Synthesis and Study of the Sorption Properties of Calcium Silicate Obtained from Rice Husks
Appazov N.O. Narmanova R.A. Tolegenkyzy M.O. Kumar N. Sergiy L. Anel S. Guldana D. Gushchin Artem L. Saken K. Indira Y. Dinara N. Altynkul T. Syzdykbayev Marat I. Saktaganova Nargul A. Rakhymzhan T. Nurzhan S. Assel S. Klara D. Esenzhol N. Bakhytbek A.
January 2026Sami Publishing Company
Advanced Journal of Chemistry, Section A
2026#9Issue 1124 - 133 pp.
This article presents the synthesis of calcium silicate from rice husks and an analysis of its physicochemical and adsorption characteristics. Sodium hydroxide was used to extract silica, and calcium chloride was then precipitated to create the sorbent. The extraction of silicon from rice husks in the form of a sodium silicate solution was improved and the duration of the process was shortened by using microwave irradiation. The resulting calcium silicate sorbent was thermally treated at 300–900 °C to enhance its sorption properties. The highest iodine adsorption activity (56%) and ideal structural properties were discovered to be provided by heat treatment at 700 °C. Morphological, elemental, and X-ray diffraction analyses confirmed the sorbents high stability and efficiency. The findings demonstrate the potential of calcium silicate as an efficient and environmentally friendly material for water purification. The proposed technology enables the valorization of abundant agricultural waste and offers an economical, sustainable pathway for producing effective sorbents. The results could be the starting point for additional studies and the development of economical, effective, and ecologically friendly sorbents.
Rice husk Calcium silicate Sorbent Adsorption Sodium silicate Adsorption activity Elemental composition
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Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
Universidade Lusofona, Lisboa, Portugal
Karaganda Industrial University, Karaganda, Kazakhstan
Nikolaev Institute of Inorganic Chemistry SB RAS, Novosibirsk, Russian Federation
Abai Kazakh National Pedagogical University, Almaty, Kazakhstan
Korkyt Ata Kyzylorda University
Universidade Lusofona
Karaganda Industrial University
Nikolaev Institute of Inorganic Chemistry SB RAS
Abai Kazakh National Pedagogical University
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