Estudio por DRX de la intercalación–pilarización de un mineral de arcilla tipo 2:1 con especies polioxocatiónicas de aluminio
XRD study on the intercalation–pillaring of a 2:1 clay mineral with aluminum polyoxocationic species
J. G. Carriazo1*, M–J. Saavedra2 y M–F. Molina1
1 Departamento de Química, Universidad Nacional de Colombia, Carrera 30 No. 45–03. Bogotá–Colombia. *Autor para la correspondencia. E–mail: jcarriazo@unal.edu.co Fax: 057–1–3165220
2 Departamento de Química, Universidad Pedagógica Nacional, Calle 72 No. 11–86. Bogotá–Colombia.
]]>Recibido 16 de Mayo 2009
Aceptado 7 de Agosto 2009
Resumen
El presente trabajo muestra la intercalación–pilarización exitosa de un mineral tipo esmectita (bentonita) con especies polioxocatiónicas de aluminio empleando soluciones precursoras de nitrato básico, la obtención en estado sólido del agente pilarizante y su caracterización por difracción de rayos X (DRX). La intercalación–pilarización del mineral procede mediante la inserción inicial de policationes con tamaño aproximado de 9.6 Å y la posible formación de fase γ–AlOOH luego de la calcinación. La caracterización del agente pilarizante, obtenido de la solución precursora de nitrato de aluminio en medio básico, permite identificar especies cristalinas cuyos patrones de difracción revelan la presencia probable del ión ε–keggin (nitrato de ε–keggin).
Palabras clave: arcilla pilarizada, ión keggin, intercalación–pilarización, esmectita.
Abstract
This work shows the successful intercalation–pillaring of a smectite–type clay mineral (bentonite) with aluminum polyoxocationic species by precursor solutions from basic nitrate, as well as the preparation in solid state of the pillaring agent and its characterization by X–ray diffraction (XRD). The intercalation–pillaring process is carried out through the initial insertion of polycations around 9.6 Å in size and the possible formation of γ–AlOOH after calcined. Characterization of the pillaring agent obtained by direct way from precursor solution (basic aluminum nitrate) allowed the identification of crystalline species whose diffraction patterns show the possible occurrence of the ε–keggin ion (ε–keggin nitrate).
]]> Keywords: pillared clay, keggin ion, intercalation–pillaring, smectite.
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