Abstract
The muscovite mica clay-graphene oxide-maghemite-magnetite (γ-Fe2O3-Fe3O4) composite was first used for the adsorption of caesium(I) and cobalt(II). The presence of clay minerals, graphene oxide, maghemite, and magnetite was detected in the prepared composite by XRD, WD-XRF, Mössbauer spectroscopy, and ATR-FTIR. The SEM and TEM results show that the composite has a layered structure with irregularly shaped pores on the surface. It was found that the adsorption of ions depends on the initial concentration, pH (except for caesium), mass of adsorbent, temperature, and contact time. The maximum adsorption capacity for Cs(I) and Co(II) was 2286 mg/g and 652 mg/g, respectively, and was obtained at concentrations (Cs(I) = 12,630 mg/L; Co(II) = 3200 mg/L), adsorbent mass of 0.01 g, pH (Cs(I) = 7; Co(II) = 5), temperature of 20 ± 1 °C, and contact time of 24 h. The high adsorption capacity of the composite could be due to a diversity of functional groups, a large number of active sites or the multilayer adsorption of caesium and cobalt ions on the surface of the composite. The Freundlich, Langmuir isotherms, and the pseudo-second-order kinetic model better describe the adsorption of these ions on the composite. The adsorption was non-spontaneous endothermic for Cs(I) and spontaneous endothermic for Co(II). The proposed mechanism of adsorption of Cs and Co ions on the composite is complex and involves electrostatic interactions and ion exchange. The ANFIS model proved to be quite effective in predicting the adsorption of Cs(I) and Co(II), as shown by the obtained values of R2, MSE, SSE, and ARE.
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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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Raman Novikau designed the composite, carried out important adsorption experiments, conducted data processing, and wrote the manuscript of the paper. Galina Lujanienė led the research and edited the manuscript. Vidas Pakštas, Martynas Talaikis, Kęstutis Mažeika, Audrius Drabavičius, and Arnas Naujokaitis did the characterisation of the composite. Sergej Šemčuk technical help. All authors read and approved the final manuscript.
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Novikau, R., Lujanienė, G., Pakštas, V. et al. Adsorption of caesium and cobalt ions on the muscovite mica clay-graphene oxide-γ-Fe2O3-Fe3O4 composite. Environ Sci Pollut Res 29, 74933–74950 (2022). https://doi.org/10.1007/s11356-022-21078-0
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DOI: https://doi.org/10.1007/s11356-022-21078-0