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In this work, we report on an approach to the description of acid–base equilibria of 8-hydroxyquinoline-modified silica gels, influencing both the effect of the double layer and competing processes at the interface. The samples were synthesized by the Mannich reaction. The surface density of the grafted groups was determined. The curves of acid–base titration of the modified silica gels were received by us and have been converted to charge density pH-dependent curves. These curves were used to carry out the fitting procedure. The ionic equilibria of surface groups, processes of interaction of surface groups with each other and the Diffuse Double Layer Model, considering the molecular and ionic forms on the surface, were used to describe protolytic equilibria. Within the applied model, the behavior of counterions in the surface layer and the surface equilibrium constants were assessed. The ionic equilibria of protolithic groups constants values were close to the ionization constants of homogeneous analogs.
Journal of the Iranian Chemical Society – Springer Journals
Published: Sep 1, 2022
Keywords: Modified silica; 8-hydroxyquinoline; Surface complexation; Diffuse double layer model
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