Investigation of the structure and sorption peculiarities of cobalt and uranium ions by nanocomposites based on montmorillonite and tetraethoxysilane

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.144553

Keywords:

porous structure, template-free synthesis, aluminosilicate adsorbents, structural modification, cobalt adsorption, uranium adsorption

Abstract

The structure and adsorption characteristics of silica -and montmorillonite-based nanocomposites are investigated. Tetraethoxysilane was used as a source of silica. The porous structure was investigated by the method of low-temperature nitrogen adsorption.

According to the research results, it was found that a small amount of silica in nanocomposite samples (14 % SiO2) contributes to the formation of material with a larger specific surface area and greater number of meso- and macropores compared to original montmorillonite. This, in turn, leads to a better diffusion of ions of different nature into the nanocomposite structure. An increase in the silica content (up to 57 % SiO2) allows obtaining microporous samples with a large specific surface area.

It was determined that the increase of the montmorillonite content in the investigated samples contributes to the improvement of the adsorption properties of nanocomposites in relation to the removal of cobalt(II) ions from the aqueous medium. At an optimum silica content (3–14 % SiO2), the experimental samples retain high values of maximum cobalt adsorption (14 mg/g), as well as original montmorillonite. It was also found that an increase in the silica concentration in the samples increases the efficiency of removal of uranium(VI) ions from the aqueous medium (from 12 mg/g in original montmorillonite to 25 mg/g for nanocomposites with a silica content of 57 %). This is due to, first, an increase in the specific surface area of the samples, and secondly – an increase in the number of surface hydroxyl groups, which more selectively remove uranium from solutions. Thus, selection of the chemical composition of nanocomposites based on silica gel and montmorillonite allows regulating porous structures and surface chemistry, and thus increasing the sorbent efficiency depending on the task

Author Biographies

Dmytro Doroshenko, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» Peremohy ave., 37, Kyiv, Ukraine, 03056

Postgraduate student

Department of Chemical Technology of Ceramics and Glass

Igor Pylypenko, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» Peremohy ave., 37, Kyiv, Ukraine, 03056

PhD, Assistant

Department of Chemical Technology of Ceramics and Glass

Iryna Kovalchuk, Institute for Sorption and Problems of Endoecology NAS of Ukraine Henerala Naumova str., 13, Kyiv, Ukraine, 03164

PhD, Senior Researcher

Department of ecological chemistry

Borys Kornilovych, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» Peremohy ave., 37, Kyiv, Ukraine, 03056

Doctor of Chemical Sciences, Professor, Head of Department, Corresponding Member of NAS Ukraine

Department of Chemical Technology of Ceramics and Glass

Larysa Spasonova, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute» Peremohy ave., 37, Kyiv, Ukraine, 03056

PhD, Associate Professor

Department of chemical technology of ceramics and glass

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Published

2018-10-16

How to Cite

Doroshenko, D., Pylypenko, I., Kovalchuk, I., Kornilovych, B., & Spasonova, L. (2018). Investigation of the structure and sorption peculiarities of cobalt and uranium ions by nanocomposites based on montmorillonite and tetraethoxysilane. Eastern-European Journal of Enterprise Technologies, 5(6 (95), 6–11. https://doi.org/10.15587/1729-4061.2018.144553

Issue

Vol. 5 No. 6 (95) (2018): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2018 Dmytro Doroshenko, Igor Pylypenko, Iryna Kovalchuk, Borys Kornilovych, Larysa Spasonova

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