Abstract
This study presents the results of thermochemical synthesis and functional modification of carbon–silicon sorbents derived from rice husks, intended for use as filtering materials with antiseptic properties. Carbonization was carried out in an inert gas atmosphere at temperatures ranging from 600 to 900 °C, followed by activation in a flow of carbon dioxide or water vapor. The resulting porous structures were characterized by a high specific surface area (up to 550 m²/g) and a considerable micropore volume. Molecular iodine, chlorhexidine gluconate, and tannin were employed as impregnating agents. Experimental data confirmed the ability of the sorbent to absorb iodine vapors from both gaseous and liquid phases, with a saturation capacity of up to 259 mg/g. The influence of impregnation on the textural properties of the material was investigated: an increase in specific surface area and pore volume was observed upon the introduction of active components. BET analysis demonstrated a total micropore surface area of up to 551 m²/g, confirming the efficiency of the modification for air purification purposes. The developed filtering monoblocks are promising for application in air disinfection systems within enclosed and sanitation-sensitive environments.