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Sorption of [Fe(CN)6]3− and [Fe(CN)6]4− ions on the surface of Fe(III), Cr(III), and Zr(IV) oxyhydroxide hydrogels from aqueous solutions

  • Physical Chemistry of Surface Phenomena
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Abstract

The sorption of [Fe(CN)6]3− and [Fe(CN)6]4− anions on the surface of Fe(III), Cr(III), and Zr(IV) oxyhydroxide hydrogels at various pH values of hydrogel precipitation from solutions without a support electrolyte and from NaCl and Na2SO4 solutions with an ionic strength of 0.5 was studied. It was found that isotherms of sorption of [Fe(CN)6]3− and [Fe(CN)6]4− anions from solutions without a support electrolyte and from NaCl solutions and those of sorption of [Fe(CN)6]4− from Na2SO4 solutions are described by the Langmuir equation. It was established that the sulfate background suppresses the sorption of [Fe(CN)6]3− on Fe(III) and Zr(IV) oxyhydroxides. Both anions are sorbed only when the surface of the oxyhydroxides is charged positively; the Langmuir equation parameters A max and K tend to decrease to the point of zero charge as the pH value of oxyhydroxide precipitation increases. An electrostatic mechanism of the sorption of [Fe(CN)6]3− and [Fe(CN)6]4− anions was suggested.

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Authors and Affiliations

  1. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center, Russian Academy of Sciences, Apatity, Russia

    S. I. Pechenyuk, Yu. P. Semushina & L. F. Kuz’mich

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  1. S. I. Pechenyuk
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  2. Yu. P. Semushina
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  3. L. F. Kuz’mich
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Original Russian Text © S.I. Pechenyuk, Yu.P. Semushina, L.F. Kuz’mich, 2006, published in Zhurnal Fizicheskoi Khimii, 2006, Vol. 80, No. 10, pp. 1902–1907.

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Pechenyuk, S.I., Semushina, Y.P. & Kuz’mich, L.F. Sorption of [Fe(CN)6]3− and [Fe(CN)6]4− ions on the surface of Fe(III), Cr(III), and Zr(IV) oxyhydroxide hydrogels from aqueous solutions. Russ. J. Phys. Chem. 80, 1692–1697 (2006). https://doi.org/10.1134/S0036024406100268

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  • DOI: https://doi.org/10.1134/S0036024406100268

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