Khristenko I. Study of reactant characteristics at the surface layers of complexing silica using surface probing

Investigation objects: state of the environment and reactions in the near-surface layer of complexing chemically modified silicas. Purpose: to describe the influence of the environment and another factors on reactions in the near-surface layer of complexing chemically modified silicas; to develop the approach for the unification of information about surface, obtained by quantitative physical-chemical analysis and surface probing by betaine solvatochromic indicators. Methods: quantitative physical-chemical analysis with measuring pH and pM of solution, residual concentration of sorbat in solution; electronic reflection spectroscopy. The influence of surface topography, nature and concentration of background electrolyte, temperature, energetic inhomogeneity on composition and stability constants of surface compounds has been studied. The approach for the estimation of acidity and polarity of the near-surface layer of complexing chemically modified silicas was developed. It combines the quantitative physico-chemical analysis and surface probing by the betaine solvatochromic indicators. Degree of application: the quantitative data obtained can be used for determining conditions of concentration and separation of metallic ions and finding of optimal conditions application of materials in hybrid analysis methods.