Abstract
The adsorption of acridine diaminoderivatives on the surface of finely dispersed silica from aqueous solutions is studied in relation to pH, ionic strength, and adsorbate concentration. The stability constants of the surface complexes of acridine derivatives with unionized and dissociated silanol groups of silica are calculated within the framework of the electrostatic model of surface complexation (the basic Stern model). Dimerization of all examined compounds in aqueous solutions is taken into account. It is established that, in the case of acridine dyes (orange and yellow), complexes containing both monomeric and dimeric forms of these compounds are formed on silica surface. The selection in favor of one of the possible sets of the constants, which quantitatively characterize the equilibria of the reactions, results from the analysis of the adsorption isotherms of examined diaminoacridines.
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