The Interaction of Quercetin with Highly Dispersed Alumina in a Water–Ethanol Medium

Resumo

A comprehensive study of the interaction of a natural flavonol, quercetin, with highly dispersed alumina in a water–ethanol medium has been carried out by adsorption and spectral methods. It has been shown that the sorption of quercetin on alumina begins at pH > 2.5 and reaches maximum values in the neutral medium in correlation with the content of nondissociated surface ≡ AlOH groups. The sorption isotherm of quercetin is of H type, which is characteristic for chemosorption. The coincidence between the spectral characteristics of the flavonol on the surface of highly dispersed alumina and in solutions containing Al(III) ions suggests the formation of similar chelate complexes in these systems.