Thermal Stability and Resistance to Biodegradation of Humic Acid Adsorbed on Clay Minerals

Danilin, I.; Tolpeshta, I.; Izosimova, Y.; Pozdnyakov, L.; Stepanov, A.; Salimgareeva, O.

Авторы: Danilin Igor, Tolpeshta Inna, Izosimova Yulia, Pozdnyakov Lev, Stepanov Andrey, Salimgareeva Olga
Журнал: Minerals
Том: 13
Номер: 10
Год издания: 2023
Первая страница: 1
Последняя страница: 16
Номер статьи: 1310
DOI: 10.3390/min13101310
Аннотация: This article studies sorption regularities and evaluates thermal stability and resistance tomicrobial degradation of humic acid during three sorption cycles on bentonite clay, kaolinite, andmuscovite using TGA/DSC, XRD, hydrophobic chromatography, light and electron microscopy, etc.The experiment revealed that kaolinite sorbed more humic acids (HAs) in terms of unit surface area(1.03 10􀀀3 C, g/m2) compared to bentonite (0.35 10􀀀3 C, g/m 10􀀀3 g/m2). Sorption at pH 4.5showed HA fractionation in amphiphilicity and chemical composition. HA was sorbed on the surfaceof all sorbents, mainly via hydrophobic components. No intercalation of HA into the interlayer spacesof montmorillonite was observed during sorption. Sorption via hydrophilic interactions was mostlyperformed on muscovite and bentonite rather than on kaolinite. Sorption of HA resulted in changesin its chemical composition and decreased C/N compared to free HA, which demonstrated selectivesorption of nitrogen-containing compounds more typical of muscovite. All minerals adsorbed onlya relatively thermolabile HA fraction, while its thermal stability increased compared to that beforethe experiment. The thermal stability and ratio of the Exo2/Exo1 peak areas on the DSC curves ofsorbed HA increased with each subsequent sorption cycle. We revealed the following relationshipbetween thermal stability and resistance to microbial oxidation of the sorbed HA: The higher thethermal stability, the less available the sorbed HA becomes for utilization by microorganisms.
Добавил в систему: Изосимова Юлия Геннадьевна

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Thermal Stability and Resistance to Biodegradation of Humic Acid Adsorbed on Clay Mineralsстатья Исследовательская статья

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