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Composition and formation kinetics of strontium polyvanadates in vanadium(IV,V) solutions

  • Physical Chemistry of Solutions
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Abstract

The phase and chemical compositions of the precipitates forming in the Sr(VO3)2-VOCl2-H2O system in the V4+/V5+ = 0.11–9 range at 80–90°C are reported. At pH 1–3 and V4+/V5+ = 0.25−9, the general formula of the precipitated compounds is Sr x V 4+ y V 5+12−y O31−δ·nH2)(0.37 ≤ x ≤ 1.0, 1.7 ≤ y ≤ 3.0, 0.95 ≤ δ ≤ 2.1). Polyvanadates containing the largest amount of vanadium(IV) are obtained at an initial V4+/V5+ ratio of 9 and pH 1.9. Precipitation from solutions at pH 3 takes place only in the presence of the VO2+ ion, and the highest precipitation rate is observed at V4+/V5+ = 0.11. The process is controlled by a second-order reaction on the polyvanadate surface. Under hydrothermal conditions at 180°C, Sr0.25V2O5·1.5H2O nanorods are obtained from solutions with a V4+/V5+ molar ratio of 0.1 at pH 3. The nanorods, 30–100 nm in diameter and up to 2–3 μm in length, have a layered structure with an interlayer spacing of 10.53 ± 0.08 Å.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Pervomaiskaya ul. 91, Yekaterinburg, 620990, Russia

    N. V. Podval’naya & V. L. Volkov

Authors
  1. N. V. Podval’naya
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  2. V. L. Volkov
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Original Russian Text © N.V. Podval’naya, V.L. Volkov, 2011, published in Zhurnal Neorganicheskoi Khimii, 2011, Vol. 56, No. 12, pp. 2102–2107.

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Podval’naya, N.V., Volkov, V.L. Composition and formation kinetics of strontium polyvanadates in vanadium(IV,V) solutions. Russ. J. Inorg. Chem. 56, 2013–2018 (2011). https://doi.org/10.1134/S0036023611120436

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  • DOI: https://doi.org/10.1134/S0036023611120436

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