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Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid

[Image: see text] Niobium doping of TiO(2) creates a conductive material with many new energy applications. When TiO(2) is precipitated from HCl solutions containing minor Nb, the Nb in solution is quantitatively deposited with the TiO(2). Here, we investigate the structure of Nb doped in anatase an...

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Autores principales: Haverkamp, Richard G., Kappen, Peter, Sizeland, Katie H., Wallwork, Kia S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9386810/
https://www.ncbi.nlm.nih.gov/pubmed/35990431
http://dx.doi.org/10.1021/acsomega.2c02676
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author Haverkamp, Richard G.
Kappen, Peter
Sizeland, Katie H.
Wallwork, Kia S.
author_facet Haverkamp, Richard G.
Kappen, Peter
Sizeland, Katie H.
Wallwork, Kia S.
author_sort Haverkamp, Richard G.
collection PubMed
description [Image: see text] Niobium doping of TiO(2) creates a conductive material with many new energy applications. When TiO(2) is precipitated from HCl solutions containing minor Nb, the Nb in solution is quantitatively deposited with the TiO(2). Here, we investigate the structure of Nb doped in anatase and rutile produced from ilmenite digested in hydrochloric acid. Nb K-edge X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) are used to characterize the environment of 0.08 atom % Nb doped in TiO(2). XANES shows clear structural differences between Nb-doped anatase and rutile. EXAFS for Nb demonstrates that Nb occupies a Ti site in TiO(2) with no near neighbors of Nb. Hydrolysis of Ti and Nb from acid solution, followed by calcination, leads to a well dispersed doped material, with no segregation of Nb. Production of Nb-doped TiO(2) by this method may be able to supply future demand for large quantities of the material and in energy applications where a low cost of production, from readily available natural resources, would be highly desirable.
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spelling pubmed-93868102022-08-19 Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid Haverkamp, Richard G. Kappen, Peter Sizeland, Katie H. Wallwork, Kia S. ACS Omega [Image: see text] Niobium doping of TiO(2) creates a conductive material with many new energy applications. When TiO(2) is precipitated from HCl solutions containing minor Nb, the Nb in solution is quantitatively deposited with the TiO(2). Here, we investigate the structure of Nb doped in anatase and rutile produced from ilmenite digested in hydrochloric acid. Nb K-edge X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) are used to characterize the environment of 0.08 atom % Nb doped in TiO(2). XANES shows clear structural differences between Nb-doped anatase and rutile. EXAFS for Nb demonstrates that Nb occupies a Ti site in TiO(2) with no near neighbors of Nb. Hydrolysis of Ti and Nb from acid solution, followed by calcination, leads to a well dispersed doped material, with no segregation of Nb. Production of Nb-doped TiO(2) by this method may be able to supply future demand for large quantities of the material and in energy applications where a low cost of production, from readily available natural resources, would be highly desirable. American Chemical Society 2022-08-04 /pmc/articles/PMC9386810/ /pubmed/35990431 http://dx.doi.org/10.1021/acsomega.2c02676 Text en © 2022 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 Haverkamp, Richard G.
Kappen, Peter
Sizeland, Katie H.
Wallwork, Kia S.
Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid
title Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid
title_full Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid
title_fullStr Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid
title_full_unstemmed Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid
title_short Niobium K-Edge X-ray Absorption Spectroscopy of Doped TiO(2) Produced from Ilmenite Digested in Hydrochloric Acid
title_sort niobium k-edge x-ray absorption spectroscopy of doped tio(2) produced from ilmenite digested in hydrochloric acid
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9386810/
https://www.ncbi.nlm.nih.gov/pubmed/35990431
http://dx.doi.org/10.1021/acsomega.2c02676
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