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THE INTERACTION OF IRON(II) CATIONS WITH CHROMATE ANIONS IN THE PRESENCE OF LIGNOSULFONATES
Abstract
Chromium is widely used in the form of metal and in the form of compounds. The compounds of Cr(VI) are highly toxic. Therefore, the wastewater containing chromium must be thoroughly cleaned by sorption, extraction, electrochemical and biochemicals methods. Methods based on the reduction of Cr(VI) occupy an important place. A large number of reducing agents, including FeSO4, has been proposed for this. Studies carried out earlier showed that during this reaction a magnetoactive compound is formed. Lignosulfonic acids have unique properties that other types of technical lignins do not have. By using them water-based ferrofluids can be synthesized. Therefore, the influence of lignosulfonates on the interaction of Fe(II) cations and K2CrO4 was studied. During the reaction, a complex is formed first. Potentiometry showed that at pH 3.5 the oxidation-reduction potential varies little. For condensation, alkali is added to the reaction mixture. Under these conditions, an insoluble compound precipitates, which falls within a few minutes, and the formation of magnetic activity occurs within 1-1.5 hours. That is, the redox reaction and ferritization occur mainly in the solid phase, and not in solution. Lignosulfonic acids accelerate ferritization. Magnetic activity is formed faster, and in addition its magnitude is greater than in the synthesis of a magnetoactive compound without lignosulfonates. Magnetoactive compound refers to ferrimagnetic compounds. An important result of the research is practically complete deposition of chromium compounds in the form of magnetoactive compound that are easily separated by magnetic separation.
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