La paligorskita de Pontezuela como nanoreactor para obtener materiales carbonáceos tipo grafeno/arcilla.

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Bibliographic Details
Title:	La paligorskita de Pontezuela como nanoreactor para obtener materiales carbonáceos tipo grafeno/arcilla.
Authors:	Danguillecourt-Alvarez, Edelio¹, Santina-Mohallem, Nelcy Della², Huertemendia-Marin, Moises³, Pérez-Cappe, Eduardo⁴, Mosqueda-Laffita, Yodalgis⁴ yodalgis@imre.oc.uh.cu
Source:	Revista CENIC Ciencias Quimicas. 2016, Vol. 47, p56-63. 8p.
Subjects:	PALYGORSKITE, SEMICONDUCTORS, CLAY, ORE deposits, MINES & mineral resources, GEOCHEMISTRY
Geographic Terms:	CUBA
Abstract (English):	The composition, structure, morphology so as the thermal and textural properties of the clayey fraction from Pontezuela Cuban Mineral Deposit in Camagüey province are studied to evaluate its usefulness as nanoreactor for semiconducting carbonaceous nanomaterial Graphene-like/Clay preparation. The pristine Pontezuela mineral deposit was milled and purified through benefit, by separating the fraction < 2 µm. The elemental chemical composition of the clayey fraction, SiO2 52,66 %; MgO 12,75 %; Al2O3 11,82 %, Fe2O3 7,09 %; K2O 0,8 %; Na2O 0,27 % and CaO 0,19 %, indicate that it corresponds to a mixture of aluminum magnesium hydrated silicates of clayey nature, where the orthorhombic palygorskite is the fundamental phase, accompanied by other clay of the smectite group (montmorillonite) and very little quantities of magnesial chlorite (clinochlore) and quartz, identified by X-ray diffraction technique. The results reveal that clayey phase has a nanofibrous morphology and BET surface area of about 156 g/cm². The BET surface area grows up to 267 g/cm² because of the increase of the mesoporosity when the clayey fraction is heated at 300 °C, being favorable for the semiconducting carbonaceous nanomaterials Graphene-like/Clay synthesis. In a preliminary proof it was possible to demonstrate that the clayey fraction of Pontezuela mine is able to adsorb abundant polysaccharides (40 %) when is previously heated at 300 °C. The quantity and quality of adsorption sites formed in the thermal activation explain that the Graphene-like/clay composite prepared in these conditions shows the highest electronic conductivity (16 S/cm) reported up to now for this kind of material. [ABSTRACT FROM AUTHOR]
Abstract (Spanish):	Se estudian la composición, estructura, morfología, propiedades térmicas y texturales de la fracción arcillosa (< 2 µm) del yacimiento cubano de Pontezuela, Provincia de Camagüey, con el fin de evaluar su empleo como nanoreactor para la obtención de nano-materiales carbonáceos semiconductores de tipo grafeno/arcilla. La muestra tal y como se obtuvo del yacimiento fue triturada y purificada mediante beneficio, separando la fracción arcillosa < 2 µm. La composición química de esta fracción expresada en forma de óxidos (SiO2 52,66 %; MgO 12,75 %; Al2O3 11,82 %, Fe2O3 7,09 %; K2O 0,8 %; Na2O 0,27 %, CaO 0,19 %, con una pérdida por ignición de 14,41 %) revela que la misma se corresponde con el de una mezcla de aluminio-magnesio silicatos hidratados de naturaleza arcillosa, donde la paligorskita ortorrómbica constituye la fase fundamental, acompañada de montmorillonita, clinocloro y cuarzo, identificadas todas como fases minoritarias por la técnica instrumental de difracción de rayos X. Los resultados indican que esta fase arcillosa (< 2 µm) presenta una morfología nanofibrosa y área superficial BET de 156 m²/g. El área superficial BET se incrementa a 267 m²/g por desarrollo de la mesoporosidad cuando la fase arcillosa es tratada a 300 °C, lo cual es propicio para la síntesis de materiales carbonáceos nanométricos semiconductores tipo grafeno/arcilla. Una prueba preliminar demostró que la fase arcillosa de Pontezuela adsorbe abundantes polisacáridos (40 %) cuando es previamente activada a 300 °C. La cantidad y la calidad de los sitios de adsorción formados con la activación térmica explican que el compósito grafeno/arcilla preparado en estas condiciones tiene la más alta conductividad electrónica (16 S/cm) reportada hasta ahora para este tipo de material. [ABSTRACT FROM AUTHOR]
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Database:	MedicLatina

Description
Abstract:	The composition, structure, morphology so as the thermal and textural properties of the clayey fraction from Pontezuela Cuban Mineral Deposit in Camagüey province are studied to evaluate its usefulness as nanoreactor for semiconducting carbonaceous nanomaterial Graphene-like/Clay preparation. The pristine Pontezuela mineral deposit was milled and purified through benefit, by separating the fraction < 2 µm. The elemental chemical composition of the clayey fraction, SiO2 52,66 %; MgO 12,75 %; Al2O3 11,82 %, Fe2O3 7,09 %; K2O 0,8 %; Na2O 0,27 % and CaO 0,19 %, indicate that it corresponds to a mixture of aluminum magnesium hydrated silicates of clayey nature, where the orthorhombic palygorskite is the fundamental phase, accompanied by other clay of the smectite group (montmorillonite) and very little quantities of magnesial chlorite (clinochlore) and quartz, identified by X-ray diffraction technique. The results reveal that clayey phase has a nanofibrous morphology and BET surface area of about 156 g/cm². The BET surface area grows up to 267 g/cm² because of the increase of the mesoporosity when the clayey fraction is heated at 300 °C, being favorable for the semiconducting carbonaceous nanomaterials Graphene-like/Clay synthesis. In a preliminary proof it was possible to demonstrate that the clayey fraction of Pontezuela mine is able to adsorb abundant polysaccharides (40 %) when is previously heated at 300 °C. The quantity and quality of adsorption sites formed in the thermal activation explain that the Graphene-like/clay composite prepared in these conditions shows the highest electronic conductivity (16 S/cm) reported up to now for this kind of material. [ABSTRACT FROM AUTHOR]
ISSN:	10158553