Technology for Obtaining Silicon Dioxide from Rice Husk Using Microwave Irradiation
نویسندگان
1 Laboratory of Engineering Profile, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan “DPS Kyzylorda” LLP, Kyzylorda, Kazakhstan
2 Laboratory of Engineering Profile, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
3 Department of Engineering Technology, Institute of Engineering and Technology, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
4 Department of Metal Forming, Faculty of Metallurgy and Mechanical Engineering, Karaganda Industrial University, Karaganda, Kazakhstan
5 Department of Chemistry, Faculty of Natural Sciences and Geography, Abai Kazakh National Pedagogical University
6 Department of Electric Power Engineering, Technosphere Safety and Ecology, Institute of Engineering and Technology, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
7 Department of Engineering Technology, Institute of Engineering and Technology, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan “CNEC” LLP, Kyzylorda, Kazakhstan
8 Department of Biology, Geography and Chemistry, Institute of Natural Science, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan “DPS Kyzylorda” LLP, Kyzylorda, Kazakhstan
9 Laboratory of Engineering Profile, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
10 Laboratory of Engineering Profile, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
11 Department of Electric Power Engineering, Technosphere Safety and Ecology, Institute of Engineering and Technology, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
12 Department of Biology, Geography and Chemistry, Institute of Natural Science, Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
doi
10.48309/ajca.2026.524934.1857چکیده
Amorphous silicon dioxide was obtained by acid washing of rice husks followed by microwave irradiation. The optimal condition is a microwave irradiation power of 700 watts and a duration of 5 minutes, which demonstrates the effectiveness of this method in increasing acid penetration and accelerating the decomposition of organic matter in rice husks. Firing was carried out in a muffle furnace at 300 °C, 500 °C, and 800 ℃ with exposure at each temperature for 30 to 60 minutes. The purity of the obtained silicon dioxide was assessed by the spectrophotometric method, measuring the optical density at a wavelength of 815 nm. The yield of amorphous silicon dioxide was 15.3%, while its purity reached 100%. When studying silicon dioxide samples, IR Prestige-21 FTIR spectrometer, JSM-6490LV SEM (effective magnification 300,000) with the systems of energy-dispersive microanalysis INCA Energy and structural analysis HKL-Basic, and Drawell DW-XRD-27 mini X-ray diffractometer (Cu-radiation = 1.5406) were used. The FTIR spectrum of silicon dioxide (SiO₂) obtained from rice husks demonstrates its structural identity, confirmed by characteristic oscillation bands. A wide and pronounced absorption band in the region of about 1030 cm-1 indicates asymmetric stretching vibrations of Si–O–Si bonds, a characteristic feature of amorphous silica. X-ray analysis shows the high degree of purity of the material, as well as the efficiency and accuracy of the applied heat treatment. This indicates that the resulting product mainly consists of amorphous silicon dioxide, which makes it promising for use in pharmaceuticals, adsorbents and nanomaterials, where uniformity of structure and large specific surface area are critically important. In general, the results show that acid treatment using microwave radiation not only accelerates the process of obtaining silicon dioxide from rice husks, but also contributes to improve its quality and energy efficiency of production.
