Calcination of metatitanic acid to nano-TiO₂ anatase

DOI: 10.62564/M4-DB1656

Dmytro Baranovskyi^1,2, Valerii Kolesnichenko^1,2, Andrey Ragulya<sup>1,2

1</sup>Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine
²NANOTECHCENTER LLC., Ukraine


Titanium dioxide crystallizes in three polymorphic modifications: anatase, rutile, and brookite. While rutile is acknowledged as the most thermodynamically stable polymorph of TiO₂, anatase commands considerable attention owing to its photocatalytic prowess. This study is focused on the synthesis of anatase, which finds diverse applications. The chosen method involves the decomposition of metatitanic acid, esteemed for its procedural simplicity and reliability in titanium oxide synthesis. Titanium dioxide was synthesized utilizing a multi-section rotary furnace developed by the Frantsevich Institute for Problems of Materials Science, NASU. Adjustment parameters of the powder synthesis process were meticulously balanced to minimize the ingress of powder particles into the air without compromising final product quality. The dependency of TiO₂ crystallite size, ranging from 9 to 13.5 nm, on gas flow rate from 2.5 to 16.5 l/min was elucidated. Furthermore, varying the reactor's rotational speed from 4 to 18 rpm yielded crystallite sizes ranging from 13.8 to 9.8 nm. Characterization via X-ray diffraction, scanning electron microscopy, and ASAP confirmed the predominance of anatase (approximately 99%) in the obtained powder, with particle sizes ranging from 20 to 30 nm and a specific surface area of 80-100 m²/g. The final product underwent comprehensive characterization employing various analytical techniques, including Fourier transform infrared spectroscopy, transmission electron microscopy, and thermogravimetric analysis.Assessment of the microclimate and dust levels within the working environment was also conducted. The estimated concentration of titanium dioxide in the air during TiO₂ nanopowder production stages did not surpass the maximum permissible limit, and no exceedance of occupational exposure limits for titanium and OBRV of titanium dioxide nanoparticles was recorded. [1].

Keywords
Anatase, SbD, itanium dioxide nanopowder,

Acknowledgments
This work was supported by the EU Horizon 2020 Research and Innovation Programme under Grant Agreement No. 862296 (SABYDOMA—Safety-by-design Of nanoMaterials— From Lab Manufacture to Governance and Communication: Progressing Up the TRL Ladder).

References
[1] Riabovol V.M., Comparative toxicological and hygienic assessment and prevention of the adverse effects of titanium dioxide nanopowders and titanium dioxide-silver nanocomposite in production conditions.: diss. …PhD in Medicine, specialty 222 Medicine: 22 Healthcare. O.O. Bogomolets National Medical University, Kyiv, 2023., P. 76-90.