Abstract
The physicochemical properties of silicas prepared from copper–nickel production tailings and modified with hydrazide functional groups were studied. The IR data confirm the presence of modifier functional groups on the surface of the initial silicas. The modifiers are assumed to be immobilized on the silica support by hydrogen bonding between the hydrazide carbonyl oxygen atom and silanol hydrogen atoms. Thermal analysis shows that the sorbents obtained are stable up to 220–250°С, whereas the initial hydrazides and dimethylhydrazides start to decompose at a lower temperature. The degrees of swelling of the initial and modified sorbents, the conditional ionization constants of the functional groups, and the isoelectric point were determined. Samples were chosen for further studies of the sorption of nonferrous and rare metals.
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ACKNOWLEDGMENTS
The authors are grateful to Cand. Sci. (Chem.) A.G. Kasikov, head of laboratory of the Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Resources, Kola Scientific Center, Russian Academy of Sciences for making available the silica samples.
The study was performed using the equipment of the Center for Shared Use “Investigations of Materials and Substances,” Perm Federal Research Center, Ural Branch, Russian Academy of Sciences.
Funding
The study was financially supported by the Russian Science Foundation (project no. 20-69-46066).
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Translated from Zhurnal Prikladnoi Khimii, No. 7, pp. 910–918, July, 2022 https://doi.org/10.31857/S0044461822070106
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Batueva, T.D., Zabolotnykh, S.A. & Chekanova, L.G. Physicochemical Properties of Silicas Modified with Hydrazide Functional Groups. Russ J Appl Chem 95, 1004–1011 (2022). https://doi.org/10.1134/S1070427222070114
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DOI: https://doi.org/10.1134/S1070427222070114