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Journal of the Mexican Chemical Society
versión impresa ISSN 1870-249X
J. Mex. Chem. Soc vol.50 no.1 Ciudad de México ene./mar. 2006
Article
Synthesis of intercalated Al-hydroxy-montmorillonite
M. Lourdes Chávez-García,1* Liberto de Pablo-Galán,2 M. Pilar Saucedo-Ramírez1
1 Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510. México, D.F. Tel.: (5255) 5622-3505; fax (5255) 5622-3531, e-mail: *marilu@servidor.unam.mx
2 Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510. México, D.F.
Recibido el 21 de agosto del 2005.
Aceptado el 24 de marzo del 2006.
Abstract
Montmorillonite from Durango, Mexico, of composition (Si3.88Al0.12)(Al1.41Mg0.59)O10(OH)2(Ca0.07Mg0.11Na0.28K0.06), surface area 42.07 m2g-1, d001 spacing 12.50 Å, and pore volume 0.002 cm3g-1, was intercalated with Al-hydroxy oligomer. The modified clay developed a surface area of 287.86 m2g-1, pore volume of 0.103 cm3g-1, and d001 spacing of 18.70 Å. Dehydration to 70 °C shift the d001 spacing to 17.29 Å; dehydroxylation started at 150 °C and by 300 °C had lost 1.92 w% and reduced the d001 spacing to 17.34 Å.
Keywords: Intercalated aluminum montmorillonite, clays, silicates, oligomer.
Resumen
Montmorillonita procedente de Durango, México, de composición (Si3.88Al0.12)(Al1.41Mg0.59)O10(OH)2(Ca0.07Mg0.11Na0.28K0.06) ,área superficial 42.07 m2g-1, espaciamiento d001 12.50 Å, y volumen de poro 0.002 cm3g-1, fue intercalada con el oligómero de Al. La arcilla modificada desarrolló un área superficial de 287.86 m2g-1, volumen de poro 0.103 cm3g-1, y espaciamiento d001 18.70 Å. Se deshidrata a 70 °C reduciendo el espaciamiento d001 a 17.29 Å; su deshidroxilación se inicia a 150 °C y a 300 °C perdió 1.92 % en peso, modificando d001 a 17.34 Å.
Palabras clave: Montmorillonita intercalada con aluminio, arcillas, silicatos, oligómero.
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Acknowledgements
The authors acknowledge the support of DGAPA UNAM through Project IN102798. They also thank to M. Portilla, C. Salcedo-Luna, M. Gutiérrez, and A. Marturano for their analytical work.
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