Dadashev A. Immobilized on silica polyhexamethyleneguanidinechloride and its derivatives in solid-phase extraction of ions

The thesis is devoted to development of methods of chemical anchorage of polyhexamethyleneguanidinechloride and its derivatives on the silica surface, studies of adsorption properties of synthesized composites. Silica with chemically bound polyhexamethyleneguanidinechloride, its amide with maleic and o-phtalic acids, and carboxymethylated polyhexamethyleneguanidine were obtained via three-stage synthesis using activated with cyanuric chloride amine-containing silica gel. Synthesized composites have been shown to display high enough sorption capacity with respect to metal-containing anions and satisfactory extraction kinetics for transition metals cations. Optimum values of the medium acidity for maximum degree of adsorption of the studied ions by modified silicas have been determined. It was predominantly neutral and weakly-alkaline media for transition metals cations. The highest adsorption of most metal-containing anions was detected from the acidic medium. The method of sorption-photometric qualitative and quantitative determination of transition metals cations (with usage of 4-(2-pyridylazo)resorcinol and 1-(2-pyridylazo)-2-naphthol) and metal-containing anions (with usage of bromopyrogallol red) after preconcentration on the surface of synthesized composites has been proposed. The possibility of X-ray-fluorescence determination of metals microquantities in the sorbent phase after ions extraction from aqueous solution in the static adsorption mode has been shown.