Abstract
The IR-Fourier, ESR and solid-state 13 C NMR analysis are used for investigation of unmodified and modified humic acids obtained from Tisul lignite (the Kansko-Achinsk Basin). Treatment with Hydrogen peroxide used for modification of humic acids and it changes the functionalgroup composition of the humic acids and increases the sorptional capacity
Highlights
The structure of humic acids reflects the material from which they are derived [1,2,3,4]
Modification by hydrogen peroxide increases the content of carboxyl groups, whose protons participate in ion exchange, and expands the sorptional capacity of the humic acids [10]
We investigate the functional group composition of humic acids derived from lignite after modification by hydrogen peroxide
Summary
The structure of humic acids reflects the material from which they are derived [1,2,3,4]. The reactivity of humic acids depends on the presence of different functional groups and it reflects the content of aromatic conjugates and degree of condensation. Chemical modification may change the functional composition of the humic acids. The applications of humic acids depend on their chemical composition and properties. Purposeful chemical modification may increase the content of the desired functional groups and thereby improve the sorptional characteristics of the humic acids. The sorption of zinc cations by humic acids derived from lignite and naturally oxidized coal from the Tisul field is due to ion exchange, as shown in [10]. Modification by hydrogen peroxide increases the content of carboxyl groups, whose protons participate in ion exchange, and expands the sorptional capacity of the humic acids [10]. We investigate the functional group composition of humic acids derived from lignite after modification by hydrogen peroxide
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