NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2015, 6 (4), P. 593–604
Nanodisperse oxide compounds of iron formed in the FeSO4 – KOH – H2O – H2O2 system (4.0 ≤ pH ≤ 13.0)
D. A. Zherebtsov – South Ural State University (National research university), Chelyabinsk, Russia; firstname.lastname@example.org
V. Sh. Mirasov – South Ural State University (National research university), Chelyabinsk, Russia; email@example.com
D. G. Kleschev – South Ural State University (National research university), Chelyabinsk, Russia; firstname.lastname@example.org
E.V. Polyakov – Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia; email@example.com
The regularities of phase formation during oxidation of aqueous solutions of FeSO4 and (or) suspensions of Fe(OH)2 at quasi-constant temperature and pH values have been studied for wide intervals of temperature (20 – 85 °C) and (4.0 – 13.0) of the reaction medium. The produced nanodisperse materials have been examined by X-ray phase analysis, IR spectroscopy, scanning electron microscopy and X-ray fluorescence analysis, as well as by thermogravimetric analysis combined with thermal analysis and mass spectrometric analysis of released gases. The dependences of the phase, chemical and disperse compositions of the formed precipitates on the synthesis parameters have been revealed.
Keywords: FeSO4 solutions; FeOH2 suspensions; hydrogen peroxide oxidation; oxide compounds of iron(III).