PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LXXVIII 2025

Mykola KOROVIAKOV, Yaroslav KOVALYSHYN, Vasyl KORDAN

Ivan Franko National University of Lviv, Kyryla i Mefodia Str., 6, 79005 Lviv, Ukraine
e-mail: yaroslav.kovalyshyn@lnu.edu.ua

DOI: https://doi.org/10.37827/ntsh.chem.2025.78.206

HYDROTHERMAL SYNTHESIS OF IRON(III) VANADATE

The synthesis of iron vanadates from aqueous solutions was studied at different ratios between the reacting components at a temperature of 40°C. In all cases, after mixing the reacting components, the formation of finely dispersed particles of a solid phase of yellow color was observed. Over time, the color of the precipitate changed from yellow to shades of brown, which are characteristic of iron vanadates. The change in color may indicate changes in the phase and aggregate state of the precipitates formed at the initial moment.
An increase in the molar excess of vanadate or an increase in the pH of the solution contributes to an increase in the mass of the obtained iron vanadates. An increase in the molar ratio of NaVO3 : Fe(NO3)3 within 0.5 − 3 leads to an increase in the mass of the obtained products. At the same time, the proportion of Vanadium atoms also increases. Such results can be explained by the fact that in diluted solutions of sodium vanadate, H2VO4− and HVO42− ions will be formed, which, with an increase in the solution concentration, will pass into VO43−. At a low concentration of NaVO3 and, accordingly, a small molar excess of it, the number of corresponding ions is not sufficient for the formation of di- and trivanadates. An increase in the concentration leads to a general increase in the concentration of H2VO4− ions (HVO42−), their number becomes sufficient for the formation of di- and trivanadates. A further increase in the concentration leads to an increase in the proportion of VO43− ions, which will contribute to the formation of orthovanadate and a decrease in the proportion of Vanadium atoms in the product.
An increase in the amount of added alkali results in an increase in the mass of the obtained product and a decrease in the proportion of Vanadium atoms in it. These results are also due to the transition of H2VO4− and HVO42− ions to VO43− upon addition of NaOH.
At the initial moment of the reaction, the concentration of iron ions in the solution decreases abruptly, then within 1 h a gradual slight decrease in concentration is observed. Subsequently, the concentration does not change significantly. In the case of the initial solutions, for which the smallest amounts of products were obtained, the highest Fe3+ concentration values are observed. With an increase in the molar excess of sodium vanadate in the initial mixture for reaction times greater than 1 h, an inverse relationship is observed between the content of Vanadium atoms in the product and the concentration of iron ions in the solution. The rate constants for different reaction orders and correlation coefficients were calculated when constructing the corresponding linear relationships. No clear linear relationships were obtained, as indicated by the low values of the correlation coefficients in most cases. This fact can be explained by the complexity of the process - vanadate ions in different forms can enter into the interaction, and the reaction will also be accompanied by aggregation and an increase in the size of iron vanadate particles.

Keywords: iron vanadate, heterogeneous reaction, rate constant.

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How to Cite

KOROVIAKOV M., KOVALYSHYN Ya., KORDAN V. HYDROTHERMAL SYNTHESIS OF IRON(III) VANADATE. Proc. Shevchenko Sci. Soc. Chem. Sci. 2025. Vol. 78. P. 206-214.

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