Pylypenko I.V.

Cleaning of Contaminated Waters Against U and Cr Compounds Using Pillared Al- and Al/Fe-Clays

In this paper a comprehensive study of adsorption properties of modified clay minerals with polyoxocomplexes (POM) of iron and aluminium with regard to removal of heavy metal ions from an aqueous medium was carried out. To determine changes in structure characteristics of the intercalated minerals have been used methods of X-ray diffraction, nitrogen adsorption with calculated specific surface area and pore size distribution, as well as adsorption of Chromium (VI) and Uranium (VI) ions from aqueous solutions at various pH values.

Structure Formation in Dispersions of Montmorillonite in the Presence of Quaternary Ammonium Salts

The aim is to study the influence of cationic surfactants – quaternary ammonium salts – for structure formation in montmorillonite suspensions by studying the rheological and colloidal-chemical properties of such systems. Relying on x-ray diffraction analysis we identify surfactant molecules close to a parallel position relative to the basal surface of mineral with the interlayer space of 1.6 nm. By using rheometry we obtain flow curves and corresponding values of boundary shear stress for dispersions of montmorillonite in the presence of cationic surfactants.