Жарияланымдар / Публикации

Постоянный URI для этого сообществаhttps://cris.qyzpu.kz/handle/123456789/2

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2025 - 20263

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Автор: search.filters.author.Kenes KudaibergenovТема: search.filters.subject.rice husk

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    Preparation of Polymer-based Composite Films using Cellulose Derived from Agricultural Waste
    (2025-01-01)
    Yerkebulan A. Altynov
    ;
    B. U. Rakhimova
    ;
    Ulan Zhantikeyev
    ;
    Kalampyr Bexeitova
    ;
    Сейтхан Азат
    This study explores the production of microcrystalline cellulose (MCC) through delignification of agricultural biomass and investigates its physicochemical properties.Rice husks and wheat straw served as primary biomass sources.The influence of the biomass-to-peroxyacetic acid ratio on MCC yield was systematically evaluated, with optimal yields of 70% from wheat straw and 85% from rice
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    PRODUCTION OF MICROCRYSTALLINE CELLULOSE FROM AGRICULTURAL WASTE AND PREPARATION OF GEL FILMS BASED ON IT
    (2025-10-22)
    M. K. Shamshidenov
    ;
    Yerkebulan A. Altynov
    ;
    B. U. Rakhimova
    ;
    Kalampyr Bexeitova
    ;
    A. Seithan
    This paper discusses the process of obtaining microcrystalline cellulose by removing lignin from biomass and studying its properties. Rice husks, which are agricultural waste, were used as biomass. The effect of the ratio of biomass to peroxyacetic acid on the yield of microcrystalline cellulose was determined. The yield of microcrystalline cellulose from rice husks at a ratio of 1/14 was 70%. Additionally, gel films based on rice MCC and sodium alginate were prepared, and their hydrolytic degradation properties were studied. In an acidic medium (pH 4.08), the gel film showed a 66% mass loss within 7 days, indicating pH sensitivity and biodegradability. The morphological surface, average particle size, and structure of the samples were studied. The surface morphology of the samples was examined using a scanning electron microscope, and it was found that the average particle size was 7–10 µm. X-ray diffraction (XRD) analysis confirmed the amorphous–crystalline nature of the material. Fourier-transform infrared spectroscopy (FTIR) confirmed the presence of hydroxyl, carbonyl, and ether functional groups. Thermogravimetric analysis (TGA) demonstrated the thermal stability of the gel films. The developed method for producing microcrystalline cellulose from biomass requires fewer processing stages compared to traditional methods and is environmentally safe. It was shown that high-quality microcrystalline cellulose can be obtained in one stage without the use of reagents containing sulfur and chlorine, high pressure, or large amounts of water. The interest in microcrystalline cellulose is due to its unique properties, such as lightness, non-toxicity, biocompatibility, and biodegradability. Currently, it is in high demand in the production of aerogels, gels, biocomposites, biodegradable materials, and films.
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    ADSORBENTS BASED ON MODIFIED NANOCELLULOSE: WATER PURIFICATION FROM ORGANIC AND INORGANIC POLLUTANTS
    (Shakarim University, 2026-07-29)
    Zhexenbek Toktarbay
    ;
    Makhabbat Kunarbekova
    ;
    B. U. Rakhimova
    ;
    Kenes Kudaibergenov
    ;
    Dana Ashiraliyeva
    Against the backdrop of rapid industrial growth, water pollution has become a pressing global environmental issue. This review provides a systematic analysis of the efficiency of functionalized nanocellulose- based adsorbents for the removal of organic (synthetic dyes, phenols, antibiotics, pesticides) and inorganic (Pb 2+ , Cd 2+ , Hg 2+ , Cr(VI), Cu 2+ , As) pollutants from water. Key findings: the highest sorption capacities are achieved by TEMPO-oxidized nanocellulose and amine-functionalized composites – up to 2500 mg/g for methylene blue and up to 2270 mg/g for lead ions. Nanocellulose-based molecularly imprinted polymers (MIPs) selectively adsorb phenols with efficiencies of up to 97% even in the presence of structurally similar competitors. Most adsorbents reviewed retain 80+90% of their capacity after 20 regeneration cycles. The paper examines three main types of nanocellulose (CNC, NFC, BNC), their preparation methods (acid hydrolysis, TEMPO-oxidation, mechanical and enzymatic treatment), and surface functionalization strategies (isocyanate-based, amine- and thiol-functionalization). The alignment of nanocellulose production from agricultural waste (rice husks, soybean hulls) with sustainable development principles is emphasized. Key unresolved challenges – scale-up, stability in real wastewater matrices, and cost-effectiveness – and future research directions are also identified.