Glyphosate adsorption on montmorillonite: An experimental and theoretical study of surface complexes

In this study we perform X-ray diffraction and XPS analysis to study the adsorption of the herbicide glyphosate on montmorillonite. Structures of the surface complexes are proposed based on the XPS and XRD patterns and explored using molecular modeling techniques. Adsorption isotherms showed multist...

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Autor principal: Khoury, G.A
Otros Autores: Gehris, T.C, Tribe, L., Torres Sánchez, R.M, dos Santos Afonso, M.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2010
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100 1 |a Khoury, G.A. 
245 1 0 |a Glyphosate adsorption on montmorillonite: An experimental and theoretical study of surface complexes 
260 |c 2010 
270 1 0 |m dos Santos Afonso, M.; INQUIMAE and Departamento de Química Inorgánica, Analítica y Química Física, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria Pabellón II 3er Piso, C1428EHA Buenos Aires, Argentina; email: dosantos@qi.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a In this study we perform X-ray diffraction and XPS analysis to study the adsorption of the herbicide glyphosate on montmorillonite. Structures of the surface complexes are proposed based on the XPS and XRD patterns and explored using molecular modeling techniques. Adsorption isotherms showed multistep profiles at all pHs studied, indicating the adsorption on aluminol and/or silanol groups of the external surface and in the interlayer space. PMG intercalation was indicated by the XRD patterns. The increase of the basal spacing as a function of the number of water molecules in the calculations indicated the appropriateness of the theoretical model to simulate macroscopic behaviors of the water/clay mineral interactions. Final conformations of the system determined by molecular mechanics indicated that the charged amino moiety was attracted by the negative surfaces of the interlayer space in absence or presence of water molecules, with marked pH dependence. Negative values of the estimated adsorption energies at all pH values studied suggested that glyphosate molecules were adsorbed via the amino moiety or through monodentate or bidentate complexes formed between the phosphonate moiety and the internal surfaces of the clay mineral, explaining the basal spacing changes at high concentrations of PMG. © 2010 Elsevier B.V.  |l eng 
593 |a Division of Science, The Pennsylvania State University, Berks Campus, Tulpehocken Rd., Reading, PA 19610, United States 
593 |a Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), Cno. Centenario y 506, Gonnet 1897, Argentina 
593 |a INQUIMAE and Departamento de Química Inorgánica, Analítica y Química Física, Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria Pabellón II 3er Piso, C1428EHA Buenos Aires, Argentina 
690 1 0 |a ADSORPTION 
690 1 0 |a CLAY MINERAL 
690 1 0 |a GLYPHOSATE 
690 1 0 |a HERBICIDE 
690 1 0 |a MONTMORILLONITE 
690 1 0 |a ADSORPTION ENERGIES 
690 1 0 |a ALUMINOL 
690 1 0 |a AMINO MOIETY 
690 1 0 |a BASAL SPACING 
690 1 0 |a BIDENTATE COMPLEXES 
690 1 0 |a EXTERNAL SURFACES 
690 1 0 |a GLYPHOSATES 
690 1 0 |a HERBICIDE GLYPHOSATE 
690 1 0 |a HIGH CONCENTRATION 
690 1 0 |a INTERLAYER SPACES 
690 1 0 |a INTERNAL SURFACES 
690 1 0 |a MACROSCOPIC BEHAVIORS 
690 1 0 |a MINERAL INTERACTIONS 
690 1 0 |a MOLECULAR MODELING TECHNIQUES 
690 1 0 |a MONODENTATES 
690 1 0 |a MONTMORILLONITE 
690 1 0 |a MULTI-STEP 
690 1 0 |a NEGATIVE VALUES 
690 1 0 |a PH DEPENDENCE 
690 1 0 |a PH VALUE 
690 1 0 |a PHOSPHONATES 
690 1 0 |a PRESENCE OF WATER 
690 1 0 |a SILANOL GROUPS 
690 1 0 |a SURFACE COMPLEX 
690 1 0 |a THEORETICAL MODELS 
690 1 0 |a THEORETICAL STUDY 
690 1 0 |a WATER MOLECULE 
690 1 0 |a XPS 
690 1 0 |a XPS ANALYSIS 
690 1 0 |a XRD PATTERNS 
690 1 0 |a ADSORPTION 
690 1 0 |a COMPLEXATION 
690 1 0 |a DYES 
690 1 0 |a HERBICIDES 
690 1 0 |a MINERALS 
690 1 0 |a MOLECULES 
690 1 0 |a SILICATE MINERALS 
690 1 0 |a WEED CONTROL 
690 1 0 |a X RAY DIFFRACTION 
690 1 0 |a X RAY DIFFRACTION ANALYSIS 
690 1 0 |a X RAY PHOTOELECTRON SPECTROSCOPY 
690 1 0 |a CLAY MINERALS 
690 1 0 |a ADSORPTION 
690 1 0 |a COMPUTER SIMULATION 
690 1 0 |a CONCENTRATION (COMPOSITION) 
690 1 0 |a EXPERIMENTAL MINERALOGY 
690 1 0 |a GLYPHOSATE 
690 1 0 |a ISOTHERM 
690 1 0 |a MICROSTRUCTURE 
690 1 0 |a MONTMORILLONITE 
690 1 0 |a NUMERICAL MODEL 
690 1 0 |a THEORETICAL STUDY 
690 1 0 |a X-RAY DIFFRACTION 
690 1 0 |a X-RAY SPECTROSCOPY 
650 1 7 |2 spines  |a PH 
700 1 |a Gehris, T.C. 
700 1 |a Tribe, L. 
700 1 |a Torres Sánchez, R.M. 
700 1 |a dos Santos Afonso, M. 
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