Isotherms of the Sorption of Fe2+, Fe3+ Ions by Industrial Waste from Aqueous Solutions

The purpose of this work was to study the isotherms of the process of sorption of Fe2+, Fe3+ ions by industrial waste from aqueous solutions.
Methods. As a sorbent, technogenic wastes from sugar production (defecation mud of Lgovsky Sugar Plant JSC), leather industry (chrome shavings from the Kursk Tannery OOO Kursk Kozha) and aviation instrumentation enterprises (galvanic sludge from Aviaavtomatika JSC named after V.V. Tarasova"). Fe2+, Fe3+ ions were chosen as sorbates, since the problem of iron removal is especially relevant for the Kursk region, due to the conditions of formation and the peculiarities of the formation of natural and waste waters.
As a scientific basis for the study of sorption, thermodynamic approaches are proposed, according to which sorption properties can be estimated by the value of the maximum working value of the transfer of a substance from a solution to the surface of sorbents. The mathematical models of Langmuir and Freindlich were used to describe the sorption isotherms. To determine the residual content of Fe2+, Fe3+ ions, calibration plots of the dependence of optical density on the concentration of Fe2+, Fe3+ ions in aqueous solutions were constructed using the sulfosalicylate photometric method.
Results. According to the equations of Freundlich and Langmuir sorption isotherms, the sorption isotherms were processed and analyzed, and the parameters of the process of sorption of Fe2+, Fe3+ ions by production waste from aqueous solutions were determined. The spontaneity of this process is established.
Conclusion. The results obtained showed the suitability of production waste as an inexpensive sorbent for the effective removal of Fe2+, Fe3+ ions from aqueous solutions in the range from 0.8636 to 8.636 g/dm3.
It has been established that the sorption of Fe2+, Fe3+ ions on production waste occurs in the form of monolayer sorption on the surface, which is homogeneous in sorption affinity and is described by Langmuir isotherms, which is confirmed by a high value of the confidence approximation (R2 = 0.9909-0.9955).
In the course of the work, it was found that galvanic sludge and defecation exhibit the greatest sorption capacity.

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