Contribution of photocatalytic and Fenton-based processes in nanotwin structured anodic TiO2 nanotube layers modified by Ce and V
Thirunavukkarasu G. K., Gowrisankaran S., Caplovicova M., Satrapinskyy L., Gregor M., Lavrikova A., Gregus J., Halko R., Plesch G,, Motola M., Monfort O.
Dalton Transactions 51, 10763-10772 (2022)
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Abstract: In the present work, nanotwinned structured TiO2 nanotube (TNT) layers are prepared by electrochemical anodization technique to form the anatase phase and by surface modification via spin-coating of Ce and V precursors to form Ce-TNT and V-TNT, respectively. The surface and cross-sectional images by SEM revealed that nanotubes have an average diameter of ~130 nm and a length of ~14 µm. Additionally, TEM images revealed the nanotwinned structure of the nanotubes, especially anatase (112) twin surfaces, that increases the transport of photogenerated charges. The photo-induced degradation of CAF by TNT, Ce-TNT, V-TNT led to the degradation extent of 16%, 26% and 33%, respectively, whereas it increased to 26%, 38%, and 46% in the presence of H2O2, owing to the synergy between photocatalysis and Fenton-based processes. This synergetic effect accounts for about 10% of the total degradation extent of CAF. Finally, the mechanism of the photo-induced degradation of CAF was investigated. The main oxidative species were the hydroxyl radicals and the better efficiency of V-TNT over Ce-TNT and TNT was ascribed to its negative surface, thus improving interactions with CAF.
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