Belgorod State Technological University named after V. G. Shukhov (Belgorod, Russia):

Gubareva E. N., Postgraduate, ekaterina.bondareva@rambler.ru
Ogurtsova Yu. N.1, Associate Professor, Candidate of Engineering Sciences, ogurtsova.y@yandex.ru
Strokova V. V., Head of Chair, Doctor of Engineering Sciences, Professor, vvstrokova@gmail.com
Labuzova M. V., Postgraduate, labuzova326@mail.ru

Silica raw materials are widely used in many industries, especially in the manufacture of building materials. Among all rocks with rockforming silica minerals, chemogenic and biogenic sedimentary rocks are highly demanded as active (pozzolanic) mineral additives for composite binders. Raw materials containing amorphous silica are used to obtain composites of the TiO2–SiO₂ system with high photocatalytic activity. High sorption properties of silica raw materials are critical in the process of photocatalysis, since these indirectly affect the interaction between respective organic compounds and the photocatalyst surface for their oxidation to the safe compounds of H₂O and CO₂. Therefore, it seems promising to use silica sedimentary rocks as a photocatalyst carrier in the manufacture of photocatalytic composite materials (PCM) used in cement concrete. This work covers the study of the DIASIL diatomite fine powder and gaize of the Alekseevskoe deposit, as well as PCM obtained on their basis, by the sol-gel deposition of the photocatalytic agent at various precursor/solvent ratios. Preparation of the gaize feed material required disintegration in a jaw crusher and a ball mill to the particle size of –100 μm. The results for the evaluation of the surface acidic properties, the degree of CaO absorption from the lime solution, and the photocatalytic activity of the PCMs synthesized indicate the high efficiency of using the silica raw material studied as a substrate for the TiO₂ photocatalyst.
The study was carried out with a grant from the Russian Science Foundation (project No. 19-19-00263) using equipment based on the High Technology Center of BSTU named after V. G. Shukhov.

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