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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...

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Autores principales: Svensson, Fredric G., Cojocaru, Bogdan, Qiu, Zhen, Parvulescu, Vasile, Edvinsson, Tomas, Seisenbaeva, Gulaim A., Tiseanu, Carmen, Kessler, Vadim G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
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.
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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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