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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- Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Electrochemical Performance of Biomass-Derived AC and CNTs-Based Supercapacitors(IGI Global, 2024-11-22); ; - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Synthesis of Biomass-Derived Graphene Nanomaterials by Chemical Activation with KOH(Multidisciplinary Digital Publishing Institute, 2025-11-21); ; Цитирования (OpenAlex) 8Цитирования (OpenCitations) 1 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Comparative Study of the Structural and Adsorptive Performance of Biomass-Derived Graphene Materials(Multidisciplinary Digital Publishing Institute, 2026-02-08); ; Svetlana AleshkovaThis study presents the development of an environmentally benign and economically viable methodology for the synthesis of graphene-containing carbon materials derived from renewable agricultural residues, specifically walnut shells, rice husks, and apricot stones. The proposed synthesis route involves sequential stages of controlled pre-carbonization, desilicification, chemical activation with potassium hydroxide (KOH), and subsequent mild exfoliation, resulting in the formation of few-layer graphene with a high degree of structural ordering. Pre-carbonization carried out at 523–573 K, followed by activation at 1123 K, yields graphene sheets exhibiting a specific surface area of 1300–1800 m2/g, a carbon content of 60–90%, and an average pore diameter below 100 nm. The synthesized materials were subjected to comprehensive physicochemical characterization using BET surface area analysis, Raman spectroscopy, FTIR spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic absorption flame emission spectrophotometry. Raman spectroscopic analysis revealed an I_G/I_2D intensity ratio of approximately 1.5–2.0, indicating the presence of graphene structures consisting of approximately four to five layers. To enhance adsorption performance, the graphene-containing carbon materials were further functionalized with sulfuric acid, and the successful incorporation of surface functional groups was confirmed by FTIR spectroscopy. The adsorption properties of the functionalized graphene-containing carbon materials were evaluated in aqueous solutions containing sodium, potassium, calcium, and magnesium salts, demonstrating adsorption efficiencies of up to 80%. Compared to conventional biomass-derived graphene synthesis methods, the developed approach produces materials with enhanced porosity, higher graphitic ordering, and improved chemical purity. These characteristics highlight the strong potential of the synthesized graphene-containing carbon materials for applications in energy storage systems, adsorption-based water purification technologies, and environmentally sustainable nanotechnological applications.Цитирования (OpenAlex) 4 - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Биошикізат негізіндегі кеуекті көміртекті сорбциялық материалдар алу және физика-химиялық қасиеттерін зерттеу(2026-04-06); А.Н. ЖумагалиеваFor the first time, an approach to the production of highly efficient porous carbon sorption materials based on lignocellulose agricultural waste has been developed and a comprehensive assessment of their physico-chemical properties has been carried out. Rice husks (RH), walnut shells (WSh), wheat straw (WSt) and pine sawdust (PS) were used as raw materials. The resulting carbonysates were chemically activated with potassium hydroxide at different mass ratios of the activating agent and the carbon matrix. To increase the surface chemical activity of sorbents, potassium hydroxide was used. The morphology of the surface and the elemental composition of the synthesized materials were studied using scanning electron microscopy and energy dispersion analysis, and the functional groups were studied using Fourier transform infrared spectroscopy (FTIR). It has been established that an increase in the degree of activation leads to the development of a hierarchical porous structure with the formation of micro-, meso- and macropores, as well as to an increase in the content of oxygen- and nitrogen-containing functional groups on the surface of carbon materials. The greatest microporosity was achieved with a KOH:carbon mass ratio of 1:4. The formed functional structure helps to increase the sorption capacity of materials in relation to toxic pollutants of various nature. The results obtained confirm the prospects of using synthesized carbon sorbents as environmentally safe and economically feasible materials for cleaning air and water environments. - Некоторые метрики заблокированы вашиминастройками согласия
Тип записи:Публикация, Use of Urea-Modified Activated Carbon Sorbents Derived from Plant Residues for Gas Sorption(Multidisciplinary Digital Publishing Institute, 2026-07-07);