Collect. Czech. Chem. Commun. 1982, 47, 1069-1077

Hydrolytic products of Fe(III) after oxidation of Fe(II) by chlorate

Karel Mádlo, František Hanousek, Antonín Petřina and Jaroslav Tláskal

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 250 68 Řež


Ferrous sulphate was oxidized by potassium chlorate in the pH region 2-7 and at temperatures ranging from 298.1 to 323.1 K and various hydrolytic products of Fe(III) were separated and indentified. The separated solid ferric products were analyzed using a combination of the chemical analysis, IR spectroscopy, X-ray diffraction, and electron microscopy. The following substances were found as major components of the products: Fe2O3.n H2O ("ferric gel"), Fe2O3.n H2O with bound SO2-4 ions ("sulphogel"), α-FeO(OH), γ-FeO(OH) and Fe3O4. Their amount depends particularly on the pH temperature of the reaction medium.