Umek, Polona ; Dürrschnabel, Michael ; Molina-Luna, Leopoldo ; Škapin, Srečo ; Korošec, Romana Cerc ; Bittencourt, Carla (2023)
The Role of Cerium Valence in the Conversion Temperature of H₂Ti₃O₇ Nanoribbons to TiO₂-B and Anatase Nanoribbons, and Further to Rutile.
In: Molecules, 28 (15)
doi: 10.3390/molecules28155838
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
CeO₂-TiO₂ is an important mixed oxide due to its catalytic properties, particularly in heterogeneous photocatalysis. This study presents a straightforward method to obtain 1D TiO₂ nanostructures decorated with CeO₂ nanoparticles at the surface. As the precursor, we used H₂Ti₃O₇ nanoribbons prepared from sodium titanate nanoribbons by ion exchange. Two cerium sources with an oxidation state of +3 and +4 were used to obtain mixed oxides. HAADF–STEM mapping of the Ce⁴⁺-modified nanoribbons revealed a thin continuous layer at the surface of the H₂Ti₃O₇ nanoribbons, while Ce³⁺ cerium ions intercalated partially between the titanate layers. The phase composition and morphology changes were monitored during calcination between 620 °C and 960 °C. Thermal treatment led to the formation of CeO₂ nanoparticles on the surface of the TiO₂ nanoribbons, whose size increased with the calcination temperature. The use of Ce⁴⁺ raised the temperature required for converting H₂Ti₃O₇ to TiO₂-B by approximately 200 °C, and the temperature for the formation of anatase. For the Ce³⁺ batch, the presence of cerium inhibited the conversion to rutile. Analysis of cerium oxidation states revealed the existence of both +4 and +3 in all calcined samples, regardless of the initial cerium oxidation state.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Umek, Polona ; Dürrschnabel, Michael ; Molina-Luna, Leopoldo ; Škapin, Srečo ; Korošec, Romana Cerc ; Bittencourt, Carla |
| Art des Eintrags: | Bibliographie |
| Titel: | The Role of Cerium Valence in the Conversion Temperature of H₂Ti₃O₇ Nanoribbons to TiO₂-B and Anatase Nanoribbons, and Further to Rutile |
| Sprache: | Englisch |
| Publikationsjahr: | 2023 |
| Ort: | Darmstadt |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Molecules |
| Jahrgang/Volume einer Zeitschrift: | 28 |
| (Heft-)Nummer: | 15 |
| Kollation: | 14 Seiten |
| DOI: | 10.3390/molecules28155838 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | CeO₂-TiO₂ is an important mixed oxide due to its catalytic properties, particularly in heterogeneous photocatalysis. This study presents a straightforward method to obtain 1D TiO₂ nanostructures decorated with CeO₂ nanoparticles at the surface. As the precursor, we used H₂Ti₃O₇ nanoribbons prepared from sodium titanate nanoribbons by ion exchange. Two cerium sources with an oxidation state of +3 and +4 were used to obtain mixed oxides. HAADF–STEM mapping of the Ce⁴⁺-modified nanoribbons revealed a thin continuous layer at the surface of the H₂Ti₃O₇ nanoribbons, while Ce³⁺ cerium ions intercalated partially between the titanate layers. The phase composition and morphology changes were monitored during calcination between 620 °C and 960 °C. Thermal treatment led to the formation of CeO₂ nanoparticles on the surface of the TiO₂ nanoribbons, whose size increased with the calcination temperature. The use of Ce⁴⁺ raised the temperature required for converting H₂Ti₃O₇ to TiO₂-B by approximately 200 °C, and the temperature for the formation of anatase. For the Ce³⁺ batch, the presence of cerium inhibited the conversion to rutile. Analysis of cerium oxidation states revealed the existence of both +4 and +3 in all calcined samples, regardless of the initial cerium oxidation state. |
| Freie Schlagworte: | TiO₂, TiO₂-B, anatase, CeO₂, impregnation, ion exchange, transformation, calcination, CeO₂-TiO₂, mixed oxides |
| Zusätzliche Informationen: | This article belongs to the Special Issue Nanocomposite and Hybrid Nanomaterial Applications |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Elektronenmikroskopie |
| Hinterlegungsdatum: | 02 Aug 2024 12:55 |
| Letzte Änderung: | 02 Aug 2024 12:55 |
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| Suche nach Titel in: | TUfind oder in Google |
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The Role of Cerium Valence in the Conversion Temperature of H₂Ti₃O₇ Nanoribbons to TiO₂-B and Anatase Nanoribbons, and Further to Rutile. (deposited 11 Sep 2023 12:28)
- The Role of Cerium Valence in the Conversion Temperature of H₂Ti₃O₇ Nanoribbons to TiO₂-B and Anatase Nanoribbons, and Further to Rutile. (deposited 02 Aug 2024 12:55) [Gegenwärtig angezeigt]
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