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Publisher: Altai State University
Journal: Khimiia rastitel'nogo syr'ia (Chemistry of plant raw material)
Languages: Russian
Types: Article
Subjects: humic acids, mechanical activation, sorption of polyvalent metals, гуминовые кислоты; механоактивация; сорбция поливалентных металлов.

Classified by OpenAIRE into

mesheuropmc: complex mixtures
The paper considers the interaction of modified peat humic acids with salts of heavy metals under various pH. It was shown the change of structural characteristics of humic acids in the process of mechanical activation under reducing conditions. Regardless of the conditions mechanical activation slightly increases the degree of aromaticity due to possible condensation reactions. At mechanical activation of peat in the air without any reagents one observes oxidation of the peripheral carbohydrate fragments in the structure of humic acids. Modification in argon reduces the number of carboxyl and carbonyl groups, phenolic hydroxyls; oxidized aromatic fragments and "lignin" components in the composition of humic acids and naturally increases a proportion of alkyl substituentsIt is revealed that modified humic acids enriched oxygen-containing groups have the highest sorption capacity in relation to ions of copper and nickel. Probability and stability of the forming chelate complexes are determined by the composition and the number of oxygen-containing ionogenic groups and acid-base balance. Sorption capacity of the humic acids with respect to a nickel ion is lower than that to a copper ion. 
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