Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light
Platinum and nitrogen co-doped titania films of different surface morphologies obtained via a sol-gel process have been tested for tetracycline hydrochloride photocatalytic decomposition under simulated solar light. Titania crystallization to anatase is shown by XRD for all films. A shift of the ban...
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MDPI AG
2020-09-01
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| Online Access: | https://www.mdpi.com/2073-4344/10/9/1074 |
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| author | Daryna Ihnatiuk Camilla Tossi Ilkka Tittonen Oksana Linnik |
| author_facet | Daryna Ihnatiuk Camilla Tossi Ilkka Tittonen Oksana Linnik |
| author_sort | Daryna Ihnatiuk |
| collection | DOAJ |
| description | Platinum and nitrogen co-doped titania films of different surface morphologies obtained via a sol-gel process have been tested for tetracycline hydrochloride photocatalytic decomposition under simulated solar light. Titania crystallization to anatase is shown by XRD for all films. A shift of the bandgap edge toward the visible region in absorption spectra and, consequently, a narrowing of the bandgap is observed for some films doped with nitrogen and/or exposed to UV pretreatment. The surface peculiarities of the samples are presented by an SEM and TEM investigation. The surface saturation by Pt and N with a homogeneous distribution of Pt ions on the surface as well as bulk as established by XPS and EDS data can be achieved with a certain synthesis procedure. The influence of the platinum content and of the pretreatment procedure on the state and atomic surface concentration of incorporated nitrogen and platinum is studied by XPS analysis: substitutional and interstitial nitrogen, non-metal containing fragments, Pt<sup>0</sup>, Pt<sup>2+</sup> and Pt<sup>4+</sup> ions. The photocatalytic activity of the films is ruled by the presence of Pt<sup>2+</sup> ions and N rather than Pt<sup>0</sup>. The formation of the polycrystalline titania structure and Pt<sup>0</sup> nanoparticles (NPs) is confirmed by TEM and electron diffraction images. The mechanism of primary photocatalytic processes is proposed. |
| first_indexed | 2024-03-10T16:15:32Z |
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| id | doaj.art-4c347f4bb12e43e594ff659e417ed1a1 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T16:15:32Z |
| publishDate | 2020-09-01 |
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| record_format | Article |
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| spelling | doaj.art-4c347f4bb12e43e594ff659e417ed1a12023-11-20T14:07:06ZengMDPI AGCatalysts2073-43442020-09-01109107410.3390/catal10091074Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar LightDaryna Ihnatiuk0Camilla Tossi1Ilkka Tittonen2Oksana Linnik3Micro and Quantum Systems Group, Department of Electronics and Nanoengineering, Aalto-University, Tietotie, 3, 02150 Espoo, FinlandMicro and Quantum Systems Group, Department of Electronics and Nanoengineering, Aalto-University, Tietotie, 3, 02150 Espoo, FinlandMicro and Quantum Systems Group, Department of Electronics and Nanoengineering, Aalto-University, Tietotie, 3, 02150 Espoo, FinlandChuiko Institute of Surface Chemistry of the NAS of Ukraine. General Naumov Str., 17, 03680 Kyiv, UkrainePlatinum and nitrogen co-doped titania films of different surface morphologies obtained via a sol-gel process have been tested for tetracycline hydrochloride photocatalytic decomposition under simulated solar light. Titania crystallization to anatase is shown by XRD for all films. A shift of the bandgap edge toward the visible region in absorption spectra and, consequently, a narrowing of the bandgap is observed for some films doped with nitrogen and/or exposed to UV pretreatment. The surface peculiarities of the samples are presented by an SEM and TEM investigation. The surface saturation by Pt and N with a homogeneous distribution of Pt ions on the surface as well as bulk as established by XPS and EDS data can be achieved with a certain synthesis procedure. The influence of the platinum content and of the pretreatment procedure on the state and atomic surface concentration of incorporated nitrogen and platinum is studied by XPS analysis: substitutional and interstitial nitrogen, non-metal containing fragments, Pt<sup>0</sup>, Pt<sup>2+</sup> and Pt<sup>4+</sup> ions. The photocatalytic activity of the films is ruled by the presence of Pt<sup>2+</sup> ions and N rather than Pt<sup>0</sup>. The formation of the polycrystalline titania structure and Pt<sup>0</sup> nanoparticles (NPs) is confirmed by TEM and electron diffraction images. The mechanism of primary photocatalytic processes is proposed.https://www.mdpi.com/2073-4344/10/9/1074photocatalysissol-geltitaniaplatinumnitrogenXPS |
| spellingShingle | Daryna Ihnatiuk Camilla Tossi Ilkka Tittonen Oksana Linnik Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light Catalysts photocatalysis sol-gel titania platinum nitrogen XPS |
| title | Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light |
| title_full | Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light |
| title_fullStr | Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light |
| title_full_unstemmed | Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light |
| title_short | Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light |
| title_sort | effect of synthesis conditions of nitrogen and platinum co doped titania films on the photocatalytic performance under simulated solar light |
| topic | photocatalysis sol-gel titania platinum nitrogen XPS |
| url | https://www.mdpi.com/2073-4344/10/9/1074 |
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