Influence of Chemical Modification on the Structure, Composition, and Properties of Lignite Humic Acids
The influence of chemical modification on the functional–group composition of humic acids derived from Tisul’sk lignite (Kansko-Achinsk Basin) is studied. The structural changes of the humic acids as a result of destructive alkylation of n-butanol and oxidation of hydrogen peroxide are compared, by means of IR, Raman, ESR, and NMR spectroscopy. Alkylation of the humic acids changes the composition and content of the aliphatic fragments in their structure. Oxidation by hydrogen peroxide increases the content of acid-bearing groups.
Keywords:lignite humic acids alkylation oxidation functional-group composition
Financial support for this research was provided under a grant of the Russian government to the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences (project AAAA-A17-117041910148-9, under the direction of S. I. Zherebtsiov).
The research was conducted on equipment provided by the Cooperative-Use Center at the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences.
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