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Rare-Earth-Modified Titania Nanoparticles: Molecular Insight into Synthesis and Photochemical Properties
[Image: see text] A molecular precursor approach to titania (anatase) nanopowders modified with different amounts of rare-earth elements (REEs: Eu, Sm, and Y) was developed using the interaction of REE nitrates with titanium alkoxides by a two-step solvothermal–combustion method. The nature of an em...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8493554/ https://www.ncbi.nlm.nih.gov/pubmed/34515470 http://dx.doi.org/10.1021/acs.inorgchem.1c02134 |
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author | Svensson, Fredric G. Cojocaru, Bogdan Qiu, Zhen Parvulescu, Vasile Edvinsson, Tomas Seisenbaeva, Gulaim A. Tiseanu, Carmen Kessler, Vadim G. |
author_facet | Svensson, Fredric G. Cojocaru, Bogdan Qiu, Zhen Parvulescu, Vasile Edvinsson, Tomas Seisenbaeva, Gulaim A. Tiseanu, Carmen Kessler, Vadim G. |
author_sort | Svensson, Fredric G. |
collection | PubMed |
description | [Image: see text] A molecular precursor approach to titania (anatase) nanopowders modified with different amounts of rare-earth elements (REEs: Eu, Sm, and Y) was developed using the interaction of REE nitrates with titanium alkoxides by a two-step solvothermal–combustion method. The nature of an emerging intermetallic intermediate was revealed unexpectedly for the applied conditions via a single-crystal study of the isolated bimetallic isopropoxide nitrate complex [Ti(2)Y((i)PrO)(9)(NO(3))(2)], a nonoxo-substituted compound. Powders of the final reaction products were characterized by powder X-ray diffraction, scanning electron microscopy–energy-dispersive spectroscopy, Fourier transform infrared, X-ray photoelectron spectroscopy, Raman spectroscopy, and photoluminescence (PL). The addition of REEs stabilized the anatase phase up to ca. 700 °C before phase transformation into rutile became evident. The photocatalytic activity of titania modified with Eu(3+) and Sm(3+) was compared with that of Degussa P25 titania as the control. PL studies indicated the incorporation of Eu and Sm cations into titania (anatase) at lower annealing temperatures (500 °C), but an exclusion to the surface occurred when the annealing temperature was increased to 700 °C. The efficiency of the modified titania was inferior to the control titania while illuminated within narrow wavelength intervals (445–465 and 510–530 nm), but when subjected to a wide range of visible radiation, the Eu(3+)- and Sm(3+)-modified titania outperformed the control, which was attributed both to doping of the band structure of TiO(2) with additional energy levels and to the surface chemistry of the REE-modified titania. |
format | Online Article Text |
id | pubmed-8493554 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-84935542021-10-06 Rare-Earth-Modified Titania Nanoparticles: Molecular Insight into Synthesis and Photochemical Properties Svensson, Fredric G. Cojocaru, Bogdan Qiu, Zhen Parvulescu, Vasile Edvinsson, Tomas Seisenbaeva, Gulaim A. Tiseanu, Carmen Kessler, Vadim G. Inorg Chem [Image: see text] A molecular precursor approach to titania (anatase) nanopowders modified with different amounts of rare-earth elements (REEs: Eu, Sm, and Y) was developed using the interaction of REE nitrates with titanium alkoxides by a two-step solvothermal–combustion method. The nature of an emerging intermetallic intermediate was revealed unexpectedly for the applied conditions via a single-crystal study of the isolated bimetallic isopropoxide nitrate complex [Ti(2)Y((i)PrO)(9)(NO(3))(2)], a nonoxo-substituted compound. Powders of the final reaction products were characterized by powder X-ray diffraction, scanning electron microscopy–energy-dispersive spectroscopy, Fourier transform infrared, X-ray photoelectron spectroscopy, Raman spectroscopy, and photoluminescence (PL). The addition of REEs stabilized the anatase phase up to ca. 700 °C before phase transformation into rutile became evident. The photocatalytic activity of titania modified with Eu(3+) and Sm(3+) was compared with that of Degussa P25 titania as the control. PL studies indicated the incorporation of Eu and Sm cations into titania (anatase) at lower annealing temperatures (500 °C), but an exclusion to the surface occurred when the annealing temperature was increased to 700 °C. The efficiency of the modified titania was inferior to the control titania while illuminated within narrow wavelength intervals (445–465 and 510–530 nm), but when subjected to a wide range of visible radiation, the Eu(3+)- and Sm(3+)-modified titania outperformed the control, which was attributed both to doping of the band structure of TiO(2) with additional energy levels and to the surface chemistry of the REE-modified titania. American Chemical Society 2021-09-13 2021-10-04 /pmc/articles/PMC8493554/ /pubmed/34515470 http://dx.doi.org/10.1021/acs.inorgchem.1c02134 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Svensson, Fredric G. Cojocaru, Bogdan Qiu, Zhen Parvulescu, Vasile Edvinsson, Tomas Seisenbaeva, Gulaim A. Tiseanu, Carmen Kessler, Vadim G. Rare-Earth-Modified Titania Nanoparticles: Molecular Insight into Synthesis and Photochemical Properties |
title | Rare-Earth-Modified Titania Nanoparticles: Molecular
Insight into Synthesis and Photochemical Properties |
title_full | Rare-Earth-Modified Titania Nanoparticles: Molecular
Insight into Synthesis and Photochemical Properties |
title_fullStr | Rare-Earth-Modified Titania Nanoparticles: Molecular
Insight into Synthesis and Photochemical Properties |
title_full_unstemmed | Rare-Earth-Modified Titania Nanoparticles: Molecular
Insight into Synthesis and Photochemical Properties |
title_short | Rare-Earth-Modified Titania Nanoparticles: Molecular
Insight into Synthesis and Photochemical Properties |
title_sort | rare-earth-modified titania nanoparticles: molecular
insight into synthesis and photochemical properties |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8493554/ https://www.ncbi.nlm.nih.gov/pubmed/34515470 http://dx.doi.org/10.1021/acs.inorgchem.1c02134 |
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