Influence of the structure of natural cinnamic acids on their interaction with highly dispersed aluminum oxide in aqueous medium

1Lipkovska, NO
1Barvinchenko, VM
1O. O. Chuiko Institute of Surface Chemistry of the NAS of Ukraine, Kyiv
Dopov. Nac. akad. nauk Ukr. 2020, 9:68-76
Section: Chemistry
Language: Ukrainian

The regularities of the sorption and spectral changes of natural cinnamic acids upon the interaction with highly dispersed aluminum oxide in the aqueous medium depending on the adsorbate chemical nature and the solution pH are established. It is found that the pH dependences of the sorption of cinnamic, coumaric and ferulic acids are described by the same type of curves, and the position of their maxima on the pH scale corresponds to the values of the thermodynamic dissociation constants of the carboxyl groups of these acids (pKCOOH = =4.4-4.6). It is shown that the pH dependence of the caffeic acid sorption at pH <4.5 is similar to the other acids studied, and the expansion of the pH range of maximum sorption to the alkaline region is due to the formation of a surface chelate complex with Al (III).

Keywords: caffeic acid, cinnamic acid, coumaric acid, ferulic acid, highly dispersed alumina, sorption

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