Carbonized Rice Husk Canal Filters for Air Purification

Tulepov M. Kudyarova Z. Myshyrova Z. Sassykova L.R. Mussatay Y. Umbetkaliev K. Mutushev A. Baiseitov D. Hua R. Mukhanov D.
July 2025 Multidisciplinary Digital Publishing Institute (MDPI)

Processes
2025 #13 Issue 7

Air purification is a key process aimed at removing harmful impurities and providing a safe and comfortable environment for human life and work. This study presents the results of an investigation into the composition, textural, and sorption properties of a multichannel carbon filtering material developed for air purification from biological (infectious) contaminants. The filtering block has a cylindrical shape and is manufactured by extrusion of a plastic composition based on carbonized rice husk with the addition of binding agents, followed by staged thermal treatment (calcination, activation, and demineralization). The filter’s effectiveness is based on the inactivation of pathogenic microorganisms as the air passes through the porous surface of the sorbent, which is modified with broad-spectrum antiseptic agents (active against bacteria, bacilli, fungi, and protozoa). X-ray diffraction analysis revealed the presence of amorphous carbon in a tubostratic structure, with a predominance of sp- and sp²-hybridized carbon atoms not incorporated into regular graphene lattices. IR spectroscopy demonstrated the presence of reactive functional groups characteristic of the developed porous structure of the material, which is capable of selective sorption of antiseptic molecules. SEM surface analysis revealed an amorphous texture with a loose structure and elements in the form of spherical semi-ring formations formed by overlapping carbon plates. An experimental setup was also developed using cylindrical multichannel carbon blocks with a diameter of 48 mm, a length of 120 mm, and 100–120 longitudinal channels with a cross-section of 1 mm². The obtained results confirm the potential of the proposed material for use in air purification and disinfection systems under conditions of elevated biological risk.

air purification , filter , iodine , sorbent , sorption

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Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Scientific Production and Technical Center “Zhalyn”, Pavlodarskaya str. 11, Almaty, 050014, Kazakhstan
Faculty of Natural Sciences and Geography, Kazakh National Pedagogical University, Almaty, 050010, Kazakhstan
Department of Chemistry, Tsinghua University, 30 Shuangqing Rd, Haidian District, Beijing, 100084, China

Faculty of Chemistry and Chemical Technology
Scientific Production and Technical Center “Zhalyn”
Faculty of Natural Sciences and Geography
Department of Chemistry

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