Abstract
Mg–Al layered hydroxide of Mg4Al2(OH)12CO3·3H2O composition with hydrotalcite structure was obtained by solid-phase interaction of AlCl3·6H2O and MgCl2·6H2O with (NH4)2CO3. The sorption properties of the obtained sample with respect to nonferrous metal ions—Co2+, Cu2+, Sr2+, and Cs+—are investigated. Experimental data were processed using the Freundlich and Langmuir sorption equations. It is established that the sorption process of these ions is adequately described by the Langmuir monomolecular adsorption equation (the coefficients of determination R2 of the linear forms of the equations are 0.985–0.999. The capacities of the adsorption monolayer of the synthesized Mg–Al layered hydroxide sample were calculated, amounting to 2.13, 2.21, 1.88, and 3.48 mmol/g with respect to Co2+, Cu2+, Sr2+, and Cs+ ions, respectively, which is in good agreement with the values noted in international practice and the adsorption equilibrium constants. Morris–Weber and Boyd diffusion models, Lagergren pseudo-first-order models, and Ho and McKay pseudo-second-order models were used to model sorption kinetics. It is shown that the sorption process is most accurately described by a pseudo-second-order kinetic model and proceeds in a mixed diffusion mode involving not only the outer surface of the material but also the inner surface of its particles due to their porosity in the sorption process. The obtained values of the sorption capacity of the synthesized material indicate the prospects of its application for the extraction of Co2+, Cu2+, Sr2+, and Cs+ ions from industrial wastewater and for drinking water purification.
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Mayorov, D.V., Kopkova, E.K. Equilibrium and Kinetic Characteristics of the Sorption of Co(II), Cu(II), Sr(II), and Cs(I) Ions on Layered Mg–Al Double Hydroxides. Inorg. Mater. Appl. Res. 14, 368–376 (2023). https://doi.org/10.1134/S2075113323020302
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DOI: https://doi.org/10.1134/S2075113323020302