TY - JOUR AU - Mironyuk, I. AU - Danyliuk, N. AU - Turovska, L. AU - Mykytyn, I. PY - 2022/12/19 Y2 - 2024/03/28 TI - Structural, morphological and photocatalytic properties of TiO2 obtained by thermolytic decomposition of the [Ti(OH2)6]3+•3Cl¯ aquacomplex: Array JF - Physics and Chemistry of Solid State JA - Phys. Chem. Sol. State VL - 23 IS - 4 SE - Scientific articles (Chemistry) DO - 10.15330/pcss.23.4.741-755 UR - https://journals.pnu.edu.ua/index.php/pcss/article/view/6309 SP - 741-755 AB - <p>Thermolytic decomposition in a chloride-acid medium of a titanium aquacomplex precursor solution [Ti(OH<sub>2</sub>)<sub>6</sub>]<sup>3+</sup>•3Cl<sup>¯ </sup>as a result of its boiling at a temperature of (110-114)&nbsp;<sup>0</sup>С is accompanied by precursor hydrolysis and the formation of hydrate molecules Ti(OH)<sub>3</sub>Cl•2Н<sub>2</sub>О, which, as a result of condensation, provide the formation of rutile ТіО<sub>2 </sub>with rod-shaped particles (30-80) nm long and (8-20) nm in diameter, combined into flower-shaped associates with a diameter of (200-280) nm.&nbsp;IR spectroscopic studies of the precursor hydrolysis products and the synthesized oxide material show that the geometric parameters of ТіО<sub>5</sub>Cl octahedra of Ti(OH)<sub>3</sub>Cl •2Н<sub>2</sub>О hydrate molecules are close to those of ТіО<sub>6</sub> octahedra of ТіО<sub>2 </sub>rutile. The average Ti-O interatomic distance of octahedra of titanium-containing hydrate molecules is a kind of template that directs the process of ТіО<sub>2</sub> crystallization towards the formation of rutile. Rutile ТіО<sub>2</sub> nanopowder synthesized in this way is an effective photocatalyst for the photooxidation of organic dyes in an aqueous medium by UV radiation. The photocatalytic activity of the synthesized rutile ТіО<sub>2 </sub>was determined by neutralization of Congo Red (CR) dye dissolved in an aqueous medium. The effectiveness of TiO<sub>2</sub> was studied by examining the effect of TiO<sub>2</sub> amount and Н<sub>2</sub>О<sub>2 </sub>concentration. It has been established that complete bleaching of the dye is achieved in just 10 minutes of UV irradiation at a photocatalyst concentration of 1.5&nbsp;g/L, an Н<sub>2</sub>О<sub>2</sub> concentration of 5&nbsp;mM, and an initial CR dye concentration of 5&nbsp;mg/L, at reaction rate constant of 2.1959 min<sup>-1</sup>.</p> ER -