Production, structure and photocatalytic properties of nanotubular TiO2
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DUCA, Gheorghe; COVALIOV, Victor; COVALIOVA, Olga. Production, structure and photocatalytic properties of nanotubular TiO2. In: Environmental Engineering and Management Journal. 2020, nr. 2(19), pp. 65-73. ISSN 1582-9596.
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Environmental Engineering and Management Journal
Numărul 2(19) / 2020 / ISSN 1582-9596

Production, structure and photocatalytic properties of nanotubular TiO2


Pag. 65-73

Duca Gheorghe1, Covaliov Victor2, Covaliova Olga1
 
1 Institute of Chemistry,
2 State University of Moldova
 
Disponibil în IBN: 21 octombrie 2020


Rezumat

Photocatalytic processes are among the most efficient treatment methods of waters polluted with recalcitrant organic substances. Nanotubular TiO2 arrays with photocatalytic properties were obtained in the process of titanium anodic oxidation in the fluoridecontaining electrolyte. Under the proposed conditions of electrolysis, a coherent system of tightly adjoining nanotubes was formed with the internal diameter of 60-80 nm and walls thickness up to 60-65 nm, the tubes height being dependent on process duration, reaching over 200 mkm. It was shown that it is the specifics of the formation, destruction and renewal of the barrier layer that determines the tubular structure of anodic titanium coatings formed. Various anodizing regimes were proposed to obtain the different TiO2-containing structures-nanotubular and fine dispersed ones. Subsequent annealing of nanotubular titanium dioxide provokes the series of structural-phase transformations, modifying its photocatalytic properties. The nanotubular systems thus obtained were tested as photo-catalysts, both as compact coatings and as fine dispersed particles, in the especially developed integrated photoreactor. It was shown that using the proposed equipment and photocatalysts produced, the efficient photodestruction of the persistent organic pollutants such as benozhiazol (BT) can be reached due to the combination of chemical and physical effects.

Cuvinte-cheie
Active radicals, nanotubes, Photocatalytic process, titanium dioxide