Kinetic Regularities of the Hafnium Dioxide Dissolution in the Alkaline Environment

Abstract

Surface properties of the oxides appear to be an important characteristic of the processes occurring at the metal dioxide/aqueous electrolyte interface. A key component determining dissolution kinetics of the hydrated dioxides is the surface acid-base properties. The paper presents experimental results of studying the HfO₂ suspension dissolution in the acidified aqueous electrolytes with the different potassium chloride concentration. The dioxide acid-base surface characteristics were determined using potentiometric titration of the basic solution with the alkali. Plotting the potentiometric curves made it possible to establish the medium acidity influence on dissolution kinetics of the HfO₂ suspension. Based on the experimental data, the process was mathematically simulated, and the acid-base equilibria constants were computed. Possible equilibria established at the interface were analyzed, and the adsorption parameters were computed. The titrated solution pH influence on the ions' adsorption characteristics was established. Accumulation of the experimental data on simulating acid-base characteristics of the hydrated dioxides makes it possible to interpret more completely their surfaces physicochemical and chemical properties, and could contribute to studying the finely dispersed systems

Please cite this article in English as:

Eliseeva E.A., Berezina S.L., Boldyrev V.S. Kinetic regularities of the hafnium dioxide dissolution in the alkaline environment. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2025, no. 5 (122), pp. 88--99 (in Russ.). EDN: VHPAQG

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