Abstract
Formation of interlayer complexes of 2:1 lattice type clay minerals with KC2H3O2 was investigated by x-ray analysis. The basal spacing of the Na-or K-saturated montmorillonite increased from 12 A to 15 A when the increasing amounts of KC2H3O2 were added and air-dried. No further expansion of the spacing occurred even if KC2H3O2 was added in a greater amount. The 15 A spacing of KC2H3O2-added montmorillonite contracted to 13.6 A by heating at 150-200°C, whereas the spacing of Kor Na-saturated (salt free) one contracted to 10 A. The rate of the salt addition required for the development of the 15 A spacing was 3.5 and 2 m. mols perg clay for Na-and K-saturated montmorillonites, respectively, and this difference may be correlated with the CEC value 1.2 me perg clay. It was concluded that the complex, “montmorillonite-K+-KC2H3O2”, was formed and that KC2H3O2 formed a monolayer in the interlayer region of the mineral. Vermiculite also formed a similar interlayer complex with KC2H3O2, but illite and chlorite did not.
