Butman, Mikhail F.; Kochkina, Nataliya E.; Ovchinnikov, Nikolay L.; Krämer, Karl W. (2021). Photocatalytic Activity of Fibrous Ti/Ce Oxides Obtained by Hydrothermal Impregnation of Short Flax Fibers. Molecules, 26(11), p. 3399. Molecular Diversity Preservation International MDPI 10.3390/molecules26113399
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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 TiO2. The morphologies, textures, and structures of the photocatalysts were studied by scanning electron microscopy, low temperature N2 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 TiO2. This effect scaled with the Ce concentration. Ce improved the UV light absorption of the material. The Ti/Ce oxides contained Ce4+/Ce3+ pairs that played an important role in redox processes and intensified the photocatalytic activity.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Krämer, Karl |
Subjects: |
500 Science > 540 Chemistry |
ISSN: |
1420-3049 |
Publisher: |
Molecular Diversity Preservation International MDPI |
Language: |
English |
Submitter: |
Karl Krämer |
Date Deposited: |
23 Jun 2021 18:52 |
Last Modified: |
05 Dec 2022 15:51 |
Publisher DOI: |
10.3390/molecules26113399 |
BORIS DOI: |
10.48350/156930 |
URI: |
https://boris.unibe.ch/id/eprint/156930 |
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