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Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers

Fibrous Ti/Ce oxide photocatalysts were prepared for the first time by a biomimetic solution process using short flax fibers (flax straw processing waste) as a biotemplate. Titanium polyhydroxy complex solutions with 3% and 5% cerium were used as precursors. Flax fibers were impregnated in an autocl...

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Autores principales: Butman, Mikhail F., Kochkina, Nataliya E., Ovchinnikov, Nikolay L., Krämer, Karl W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8199952/
https://www.ncbi.nlm.nih.gov/pubmed/34205177
http://dx.doi.org/10.3390/molecules26113399
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author Butman, Mikhail F.
Kochkina, Nataliya E.
Ovchinnikov, Nikolay L.
Krämer, Karl W.
author_facet Butman, Mikhail F.
Kochkina, Nataliya E.
Ovchinnikov, Nikolay L.
Krämer, Karl W.
author_sort Butman, Mikhail F.
collection PubMed
description Fibrous Ti/Ce oxide photocatalysts were prepared for the first time by a biomimetic solution process using short flax fibers (flax straw processing waste) as a biotemplate. Titanium polyhydroxy complex solutions with 3% and 5% cerium were used as precursors. Flax fibers were impregnated in an autoclave under hydrothermal conditions. Ti/Ce oxides were obtained from the biotemplate by annealing at 600 °C. The photocatalytic activity of the Ti/Ce oxides was studied by the adsorption and decomposition of the dye rhodamine B under UV irradiation. The photocatalytic decomposition of the dye was 50% and 75% faster for Ti/Ce oxides with 3% and 5% Ce, respectively, than for the analogous undoped fibrous TiO(2). The morphologies, textures, and structures of the photocatalysts were studied by scanning electron microscopy, low temperature N(2) adsorption/desorption, UV-Vis spectroscopy, and X-ray and XPS analytical methods. It was shown that the introduction of Ce into the precursor solution increased the surface irregularity of the Ti/Ce oxide crystallites compared to pure TiO(2). This effect scaled with the Ce concentration. Ce improved the UV light absorption of the material. The Ti/Ce oxides contained Ce(4+)/Ce(3+) pairs that played an important role in redox processes and intensified the photocatalytic activity.
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spelling pubmed-81999522021-06-14 Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers Butman, Mikhail F. Kochkina, Nataliya E. Ovchinnikov, Nikolay L. Krämer, Karl W. Molecules Article Fibrous Ti/Ce oxide photocatalysts were prepared for the first time by a biomimetic solution process using short flax fibers (flax straw processing waste) as a biotemplate. Titanium polyhydroxy complex solutions with 3% and 5% cerium were used as precursors. Flax fibers were impregnated in an autoclave under hydrothermal conditions. Ti/Ce oxides were obtained from the biotemplate by annealing at 600 °C. The photocatalytic activity of the Ti/Ce oxides was studied by the adsorption and decomposition of the dye rhodamine B under UV irradiation. The photocatalytic decomposition of the dye was 50% and 75% faster for Ti/Ce oxides with 3% and 5% Ce, respectively, than for the analogous undoped fibrous TiO(2). The morphologies, textures, and structures of the photocatalysts were studied by scanning electron microscopy, low temperature N(2) adsorption/desorption, UV-Vis spectroscopy, and X-ray and XPS analytical methods. It was shown that the introduction of Ce into the precursor solution increased the surface irregularity of the Ti/Ce oxide crystallites compared to pure TiO(2). This effect scaled with the Ce concentration. Ce improved the UV light absorption of the material. The Ti/Ce oxides contained Ce(4+)/Ce(3+) pairs that played an important role in redox processes and intensified the photocatalytic activity. MDPI 2021-06-03 /pmc/articles/PMC8199952/ /pubmed/34205177 http://dx.doi.org/10.3390/molecules26113399 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Butman, Mikhail F.
Kochkina, Nataliya E.
Ovchinnikov, Nikolay L.
Krämer, Karl W.
Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers
title Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers
title_full Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers
title_fullStr Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers
title_full_unstemmed Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers
title_short Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers
title_sort photocatalytic activity of fibrous ti/ce oxides obtained by hydrothermal impregnation of short flax fibers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8199952/
https://www.ncbi.nlm.nih.gov/pubmed/34205177
http://dx.doi.org/10.3390/molecules26113399
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