• Tatyana V. Hrydnieva Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine
  • Yuri E. Sknar Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine
  • Irina V. Sknar Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine
  • Oksana V. Demchyshyna Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine



silicon dioxide, rice husk, double extraction, characterization, morphology, structure


An actual task of modern chemical technology is the synthesis of high-purity amorphous silicon dioxide with a high specific surface area. Optimization of technological processes in the direction of reducing energy costs and environmental pollution factors leads to an active search for ways to process raw materials of plant origin to obtain silicon dioxide with desired physical and chemical characteristics.
Optimal, from the point of view of energy saving, is the method of processing rice husks, which provides for the chemical purification of vegetable raw materials with their subsequent heat treatment. In this work, it is shown that the use of the double extraction method makes it possible to achieve high characteristics of silicon dioxide synthesized from rice husks. It has been established that the processing of rice husks in an alcoholic solution of hydrochloric acid, followed by processing in an aqueous solution of sulfuric acid, leads to the purification of raw materials from metal ions and a significant amount of lignin and cellulose. Silicon dioxide, obtained as a result of 5-minute firing at 600 °C of the prepared raw material, is a white powder with a predominant size of about 2 μm and a specific surface area of ​​235-250 m2/g. The product is X-ray amorphous and highly pure. The high characteristics of silicon dioxide synthesized by the proposed method open up great prospects for its use as carriers for active masses of catalysts, drugs and cosmetics.


Shen, Y. (2017). Rice husk silica derived nanomaterials for sustainable applications. Renewable and Sustainable Energy Reviews, 80, 453–466.

Pode, R. (2016). Potential applications of rice husk ash waste from rice husk biomass power plant. Renew Sustain Energy Rev, 53(14), 68–85. 10.1016/j.rser.2015.09.051.

Lee, T., Othman, R., Yeoh, FY. (2013). Development of photoluminescent glass derived from rice husk. Biomass Bioenergy, 59, 380-392. biombioe.2013.08.028

Babaso, PN., Sharanagouda, H. (2017). Rice husk and its applications: Review. Int J Curr Microbiol Appl Sci, 6(11), 44–56. ijcmas.2017.610.138.

Adam, F., Appaturi, JN., Iqbal, A. (2012). The utilization of rice husk silica as a catalyst: review and recent progress. Catal Today, 190, 2–14. 10.1016/j.cattod.2012.04.056

Todkar, BS., Deorukhkar, OA., Deshmukh, SM. (2016). Extraction of silica from rice husk. Int J Eng Res Dev, 12, 69–74.

Lovell, EC., Scott, J., Amal, R. (2015). Ni-SiO2 catalysts for the carbon dioxide reforming of methane: varying support properties by flame spray pyrolysis. Molecules, 20(4), 594–609.

Fernandes, I. J., Calheiroa, D., Sanchezb, F. A. L., Camachob, A. L. D., Avila de Campos Rochac, T. L., Moraesd, C. A. M., Caldas de Sousa, V. (2017). Characterization of Silica Produced from Rice Husk Ash: Comparison of Purification and Processing Methods. Materials Research, 20(2), 512–518.

Setyawan, N., Hoerudin Wulanawati, A. (2019). Simple extraction of silica nanoparticles from rice husk using technical grade solvent: effect of volume and concentration. IOP Conf Ser Earth Environ Sci, 309. 309/1/012032.

Terzieva, V., Fransaer, J., Celis, J.-P. (2000). Codeposition of Hydrophilic and Hydrophobic Silica with Copper from Acid Copper Sulfate Baths. Journal of The Electrochemical Society, 147 (1) 198–202.

Sknar, Y., Sknar, I., Danylov, F. (2016). Electrodeposition of Ni–ZrO2 Nanocomposites from Methanesulfonate Electrolytes. Materials Science, 51( 6), 877–884.

Mehdinia, S. M. (2014). Rice husk silica adsorbent for removal of hexavalent chromium pollution from aquatic solutions. Iran J Energy Environ, 5, 2–8. https://doi. org/10.5829/idosi.ijee.2014.05.02.14.

Zhang, Y., Zhang, H. (2008). Study on preparation of a novel silica adsorbent and its selective separation applied to genistein. Braz J Chem Eng, 25(20), 1–6.

Bernardos, A., Kourimsk´a, L. (2013). Applications of mesoporous silica materials in food - a review. Czech J Food Sci, 31, 99–107.

Steven, S., Restiawaty, E., Bindar, Y. (2021). Routes for energy and bio-silica production from rice husk: A comprehensive review and emerging prospect. Renewable and Sustainable Energy Reviews, 149, 111329

Azat, S., Korobeinyk, A.V., Moustakas, K., Inglezakis, V.J. (2019). Sustainable production of pure silica from rice husk waste in Kazakhstan. Journal of Cleaner Production, 217, 352–359.

Steven, S., Restiawaty, E., Pasymi, P., Bindar, Y. (2021). An appropriate acid leaching sequence in rice husk ash extraction to enhance the produced green silica quality for sustainable industrial silica gel purpose. J Taiwan Inst Chem Eng, 122C(5), 1–7.

Kumar, A., Priyadarshinee, R., Roy, A., Dasgupta, D., Mandal, T. (2016). Current techniques in rice mill effluent treatment: emerging opportunities for waste reuse and waste-to-energyto-energy conversion. Chemosphere, 164(40), 4–12. chemosphere.2016.08.118.

Costa, JAS., Paranhos, CM. (2018). Systematic evaluation of amorphous silica production from rice husk ashes. J Clean Prod, 192(6), 88–97. jclepro.2018.05.028

Azat, S., Sartova, Z., Bekseitova, K., Askaruly, K. (2019). Extraction of high-purity silica from rice husk via hydrochloric acid leaching treatment. Turkish J Chem, 43(12), 58–69. doi: 10.3906/kim-1903-53.

Madrid, R., Margarido, F., Nogueira, CA. (2011). Valorisation of rice husk by chemical and thermal treatments. In: Advanced Materials Forum VI; Guimarães, Portugal, 659–664. doi: 10.4028/

Hrydnieva, T., Sknar, Y., Riabik, P., Liashenko, A., Demchyshyna, O. (2019). A study of lignin-free rice husk decomposition kinetics. Journal of Chemistry and Technologies, 27(2), 255–263.

Sknar, Yuri E., Hrydnieva, Tatyana V., Liashenko, Anna O., Riabik, Pavel V., Sknar, Irina V., Hrydniev, Yehor A. (2021). Study of kinetics of thermal decomposition of the rice husk, purified from cellulose. Journal of chemistry and technologies, 29 (1–2), 128–136.

Gridneva, T.V., Kravchenko, A.V., Barsky, V.D., Gurevina, N.A. (2016). Obtaining of high purity amorphous silicon dioxide from rice husk. Chem. and Chem. Techn. 10(4), 499–505.