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Inorganic sorbents based on magnesium silicates obtained by two synthetic routes

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Abstract

In the present study, three novel inorganic ion exchange materials based on magnesium silicates were synthesized by precipitation and hydrothermal sol–gel methods with two reagents ratio. Physico-chemical properties of samples were characterized by thermogravimetric and differential thermal analyses, low-temperature adsorption/desorption method and transmission electron microscopic studies. It was found that all sorbents were obtained in a form of amorphous layer-structure magnesium silicates with micro- and mesoporous structures. The ion exchange properties of these materials for removing Cs+, Sr2+ Cu2+, Co2+ and Cd2+ from the water solution were investigated. Data obtained showed that magnesium silicate obtained by precipitation has the higher capacity towards the heavy metal cations compared to the radionuclides regardless of the method used for synthesis. The sample synthesized with excess of metasilicate exhibited the higher efficiency of heavy metal cations sorption than the sample obtained using equimolar ratio of components. Among Langmuir, Freundlich and Dubinin–Radushkevich models, Langmuir model fitted well for experimental data received on these adsorbents.

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Data obtained by low temperature adsorption/desorption of nitrogen.

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Acknowledgements

Financial support for this study has been provided by National Academy of Sciences of Ukraine within the framework of the target research program “Synthesis and physicochemical studies of composite materials for environmental purposes based on natural and synthetic silicates”, 2022-2024. The authors thank N. I. Danilenko and O. I. V'yunov for their help in carrying out TEM and XRD measurements, and M. M. Tsyba for supporting the porous investigations of the materials.

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MVK – Junior Researcher, synthesized all samples, took part in the investigation of physico-chemical properties of materials and in discussion of rezults, prepared Figures 2-4. TAK – Lead engeneer, prepared all solutions for synthesis and adsorption experiments, analysed solutions by complexonometric titration. MFK – Researcher, measured concentrations of cesium, strontium, copper, cobalt and cadmium in initial and equilibrium solutions of chlorides and nitrates by atomic adsorption analyzer. IVR – idea of investigation, fitted the experimantal data by theoretical models, analysed results of physico-chemical investigation, wrote the main manuscript.

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Correspondence to I. V. Romanova.

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Kravchenko, M.V., Khodakovska, T.A., Kovtun, M.F. et al. Inorganic sorbents based on magnesium silicates obtained by two synthetic routes. Environ Earth Sci 81, 549 (2022). https://doi.org/10.1007/s12665-022-10664-7

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  • DOI: https://doi.org/10.1007/s12665-022-10664-7

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