Abstract
Nanoscale magnetite (Fe3O4) and nanocomposite (NC) using meso-2,3-dimercaptosuccinic acid (Fe3O4/DMSA) were synthesized. Acid-base surface properties, size and morphology, colloidal stability, composition were ascertained through potentiometric titration, TEM, ξ-potential measurements, IR spectroscopy for a synthesized sample and modified one. Adsorption of Hg2+ ions on the surface of Fe3O4 and Fe3O4/DMSA was performed from an aqueous medium, the concentration of Hg2+ ions in contact solutions before and after adsorption was determined by UV–Vis spectroscopy in the form of monosubstituted dithizonate (λ = 490 нм). The dependence of the adsorption activity on the initial pH and the pH value of the isoionic point (pHIIP) of the surface was established. Experimental kinetic curves and sorption isotherms were analyzed to fit theoretical models that take into account the processes of chemical interaction in the sorbent-sorbate system. It was established that the adsorption kinetics for Hg2+ ions removal was well explained by the pseudo-second order kinetic model, the equilibrium data could be well described by the Freundlich model. The obtained data can be useful in the creation of magnetically controlled sorption materials for the Hg2+ ions extraction from aqueous solutions.
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