Abstract
Comprehensive adsorption and spectral studies are performed for the interaction between caffeic acid and pyrogenic alumina in aqueous solutions. It is shown that sorption begins at pH >2.5 and reaches its maximum values in a neutral medium. The sorption isotherm of caffeic acid is the H-type isotherm characteristic of chemisorption. It is found that adsorption proceeds according to two mechanisms simultaneously: due to interaction between the surface groups of the sorbent and (a) the carboxyl group of caffeic acid or (b) the ortho-hydroxyl group of the acid to form a chelate complex, the relative fraction of which grows along with the pH of the solution.
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Lipkovskaya, N.A., Barvinchenko, V.N. Sorption of Caffeic Acid on Pyrogenic Alumina from Aqueous Solutions. Russ. J. Phys. Chem. 95, 1693–1697 (2021). https://doi.org/10.1134/S0036024421080173
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DOI: https://doi.org/10.1134/S0036024421080173