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SYNTHESIS OF MAGNETOACTIVE COMPOUND BASED ON REDOX INTERACTIONS OF IRON(II) CATIONS WITH PERMANGANATE IONS
Abstract
The interaction of permanganate ions with iron(II) cations as the basis for the synthesis of a composite magnetoactive compound has been studied. The reaction was carried out in an acidic medium, for this purpose an iron(II) sulfate solution was prepared with the addition of sulfuric acid. Condensation was carried out using an alkaline reagent after the redox reaction. The influence of the consumption of potassium permanganate on the magnetic activity of the reaction product has been experimentally studied. Theoretically for synthesis of magnetite phase is required to oxidize of 2/3 iron(II) cations, that corresponds a molar ratio of 0.133 mol of potassium permanganate per 1 mol of iron(II) sulfate. It turned out that the product has the maximum magnetic activity if it was synthesized at a consumption of 0.11?0.165 mol of potassium permanganate per 1 mol of iron(II) sulfate. Various alkaline reagents were used for condensation. The effectiveness of alkaline reagents for condensation decreases in the order: tetramethylammonium hydroxide > tetraethylammonium hydroxide > ammonia > sodium hydroxide. The suspension is formed immediately upon the addition of a condensation alkaline reagent. The suspension precipitates with time. Sedimentation occurs much faster under the conditions of an external magnetic field than under natural conditions. The formation of the magnetic activity of the condensation product occurs gradually. Magnetic activity rapidly (for 10?15 min) reaches high values in the region close to optimal. After 48 h they increase by additional 2...40%. Magnetic activity of products synthesized outside the optimal range of the potassium permanganate consumption increases in 2...5 times for 48 h. The increase in temperature leads to an increase in the rate of magnetic activity formation. To synthesize the composite magnetoactive compound waste - spent solutions from etching ferrous metals can be used. The synthesis method can be attributed to green technologies, since after separation of the magnetoactive compound waste water contains components that are useful for agricultural crops.
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