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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2024 - 20262

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Автор: search.filters.author.Zulkhair Aimukhametovich MansurovТема: search.filters.subject.chemical activation

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    Electrochemical Performance of Biomass-Derived AC and CNTs-Based Supercapacitors
    (IGI Global, 2024-11-22)
    Meiram K. Atamanov
    ;
    Tolganay Atamanova
    ;
    Azamat Taurbekov
    ;
    Zulkhair Aimukhametovich Mansurov
    This study investigates the electrochemical performance of activated carbon (AC) derived from two biomass sources, rice husk (RH) and walnut shell (WS), utilizing two activation methods: chemical activation with potassium hydroxide (KOH) and physical activation with carbon dioxide (CO2). The aim is to evaluate the potential of these bio-derived carbon materials in energy storage applications, particularly for supercapacitors. The electrochemical behavior of the activated carbon electrodes was assessed using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques, along with electrochemical impedance spectroscopy (EIS), to evaluate the specific capacitance, energy density, charge transfer resistance, and ion diffusion properties.
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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.