ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Hydrothermal synthesis of montmorillonite containing iron in structure

J. Masár, V. Luptáková, Ľ Kuchta, and V. Š. Fajnor

Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, CS-84215 Bratislava

Abstract: A method of hydrothermal synthesis of montmorillonite containing iron in structure was elaborated. The starting substances of this synthesis were gel-like amorphous oxides Si0₂, Al₂0₃, MgO, and Fe₂0₃ (T= 573 К , p = 8.8 M Pa, and t = 6 days) and the method was verified for 22 different ratios of mass amounts of the starting oxides. It has been found that the atoms of iron are built in layers of mineral and do not occur in exchangeable positions. An occupation of the octahedron centres in structure by the Fe(III) atoms brings about a decrease in temperature of high-temperature transformations of montmorillonite. The exchange capacity for cation equivalents of the synthetic mineral is in the interval 0.96—1.31 mol kg^-1 and besides the Mg²⁺ ions the Al³⁺ cations are also present in exchangeable positions. The value of specific surface is about 800 m₂ g^-1

Full paper in Portable Document Format: 413a343.pdf

Chemical Papers 41 (3) 343–350 (1987)