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Nanocomposites based of layered silicate materials: preparation, characterization and functional properties as a tool for sustainable agriculture

AutorGámiz, B. ; Celis, R. ; Hermosín, M.C. ; Cornejo, J.
Fecha de publicación20-may-2014
EditorRobert Gordon University
Consejo Superior de Investigaciones Científicas (España)
CitaciónNANOSTRUC 2014. International Conference on Structural Nano Composites 20-21 May 2014 in Madrid, Spain
ResumenNanomaterials have been recently proposed as a tool to increase the susta inability of agricultural activity and to reduce its environmental impacto The goal of this work was to prepare and characterize a novel functional materíal by the mod ification of SAz-1-montmorillonite with the polymer hexadimethrine (HEXAD) to explore its application in agriculture, i.e., as a strategy to enhance the adsorption of herbicides. Comparative preparation and characterization with the exadecyltrimethylamonium modified SAz-1-montmorillonite (SA-HDTMA) was also performed. The characterization was assessed by elemental analysis, XRD, FTIR, physisorption of N2, scanning electron microscopy (SEM) and Z potential measurements. Both HEXAD and HDTMA were intercalated stoichiometrically into SAz-1, resulting in basal spacing values of 1.4 nm for hexadimethrine-polymer nanocomposite (SA-HEXAD) and 2.8 nm for SA-HDTMA. FTIR analysis indicated the interaction of the polymer by means of alkyl groups of hexadimethrine with the clay surface. These outcomes suggested that the polymer formed a horizontal monolayer exposing positive charges out of the interlayer space of SAz-1, as indicated by the positive Z potential of SA-HEXAD (+13.6 mV), which was in contrast to the negative value recorded for SA-HDTMA (-4.6 mV). Additionally, higher specific surface area was obtained for SA-HEXAD (51 m2 g-l) than for SA-HDTMA (11 m2 g-l) with N2 adsorption isotherms typical for clay-nanomaterials. SEM micrographs showed no significant changes in the morphology of clay minerals upon treatment with the organic cations, suggesting >functional> character due to their different surface properties. Adsorption of several herbicides on SA-HEXAD and SA-HDTMA, was also investigated and related to their tunable properties. SA-HEXAD displayed high affinity for anionic herbicides, which were adsorbed on this nanoclay through ionic forces. SA-HDTMA presented greater adsorption than the original clay (SAz-1) for most of herbicides as a result of hydrophobic interactions
DescripciónComunicación oral presentada en el The 2nd International Conference on Structural Nano Composites (NANOSTRUC 2014) 20-21 May 2014 in Madrid, Spain
Versión del editorhttp://dx.doi.org/10.6084/m9.figshare.1094549
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