Characterization of the Solids Obtained by Pillaring of Griffithite (High Iron Content Saponite) with Al-Oligomers

Miguel Angel Vicente1, Mercedes Suarez2, Miguel Angel Bañares-Muñoz1 and Jose Martin-Pozas2
1 Departamento de Química Inorgánica, Facultad de Química, Universidad de Salamanca, Plaza de la Merced S/N, 37008-Salamanca, Spain
2 Area de Mineralogía y Cristalografía, Departamento de Geología, Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced S/N, 37008-Salamanca, Spain

Abstract: Griffithite, a high Fe content saponite (Griffith Park, California) was pillared with Al polymeric solutions, using different Al/clay ratios. The cation exchange began when Al-polycation solutions were added, being completed during the dialysis of the samples. Pillared solids were obtained by calcination of intercalated precursors at 500 °C. The content of Al2O3 increased from 7.35% in the natural griffithite to about 14% in the pillared samples, equivalent to the fixation of about 1.4 mmol Al per g of clay. The surface areas of the pillared griffithite were between 230–300 m2 g−1. The intercalation and pillaring of griffithite were easier than that of a less-crystalline nonferrous saponite.

Key Words: Al13-Keggin Polycation • Griffithite • Iron-Saponite • Pillaring • Porosity • Saponite

Clays and Clay Minerals; October 1997 v. 45; no. 5; p. 761-768; DOI: 10.1346/CCMN.1997.0450514
© 1997, The Clay Minerals Society
Clay Minerals Society (www.clays.org)