Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

Постоянный URI для этого сообществаhttps://cris.qyzpu.kz/handle/123456789/1

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Автор: search.filters.author.Almagul KerimkulovaТема: search.filters.subject.microporosity

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    Адсорбция препарата «Вольтарен» на пористых углеродных материалах в статических и динамических условиях
    (2026-04-06)
    Jakpar Jandosov
    ;
    Alzhan Baimenov
    ;
    А.Н. Сабитов
    ;
    Е.О. Досжанов
    ;
    D. Chenchik
    The article investigates the adsorption of diclofenac (pure API and as part of the Voltaren preparation) on porous carbon materials obtained from rice husks by chemical activation methods (H3PO4, K2CO3, KOH), as well as on synthetic carbon from xerogel. A comparative assessment of the sorption capacity and the kinetics of the process was carried out under static and dynamic conditions. It was found that the KOH-activated sample (SBET = 2610 m2/g) has the highest microporosity and demonstrates the maximum adsorption capacity (up to 956 mg/g in static and up to 1016 mg/g in a column with a fixed layer). Kinetic data is well described by a pseudo second-order model (R2 > 0.99), and dynamic adsorption is described by the Thomas model (R2 = 0.998). This allows us to predict the efficiency of sorbents in flow systems. There was no significant effect of the auxiliary components of the dosage form on the sorption process. The established patterns indicate the predominant interaction of the diclofenac molecule with the microporous carbon matrix through π–π interactions and electrostatic effects. The results obtained confirm the prospects of alkaline-activated carbon materials based on biomass for the development of effective enterosorbents for intoxication with nonsteroidal anti-inflammatory drugs.
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    Use of Urea-Modified Activated Carbon Sorbents Derived from Plant Residues for Gas Sorption
    (Multidisciplinary Digital Publishing Institute, 2026-07-07)
    Almagul Kerimkulova
    ;
    Yersultan Yermoldanov
    ;
    Aitugan Sabitov
    ;
    Leticia Fernández Velasco
    ;
    Nazym Asanbek
    The growing demand for efficient and sustainable materials for air purification has stimulated interest in activated carbons derived from renewable biomass resources. In this study, activated carbons were prepared from rice husk, wheat straw, sawdust, and walnut shells and systematically investigated as sorbents for toxic gases and volatile organic compounds. The materials were characterized using nitrogen and water vapour sorption isotherms, scanning electron microscopy, thermogravimetric analysis, Fourier-transform infrared spectroscopy, and energy-dispersive X-ray analysis to evaluate their textural properties, morphology, thermal stability, and surface chemistry. The results showed that the precursor type strongly influences the pore structure and functional group composition of the activated carbons. Wheat straw and Rice husk–derived activated carbons exhibited the highest total pore volume and a well-developed porous structure, together with a high content of oxygen- and silicon-containing elements. Gas breakthrough experiments with different probes showed that wheat straw–derived activated carbon excels in VOC removal due to its highly microporous structure. In contrast, rice husk–derived activated carbon displays strong affinity toward inorganic gases such as NH₃ and, after urea modification, achieves enhanced performance for SO₂. These results underscore the versatility and practical applicability of carbon materials obtained from plant residues.