Abstract
The reactions of humic acids in a pure form and in the composition of coal with sodium percarbonate occurring on solid-phase mechanochemical treatment were compared. Analysis for CHNO, IR spectroscopy, and potentiometric titration were used to study changes in the composition of humic acids mechanochemically treated after isolation from brown coal. The sorption properties in relation to heavy metal ions (Zn2+, Cu2+, and Cd2+) and their changes as a result of the treatment were studied. The results were correlated with data similar to those for humic acids in coal that underwent mechanochemical treatment. It was demonstrated that, at present, an increase in the yield of humic acids and the concentrations of phenolic and carboxyl groups in brown coal as a result of treatment with sodium percarbonate can be explained by the oxidation of fractions other than humic acids in the organic matter of brown coal.
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ACKNOWLEDGMENTS
The authors express their acknowledgements to the Multi-Access Chemical Research Center, Siberian Branch, Russian Academy of Sciences for performing the CHNO analysis and IR-spectroscopy of the samples.
Funding
This study was supported by the Russian Science Foundation (grant no. 22-73-00192, https://rscf.ru/project/22-73-00192/).
Data on the mechanochemical processing of brown coal used for comparison were obtained within the framework of a grant from the President of the Russian Federation for State Support of Young Russian Scientists—Doctors of Science (project no. MD-2330.2022.1.3).
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Translated by V. Makhlyarchuk
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Skripkina, T.S., Yudina, L.I., Tikhova, V.D. et al. Solid-Phase Reactions of Humic Acids with Sodium Percarbonate as a Way to Study Processes Occurring on the Mechanochemical Oxidation of Brown Coal. Solid Fuel Chem. 57, 402–410 (2023). https://doi.org/10.3103/S0361521923060071
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DOI: https://doi.org/10.3103/S0361521923060071