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Hydrolytic precipitation of calcium polyvanadates from vanadium(IV) and vanadium(V) solutions

  • Physical Chemistry of Solutions
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Abstract

The effect of VO2+ ions on the composition and kinetics of calcium polyvanadate precipitation from solutions with 1.5 ≤ pH ≤ 9 at 80–90°C has been studied. For 1,5 ≤ pH < 3 and V4+/V5+ = 0.11–9, the precipitated compounds have the general formula Ca x V 4+ y V 5+12−y O31−δ · nH2O (0.8 ≤ x ≤ 1.06, 2 ≤ y ≤ 3, 0.94 ≤ δ ≤ 1.5). The maximum vanadium(IV) proportion (y = 3) in the precipitates is achieved when V4+/V5+ = 0.5−1.0 in the solution and pH is 3. Polyvanadate precipitation at pH 1.7 has a long induction period (up to 30 min), which is not observed for V4+/V5+ > 0.1. Precipitation in solutions with pH 3 occurs only when VO2+ ions are added, with a maximum rate near V4+/V5+ = 0.2 and in presence of chloride ions. The processes are controlled by a secondorder reaction on the polyvanadate surface.

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Authors and Affiliations

  1. Institute of Solid State Chemistry, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg, 620219, 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, 2007, published in Zhurnal Neorganicheskoi Khimii, 2007, Vol. 52, No. 9, pp. 1566–1571.

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Podval’naya, N.V., Volkov, V.L. Hydrolytic precipitation of calcium polyvanadates from vanadium(IV) and vanadium(V) solutions. Russ. J. Inorg. Chem. 52, 1468–1473 (2007). https://doi.org/10.1134/S0036023607090276

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  • DOI: https://doi.org/10.1134/S0036023607090276

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