Study of mechanism of Fe(II) and Cu(II) ions adsorption on bentonite modified with carbon nanotubes
Abstract
The results of study of mechanisms of adsorption of Fe(II) and Cu(II) ions on bentonite modified with carbon nanotubes (CNTs) under high-temperature (550°C) heat treatment are presented. The study is carried out using three fractions of modified bentonite of the Sarigyukh deposit (Republic of Armenia): small (0.001–0.099 mm), medium (0.10–0.99 mm), and coarse (1.0–3.5 mm) fractions. The main adsorption characteristics of bentonite modified with CNTs have been experimentally obtained during high-temperature heat treatment for each of the three fractions with respect to Fe(II) and Cu(II) ions under static conditions. The best adsorption characteristics are achieved with the medium fraction of the modified bentonite, which are amounted to the following values for the iron (copper) ions, respectively: static exchange capacity 0.502 (0.36) mg-eq/g, interfacial distribution coefficient 0.14 (0.13) mg/dm3, and recovery degree 90.1 (87.0)%. Adsorption isotherms have been plotted, and the mechanism of adsorption of Fe(II) and Cu(II) ions by CNT-modified bentonite has been analyzed in the framework of the Langmuir, Freundlich, and Brunauer-Emmett-Teller models. The process of Fe(II) ions adsorption on this sorbent is found to be most accurately described in terms of the Langmuir isotherm, which indicates the predominant formation of monomolecular adsorbate layers on the surface of the sorption material. The adsorption of Cu(II) ions on bentonite modified with CNTs is most closely described in terms of the Freundlich isotherm, which indicates the predominant formation of mixed adsorbent-adsorbate layers.
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