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Dependence of the surface charge and the fluorine adsorption by γ-aluminum oxide on the solution temperature

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Abstract

The dependence of the surface charge of the γ-aluminum oxide and the fluorine adsorption on the solution temperature (20, 30, and 40°C), the pH (3.5–10), and the equilibrium concentration of fluorine in the solution (from 1.0 × 10−3 to 1.5 × 10−1 M/l) is studied by the method of potentiometric titration and adsorption variations with the view to elucidate the nature of the processes that take place upon the removal of fluorine with the use of ECDM sludge of an aluminum alloy that was calcined at a temperature of 800 °C. The adsorption isotherms were processed using the Freundlich, Langmuir, and BET equations. The best coincidence with the experimental data is obtained with the use of the Langmuir equation. It is shown that both the solution temperature increase and the amount of fluorine adsorbed by the sample surface shift the pHPZC to a more acid range. The fluoride adsorption occurs due to the exchange of the OH−-groups of the hydrated oxide surface for fluorine ions due to the interaction of the charged AlOH +2 centers of the surface with F− ions and due to the formation of hydrogen bonds of F− and uncharged AlOH centers.

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Authors and Affiliations

  1. Institute of Applied Physics, Academy of Sciences of Moldova, ul. Academiei 5, Chisinau, MD-2028, Republic of Moldova

    T. Ya. Datsko & V. I. Zelentsov

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  1. T. Ya. Datsko
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  2. V. I. Zelentsov
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Correspondence to T. Ya. Datsko.

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Original Russian Text © T.Ya. Datsko, V.I. Zelentsov, 2009, published in Elektronnaya Obrabotka Materialov, 2009, No. 5, pp. 65–73.

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Datsko, T.Y., Zelentsov, V.I. Dependence of the surface charge and the fluorine adsorption by γ-aluminum oxide on the solution temperature. Surf. Engin. Appl.Electrochem. 45, 404–410 (2009). https://doi.org/10.3103/S1068375509050111

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  • DOI: https://doi.org/10.3103/S1068375509050111

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