Physicochemical Properties of Silicas Modified with Hydrazide Functional Groups

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 t...

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Bibliographic Details
Published in:Russian journal of applied chemistry 2022-07, Vol.95 (7), p.1004-1011
Main Authors: Batueva, T. D., Zabolotnykh, S. A., Chekanova, L. G.
Format: Article
Language:English
Subjects:
Carbonyls
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Composite Materials
Functional groups
Hydrazides
Hydrogen atoms
Hydrogen bonding
Industrial Chemistry/Chemical Engineering
Nonferrous metals
Sorbents
Thermal analysis
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Summary: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.
ISSN:1070-4272
1608-3296
DOI:10.1134/S1070427222070114