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.
Similar content being viewed by others
References
Choi, W.-W. and Chen, K. Y. The Removal of Fluoride from Waters by Adsorption, J. Am. Water Works Assoc., 1979, vol. 71, p. 562.
Krishna Biswas, Sanat Kumar Saha, and Uday Chand Ghosh*, Adsorption of Fluoride from Aqueous Solution by a Synthetic Iron(III)-Aluminum(III) Mixed Oxide, Ind. Eng. Chem. Res., 2007, vol. 46, no. 16, p. 5346.
Subhashini Ghorai and Pant, K.K., Equilibrium, Kinetics and Breakthrough Studies for Adsorption of Fluoride on Activated Alumina, Sep. Purif. Technol., 2005, vol. 42, no. 3, p. 265.
Hao, O.J. and Huang, C.P., Adsorption Characteristics of Fluoride onto Hydrous Alumina, J. Environ. Eng., 1986, vol. 112, no. 6, p. 1054.
Nagendra Rao, C.R. and Karthikeyan, J., Adsorption of Fluoride by Gamma Alumina, XII Int. Water Technol. Conf. IWTC12, Alexandria, Egypt, 2008, p. 141.
Srimurali, M., Pragathi, A., and Karthikeyan, J., A study on Removal of Fluorides from Drinking Water by Adsorption onto Low-Cost Materials, Environ. Pollut., 1998, no. 99, p. 285.
Fan, X., Parker, D.J., and Smith, M.D., Adsorption Kinetics of Fluoride on Low Cost Materials, Water Res., 2003, no. 37, p. 4929.
Sujana, M.G., Thakur, R.S., and Rao, S.B., Removal of Fluoride from Aqueous Solution by Using Alum Sludge, J. Colloid Interface Sci., 1998, vol. 206, pp. 94–101.
Zelentsov, V.I., Datsko, T.Ya., and Dvornikova, E.E., Fluorine Adsorption by Aluminum Oxyhydrates Subjected to Thermal Treatment, Surf. Eng. Appl. Electrochem., 2008, vol. 44, no. 1, p. 64.
Zelentsov, V.I., Datsko, T.Ya., and Dvornikova, E.E., The Effect of Temperature on Equilibrium and Kinetics of Fluoride Adsorption by Thermo Treated AI Oxyhydrates, Surf. Eng. Appl. Electrochem., 2008, vol. 44, no. 3, p. 39.
Young Ku and Hwei-Mei Chiou, The Adsorption of Fluoride Ion from Aqueous Solution by Activated Alumina, Water, Air, Soil Pollut., 2002, vol. 133, no. 1, p. 349.
Bahena J. L. Reyes, Cabrera A. Robledo, Valdivieso A. Lopez, and Urbina R. Herrera, Fluoride Adsorption onto-Al2O3 and its Effect on the Zeta Potential at the Alumina-Aqueous Electrolyte Interface, Sep. Sci. Techn., 1987, vol. 37, no. 8, p. 1973.
Schoeman, J.J. and Botha, G.R., Evaluation of the Activated Alumina Process for Fluoride Removal from Drinking Water and Some Factors Influencing This Performance, Water SA, 1985, vol. 11, no. 1, p. 25.
Yeun C. Wu and Anan Nitya, Water Defluoridation with Activated Alumina, J. Environ. Eng. Div., 1979, vol. 105, no. 2, p. 357.
Berendeeva, V.L., Vakhnin, I.G., and Goronovskii, I.T., The Use of Activated Alumina A-1 for Defluorination of Water, Khim. Tekhnol. Vody, 1985, vol. 7, no. 3, p. 87.
Valdivieso A. Lopez, Bahena J.L. Reyes, Song, S., and Urbina R. Herrera, Temperature Effect on the Zeta Potential and Fluoride Adsorption at the α-Al2O3/Aqueous Solution Interface, J. Colloid Interface Sci., 2006, vol. 298, no. 1, p. 1.
Parks, G.A., and de Bruyn, P.L., The Zero Point of Charge of Oxides, J. Phys. Chem., 1962, no. 66, p. 967.
Peri, J.B. and Hannan, R.B., Surface Hydroxyl Groups of γ-Alumina, J. Phys. Chem., 1960 vol. 64, p.1526.
Peri, J.B., Infrared and Gravimetric Study of the Surface Hydration of γ-Alumina, J. Phys. Chem., 1965, vol. 69, p. 211.
Peri, J.B., A Model for the Surface of γ-Alumina, J. Phys. Chem., 1965, vol. 69, p. 220.
James, R.O. and Parks, G.A., Characterization of Aqueous Colloids by Their Electrical Double-Layer and Intrinsic Surface Chemical Properties, in Surface and Colloid Science, Matijevic, E., Ed., New York: Plenum Press, 1982, vol. 12, p. 119.
Goldberg, Sabine, Davis, James A., and Hem, John D., The Surface Chemistry of Aluminum Oxides and Hydroxides, in The Environmental Chemistry of Aluminum, Sposito, Garrison, Ed., Berkeley: Lewis Publ. Univ. California, 1996, p. 271.
Halter, W.E., Surface Acidity Constants of Alpha Al2O3 between 25 and 70°C, Geochim. Cosmochim. Acta, 1999, vol. 63, nos. 19–20, p. 3077.
Tewari, P.H. and McLean, A.W., Temperature Dependence of Point of Zero Charge of Alumina and Magnetite, J. Colloid Interface Sci., 1972, vol. 40, no. 2, p. 267.
Mustafa, S., Dilara, B., Neelofer, Z., Naeem, A., and Tasleem, S., Temperature Effect on the Surface Charge Properties of γ-Al2O3, J. Colloid Interface Sci., 1998, vol. 204, no. 2, p. 284.
Berube, Y.G. and de Bruyn, P.L., Adsorption at the Rutile-Solution Interface. I. Thermodynamic and Experimental Study, J. Colloid Interface Sci., 1968, vol. 27, no 2, p. 305.
Duke, Catherine V. A., Miller, Jack M, Clark, James H., and Kybett, Adrian P., 19F Mas NMR and FTIR Analysis of the Adsorption of Alkali Metal Fluorides onto Alumina, J. Mol. Catal., 1990, vol. 62, no. 2, p. 233.
Savinelli, E.A. and Black, A.P., Defluoridation of Water with Activated Alumina, J. Am. Water Works Assoc., 1958, vol. 50, no. 1, p. 33.
Lounici, H., Belhocine, D., Grib, H., Drouiche, M., Pauss, A., and Mameri, N., Fluoride Removal with Electro-Activated Alumina, Desalination, 2004, vol. 161, no. 3, p. 287.
Ryazanov, M.A. and Dudkin, B.N., Acid-Base Properties of γ-Al2O3 Suspension Studied by pK-Spectroscopy, Kolloidn. Zn., 2003, vol. 65, no. 6, pp. 831–836 [Colloid J. (Engl. Transl.), vol. 65, no. 6, p. 761].
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © T.Ya. Datsko, V.I. Zelentsov, 2009, published in Elektronnaya Obrabotka Materialov, 2009, No. 5, pp. 65–73.
About this article
Cite this article
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
Received:
Published:
Issue Date:
DOI: https://doi.org/10.3103/S1068375509050111