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Description of the acid–base equilibria on the 8-hydroxyquinoline-modified silica surface using surface complexation theory

Description of the acid–base equilibria on the 8-hydroxyquinoline-modified silica surface using... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Iranian Chemical Society Springer Journals

Description of the acid–base equilibria on the 8-hydroxyquinoline-modified silica surface using surface complexation theory

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References (30)

Publisher
Springer Journals
Copyright
Copyright © Iranian Chemical Society 2022
ISSN
1735-207X
eISSN
1735-2428
DOI
10.1007/s13738-022-02582-z
Publisher site
See Article on Publisher Site

Abstract

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

Journal of the Iranian Chemical SocietySpringer Journals

Published: Sep 1, 2022

Keywords: Modified silica; 8-hydroxyquinoline; Surface complexation; Diffuse double layer model

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