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Rare-Earth-Modified Titania Nanoparticles: Molecular Insight into Synthesis and Photochemical Properties

Svensson, Fredric and Cojocaru, Bogdan and Qiu, Zhen and Parvulescu, Vasile and Edvinsson, Tomas and Seisenbaeva, Gulaim and Kessler, Vadim G. and Kessler, Vadim (2021). Rare-Earth-Modified Titania Nanoparticles: Molecular Insight into Synthesis and Photochemical Properties. Inorganic Chemistry. 60 , 14820-14830
[Research article]

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Abstract

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 [Ti2Y((PrO)-Pr-i)(9)(NO3)(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 degrees C before phase transformation into rutile became evident. The photocatalytic activity of titania modified with Eu3+ and Sm3+ 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 degrees C), but an exclusion to the surface occurred when the annealing temperature was increased to 700 degrees 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 Eu3+- and Sm3+-modified titania outperformed the control, which was attributed both to doping of the band structure of TiO2 with additional energy levels and to the surface chemistry of the REE-modified titania.

Authors/Creators:Svensson, Fredric and Cojocaru, Bogdan and Qiu, Zhen and Parvulescu, Vasile and Edvinsson, Tomas and Seisenbaeva, Gulaim and Kessler, Vadim G. and Kessler, Vadim
Title:Rare-Earth-Modified Titania Nanoparticles: Molecular Insight into Synthesis and Photochemical Properties
Series Name/Journal:Inorganic Chemistry
Year of publishing :2021
Volume:60
Page range:14820-14830
Number of Pages:11
Publisher:AMER CHEMICAL SOC
ISSN:0020-1669
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Materials Chemistry
URN:NBN:urn:nbn:se:slu:epsilon-p-114358
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114358
Additional ID:
Type of IDID
DOI10.1021/acs.inorgchem.1c02134
Web of Science (WoS)000712069300042
ID Code:26130
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Molecular Sciences
Deposited By: SLUpub Connector
Deposited On:18 Nov 2021 13:28
Metadata Last Modified:18 Nov 2021 13:31

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