Changes in the Structural Characteristics and Composition of Oxidized Coal Because of Mechanochemical Action

An increase in the concentration of acidic surface groups, the sorption exchange capacity of oxidized coal, and the yield of humic acids by 20–40% due to mechanical action with alkaline and oxidizing alkaline reagents was found. According to the IR-spectroscopic data of coals and the potentiometric...

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Bibliographic Details
Published in:Solid fuel chemistry 2022-04, Vol.56 (2), p.145-151
Main Authors: Linkevich, E. V., Yudina, N. V., Savel’eva, A. V., Berezina, E. M.
Format: Article
Language:English
Subjects:
Acidic oxides
Chemistry
Chemistry and Materials Science
Fragments
Humic acids
Oxidation
Physical Chemistry
Reagents
Sorption
Titration
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Summary:An increase in the concentration of acidic surface groups, the sorption exchange capacity of oxidized coal, and the yield of humic acids by 20–40% due to mechanical action with alkaline and oxidizing alkaline reagents was found. According to the IR-spectroscopic data of coals and the potentiometric titration of acidic groups, a decrease in the concentration of carboxyl groups in aliphatic fragments due to their maximum sorption capacity for metal ions was noted. Humic acids were characterized by a significant increase in the number of oxygen-containing groups and stable polyconjugated heteroaromatic fragments as a result of mechanochemical action.
ISSN:0361-5219
1934-8029
DOI:10.3103/S0361521922020045