Sorption of Cobalt Cations by Humic Acids
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The reaction of cobalt cations with humic acids produced from Tisul lignite (Kansko-Achinsk Basin) is investigated. The influence of modification by hydrogen peroxide on the functional-group composition of the humic acids and their sorptional properties is considered. The sorptional capacity of the modified and unmodified humic acids is determined. IR Fourier, ESR, and 13C NMR (CP MAS) data show that the sorption of cobalt cations by modified and unmodified humic acids occurs by two mechanisms: ion exchange and complex formation.
Keywords:humic acids modified humic acids sorption cobalt cations ion exchange complex formation
Financial support for this research was provided to the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences (project AAAA-A17-117041910148-9 directed by S. I. Zherebtsov).
In recording the IR, ESR, and NMR spectra, we utilized equipment from the Collective Use Center at the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences.
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