Physicochemical and Antioxidant Properties of Humic Acids from Low-Sulfur Kazakhstan Shales
Suimbayeva S.M. Kairbekov Z.K. Maloletnev A.S. Kishibayev K.O. Dzheldybaeva I.M.
September 2022Pleiades Publishing
Coke and Chemistry
2022#65Issue 9386 - 391 pp.
The structural, chemical, and physicochemical characteristics and antioxidant properties of humic acids isolated from shale in the Kenderlyk and Kiin fields are determined. Negative values of the acids’ oxidation are found: –3.62 and –4.06 for Kenderlyk and Kiin shale, respectively. Thus, the shale-based humic acids are reducing agents. IR spectroscopic data show clear absorption bands of hydroxyl, functional, and carbonyl groups. ESR spectroscopy indicates a high content of paramagnetic centers in the humic acids: 9.3 × 1017 and 9.5 × 1017 spin/g for Kenderlyk and Kiin shale, respectively. The paramagnetic centers in the molecular structure of the humic acids indicate that they are promising as antioxidants.
antioxidant properties , ESR spectroscopy , functional groups , humic acids , IR spectroscopic data , Keywords: fuel shales , physicochemical characteristics
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Scientific Research Institute for New Chemical Technologies and Materials, al-Farabi Kazakh National University, Almaty, Kazakhstan
Mining Institute, Moscow Institute of Steel and Alloys, Moscow, Russian Federation
Kazakh National Women’s Pedagogical University, Almaty, Kazakhstan
Scientific Research Institute for New Chemical Technologies and Materials
Mining Institute
Kazakh National Women’s Pedagogical University
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