-90-5; bentonite, 1302-78-9; Aluminum Silicates; Bentonite; clay; Herbicides; Picloram; Soil
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00219797_v444_n_p115_MarcoBrown

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Citas:

---------- APA ----------
Marco-Brown, J.L., Trinelli, M.A., Gaigneaux, E.M., Torres Sánchez, R.M. & Dos Santos Afonso, M. (2015) . New insights on the structure of the picloram-montmorillonite surface complexes. Journal of Colloid and Interface Science, 444, 115-122.
http://dx.doi.org/10.1016/j.jcis.2014.12.045
---------- CHICAGO ----------
Marco-Brown, J.L., Trinelli, M.A., Gaigneaux, E.M., Torres Sánchez, R.M., Dos Santos Afonso, M. "New insights on the structure of the picloram-montmorillonite surface complexes" . Journal of Colloid and Interface Science 444 (2015) : 115-122.
http://dx.doi.org/10.1016/j.jcis.2014.12.045
---------- MLA ----------
Marco-Brown, J.L., Trinelli, M.A., Gaigneaux, E.M., Torres Sánchez, R.M., Dos Santos Afonso, M. "New insights on the structure of the picloram-montmorillonite surface complexes" . Journal of Colloid and Interface Science, vol. 444, 2015, pp. 115-122.
http://dx.doi.org/10.1016/j.jcis.2014.12.045
---------- VANCOUVER ----------
Marco-Brown, J.L., Trinelli, M.A., Gaigneaux, E.M., Torres Sánchez, R.M., Dos Santos Afonso, M. New insights on the structure of the picloram-montmorillonite surface complexes. J. Colloid Interface Sci. 2015;444:115-122.
http://dx.doi.org/10.1016/j.jcis.2014.12.045