Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and Argon
Titania is very famous photocatalyst for decomposition of organic pollutants. Its photocatalytic properties significantly depend on the morphology and chemical composition of the samples. Herein, the TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O nanoheterostructures have been syn...
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MDPI AG
2022-11-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/22/8080 |
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| author | Elizaveta Konstantinova Timofey Savchuk Olga Pinchuk Ekaterina Kytina Elizaveta Ivanova Lidiya Volkova Vladimir Zaitsev Alexander Pavlikov Elena Elizarova |
| author_facet | Elizaveta Konstantinova Timofey Savchuk Olga Pinchuk Ekaterina Kytina Elizaveta Ivanova Lidiya Volkova Vladimir Zaitsev Alexander Pavlikov Elena Elizarova |
| author_sort | Elizaveta Konstantinova |
| collection | DOAJ |
| description | Titania is very famous photocatalyst for decomposition of organic pollutants. Its photocatalytic properties significantly depend on the morphology and chemical composition of the samples. Herein, the TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O nanoheterostructures have been synthesized and the effect of heat treatment performed in molecular atmospheres of air and argon on their photoelectrochemical and photocatalytic properties has been studied. The prepared samples have a higher reaction rate constant compared to TiO<sub>2</sub> nanotubes in the decomposition reaction of methylene blue molecules. It is established that in argon treated nanoheterostructures, the copper oxide is present in two phases, CuO and Cu<sub>2</sub>O, while in air treated ones there is only CuO. In the TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O samples, Cu<sup>2+</sup> ions and molecular O<sub>2</sub><sup>−</sup> radicals were detected while in TiO<sub>2</sub> nanotubes only carbon dangling bond defects are present. The dynamics of O<sub>2</sub><sup>−</sup> radicals under illumination are discussed. It was shown that the TiO<sub>2</sub> nanotubes do not exhibit photocatalytic activity under visible light. The mechanism of the photocatalytic reaction on the surface of the TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O samples was proposed. It is assumed that a photocatalytic decomposition of organic molecules under visible light at the surface of the nanoheterostructures under investigation is realized mainly by the reaction of these molecules with photogenerated O<sub>2</sub><sup>−</sup> radicals. The results obtained are completely original and indicate the high promise of the prepared photocatalysts. |
| first_indexed | 2024-03-09T18:07:15Z |
| format | Article |
| id | doaj.art-af50d0c9164a4fc1a0e4b72101745c1a |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T18:07:15Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-af50d0c9164a4fc1a0e4b72101745c1a2023-11-24T09:26:09ZengMDPI AGMolecules1420-30492022-11-012722808010.3390/molecules27228080Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and ArgonElizaveta Konstantinova0Timofey Savchuk1Olga Pinchuk2Ekaterina Kytina3Elizaveta Ivanova4Lidiya Volkova5Vladimir Zaitsev6Alexander Pavlikov7Elena Elizarova8Physics Department, M.V. Lomonosov Moscow State University, Moscow 119991, RussiaPhysics Department, M.V. Lomonosov Moscow State University, Moscow 119991, RussiaInstitute of Advanced Materials and Technologies, National Research University of Electronic Technology—MIET, Moscow 124498, RussiaPhysics Department, M.V. Lomonosov Moscow State University, Moscow 119991, RussiaPhystech School of Electronics, Photonics and Molecular Physics, Moscow Institute of Physics and Technology (National Research University), Moscow 141701, RussiaDepartment of Structural Analysis and Metrology, Institute of Nanotechnology of Microelectronics of the Russian Academy of Sciences, Moscow 119991, RussiaPhysics Department, M.V. Lomonosov Moscow State University, Moscow 119991, RussiaPhysics Department, M.V. Lomonosov Moscow State University, Moscow 119991, RussiaDepartment of Food Hygiene and Toxycology, Institute of Vocational Education, I.M. Sechenov First Moscow State Medical University (Sechenov University), Moscow 119435, RussiaTitania is very famous photocatalyst for decomposition of organic pollutants. Its photocatalytic properties significantly depend on the morphology and chemical composition of the samples. Herein, the TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O nanoheterostructures have been synthesized and the effect of heat treatment performed in molecular atmospheres of air and argon on their photoelectrochemical and photocatalytic properties has been studied. The prepared samples have a higher reaction rate constant compared to TiO<sub>2</sub> nanotubes in the decomposition reaction of methylene blue molecules. It is established that in argon treated nanoheterostructures, the copper oxide is present in two phases, CuO and Cu<sub>2</sub>O, while in air treated ones there is only CuO. In the TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O samples, Cu<sup>2+</sup> ions and molecular O<sub>2</sub><sup>−</sup> radicals were detected while in TiO<sub>2</sub> nanotubes only carbon dangling bond defects are present. The dynamics of O<sub>2</sub><sup>−</sup> radicals under illumination are discussed. It was shown that the TiO<sub>2</sub> nanotubes do not exhibit photocatalytic activity under visible light. The mechanism of the photocatalytic reaction on the surface of the TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O samples was proposed. It is assumed that a photocatalytic decomposition of organic molecules under visible light at the surface of the nanoheterostructures under investigation is realized mainly by the reaction of these molecules with photogenerated O<sub>2</sub><sup>−</sup> radicals. The results obtained are completely original and indicate the high promise of the prepared photocatalysts.https://www.mdpi.com/1420-3049/27/22/8080organic molecules photodegradationTiO<sub>2</sub> nanotubes/Cu<sub>x</sub>Onanoheterostructuresphotocatalytic activitymolecular oxygen anion radicalscopper ions |
| spellingShingle | Elizaveta Konstantinova Timofey Savchuk Olga Pinchuk Ekaterina Kytina Elizaveta Ivanova Lidiya Volkova Vladimir Zaitsev Alexander Pavlikov Elena Elizarova Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and Argon Molecules organic molecules photodegradation TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O nanoheterostructures photocatalytic activity molecular oxygen anion radicals copper ions |
| title | Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and Argon |
| title_full | Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and Argon |
| title_fullStr | Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and Argon |
| title_full_unstemmed | Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and Argon |
| title_short | Photoelectron Properties and Organic Molecules Photodegradation Activity of Titania Nanotubes with Cu<sub>x</sub>O Nanoparticles Heat Treated in Air and Argon |
| title_sort | photoelectron properties and organic molecules photodegradation activity of titania nanotubes with cu sub x sub o nanoparticles heat treated in air and argon |
| topic | organic molecules photodegradation TiO<sub>2</sub> nanotubes/Cu<sub>x</sub>O nanoheterostructures photocatalytic activity molecular oxygen anion radicals copper ions |
| url | https://www.mdpi.com/1420-3049/27/22/8080 |
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