SORPTIVE EXTRACTION OF IONIC FORMS OF СOPPER(II) FROM AQUEOUS SOLUTIONS BY A MAGNETICALLY SENSITIVE NANOCOMPOSITE WITH A HYDROXYAPATITE SURFACE
DOI:
https://doi.org/10.32782/naturaljournal.10.2024.6Keywords:
magnetite, hydroxyapatite, ionic forms of сopper(II), ion sorption, sorption kinetics, sorption isotherms, surface chemistry, colloidal chemistryAbstract
In the work, nanosized magnetite was synthesized by the Elmore method and its structure was investigated by a set of physicochemical methods. It was determined that the average size of the crystallites is 3–23 nm, the particles are spherical and capable of aggregation. Modification of the magnetite surface with nanosized hydroxyapatite using the sol-gel method was carried out, and a comparative analysis of the sorption activity of the resulting nanocomposite was carried out. It was found that at pH = 7.5, the degree of extraction of ionic forms of Copper(II) for Fe3O4 is 64.7%, and for Fe3O4/HA 87.5%, respectively. The best sorption of ionic forms of Copper(II) occurs in the pH range of 6.5–8.5. It was determined that in the first 30 minutes from the beginning of contact, more than 50% of the ionic forms of Copper(II) are removed from the solution by both surfaces, and the maximum value is reached after 60 minutes from the beginning of contact. Sorption equilibrium occurs after 75 minutes of sorbate-sorbent contact. It was established that the kinetic dependences are adequately described by the pseudo-second-order model. It is shown that the nature of the isotherm curves resembles the Langmuir isotherm curves (L2 – type) according to the Giles classification with saturation. The sorption capacity is 21.6 and 29.2 mg/g for Fe3O4 and Fe3O4/HA, respectively. It was determined that for both surfaces the sorption isotherm of the ionic forms of Copper(II) is described by the Langmuir model. This means that the sorption of ionic forms occurs on homogeneous (homogeneous) centers of the surface, where all active centers are energetically homogeneous and only a monomolecular layer of sorbate can form on the surface. Based on thermodynamic calculations of the Gibbs energies of the sorption process under standard conditions, it was determined that the sorption of ionic forms of Copper(II) from aqueous solutions by both surfaces is spontaneous, and the value of the heat of sorption indicates a purely physical sorption of ionic forms from solutions by Fe3O4 and Fe3O4/HA surfaces. The perspective of the Fe3O4/HA nanocomposite as a sorbent of ionic forms of Сopper(II) is shown.
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