Physicochemical Properties of Condensed Products of Interaction between Iron(II) Cations and Permanganate Ions

Abstract

Condensed products are obtained via the partial oxidation of iron(II) cations using potassium permanganate, and their physicochemical properties are studied. Samples obtained at a potassium permanganate-to-iron(II) molar ratio close to stoichiometric in a preparation of magnetite have the greatest relative magnetic susceptibility. It is shown that the initial rate of formation of relative magnetic susceptibility in the range of 30–70°C depends linearly on the inverse thermodynamic temperature. Sedimentation of the synthesized products upon exposure to an external magnetic field is complete within 1–1.5 min. Diffractometry shows that crystalline magnetite samples form at a KMnO4 : Fe(II) molar ratio of 0.08–0.18. Magnetic granulometry reveals they have superparamagnetic properties. Under conditions of static sorption, the degree of extraction of chromate ions is 98.7%.