Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV Excitability
The photocatalytic performances of doped and non-doped TiO<sub>2</sub> photocatalysts (TiO<sub>2</sub>-s) were compared under solar and various types of artificial irradiation using phenol as a model contaminant. Non-doped (mainly anatase phase) TiO<sub>2</sub>-s...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/2073-4344/12/12/1492 |
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| author | Gábor Veréb Tamás Gyulavári Orsolya Virág Tünde Alapi Klara Hernadi Zsolt Pap |
| author_facet | Gábor Veréb Tamás Gyulavári Orsolya Virág Tünde Alapi Klara Hernadi Zsolt Pap |
| author_sort | Gábor Veréb |
| collection | DOAJ |
| description | The photocatalytic performances of doped and non-doped TiO<sub>2</sub> photocatalysts (TiO<sub>2</sub>-s) were compared under solar and various types of artificial irradiation using phenol as a model contaminant. Non-doped (mainly anatase phase) TiO<sub>2</sub>-s had significantly higher photocatalytic efficiency than highly visible-light-active TiO<sub>2</sub>-s under natural solar irradiation. To explain these unexpected results, we measured the wavelength dependence of photocatalytic efficiency at six different wavelength ranges (λ = 300–650 nm). For this purpose, UV fluorescence tubes and five LED lights of different colors (violet, blue, green, yellow, and red) were used to activate the photocatalysts. The photon fluxes of the irradiation were measured, and apparent quantum yields were calculated for all irradiation conditions. The highest apparent quantum yield was 1.43% for our own TiO<sub>2</sub> (prepared via flame hydrolysis) under UV irradiation. However, apparent quantum yields were significantly lower (by 1–2 orders of magnitude) in the visible range, even for the most visible-light-active TiO<sub>2</sub>. |
| first_indexed | 2024-03-09T17:13:33Z |
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| id | doaj.art-a67fc5c0ac84482190a002913964e5ae |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T17:13:33Z |
| publishDate | 2022-11-01 |
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| record_format | Article |
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| spelling | doaj.art-a67fc5c0ac84482190a002913964e5ae2023-11-24T13:49:50ZengMDPI AGCatalysts2073-43442022-11-011212149210.3390/catal12121492Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV ExcitabilityGábor Veréb0Tamás Gyulavári1Orsolya Virág2Tünde Alapi3Klara Hernadi4Zsolt Pap5Department of Biosystems Engineering, Faculty of Engineering, University of Szeged, Moszkvai Blvd. 9, H-6725 Szeged, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla Sqr. 1, H-6720 Szeged, HungaryDepartment of Biosystems Engineering, Faculty of Engineering, University of Szeged, Moszkvai Blvd. 9, H-6725 Szeged, HungaryDepartment of Inorganic and Analytical Chemistry, Institute of Chemistry, University of Szeged, Dóm Sqr. 7, H-6720 Szeged, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla Sqr. 1, H-6720 Szeged, HungaryDepartment of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla Sqr. 1, H-6720 Szeged, HungaryThe photocatalytic performances of doped and non-doped TiO<sub>2</sub> photocatalysts (TiO<sub>2</sub>-s) were compared under solar and various types of artificial irradiation using phenol as a model contaminant. Non-doped (mainly anatase phase) TiO<sub>2</sub>-s had significantly higher photocatalytic efficiency than highly visible-light-active TiO<sub>2</sub>-s under natural solar irradiation. To explain these unexpected results, we measured the wavelength dependence of photocatalytic efficiency at six different wavelength ranges (λ = 300–650 nm). For this purpose, UV fluorescence tubes and five LED lights of different colors (violet, blue, green, yellow, and red) were used to activate the photocatalysts. The photon fluxes of the irradiation were measured, and apparent quantum yields were calculated for all irradiation conditions. The highest apparent quantum yield was 1.43% for our own TiO<sub>2</sub> (prepared via flame hydrolysis) under UV irradiation. However, apparent quantum yields were significantly lower (by 1–2 orders of magnitude) in the visible range, even for the most visible-light-active TiO<sub>2</sub>.https://www.mdpi.com/2073-4344/12/12/1492TiO<sub>2</sub>visible lightUV lightsolar irradiationapparent quantum yield |
| spellingShingle | Gábor Veréb Tamás Gyulavári Orsolya Virág Tünde Alapi Klara Hernadi Zsolt Pap Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV Excitability Catalysts TiO<sub>2</sub> visible light UV light solar irradiation apparent quantum yield |
| title | Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV Excitability |
| title_full | Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV Excitability |
| title_fullStr | Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV Excitability |
| title_full_unstemmed | Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV Excitability |
| title_short | Wavelength Dependence of the Photocatalytic Performance of Pure and Doped TiO<sub>2</sub> Photocatalysts—A Reflection on the Importance of UV Excitability |
| title_sort | wavelength dependence of the photocatalytic performance of pure and doped tio sub 2 sub photocatalysts a reflection on the importance of uv excitability |
| topic | TiO<sub>2</sub> visible light UV light solar irradiation apparent quantum yield |
| url | https://www.mdpi.com/2073-4344/12/12/1492 |
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