Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO
The CuO and NiO doped silica/titania nanocomposites were investigated using ultraviolet-visible light diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the samples was studied in photooxidation of caffeine (CAF). The band gaps we...
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| Format: | Article |
| Language: | English |
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Chuiko Institute of Surface Chemistry of NAS of Ukraine
2014-11-01
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| Series: | Хімія, фізика та технологія поверхні |
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| Online Access: | https://cpts.com.ua/index.php/cpts/article/view/303 |
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| author | M. A. Nazarkovsky V. M. Gun'ko G. Wójcik B. Czech A. Sobieszek J. Skubiszewska-Zięba W. Janusz E. Skwarek |
| author_facet | M. A. Nazarkovsky V. M. Gun'ko G. Wójcik B. Czech A. Sobieszek J. Skubiszewska-Zięba W. Janusz E. Skwarek |
| author_sort | M. A. Nazarkovsky |
| collection | DOAJ |
| description | The CuO and NiO doped silica/titania nanocomposites were investigated using ultraviolet-visible light diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the samples was studied in photooxidation of caffeine (CAF). The band gaps were calculated using the Tauc plot for non-direct allowed optical transitions except a system at CNiO = 30 wt. % analyzed using a direct allowed optical transition. Copper oxide concentration increase leads to almost exponential diminution of the band gap. The band gap of NiO doped composites demonstrates almost linear change with CNiO. According to the XPS data, the doping oxides are completely absent at a composite surface. All the composites are shown to be more effective photocatalysts than titania Degussa P25. |
| format | Article |
| id | doaj-art-8554e522e9144e918c4d7d4e205ddd62 |
| institution | Kabale University |
| issn | 2079-1704 2518-1238 |
| language | English |
| publishDate | 2014-11-01 |
| publisher | Chuiko Institute of Surface Chemistry of NAS of Ukraine |
| record_format | Article |
| series | Хімія, фізика та технологія поверхні |
| spelling | doaj-art-8554e522e9144e918c4d7d4e205ddd622025-08-20T03:55:53ZengChuiko Institute of Surface Chemistry of NAS of UkraineХімія, фізика та технологія поверхні2079-17042518-12382014-11-015410.15407/hftp05.04.421Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiOM. A. Nazarkovsky0V. M. Gun'ko1G. Wójcik2B. Czech3A. Sobieszek4J. Skubiszewska-Zięba5W. Janusz6E. Skwarek7Chuiko Institute of Surface Chemistry of National Academy of Sciences of UkraineChuiko Institute of Surface Chemistry of National Academy of Sciences of UkraineMaria Curie-Skłodowska UniversityMaria Curie-Skłodowska UniversityMaria Curie-Skłodowska UniversityMaria Curie-Skłodowska UniversityMaria Curie-Skłodowska UniversityMaria Curie-Skłodowska UniversityThe CuO and NiO doped silica/titania nanocomposites were investigated using ultraviolet-visible light diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the samples was studied in photooxidation of caffeine (CAF). The band gaps were calculated using the Tauc plot for non-direct allowed optical transitions except a system at CNiO = 30 wt. % analyzed using a direct allowed optical transition. Copper oxide concentration increase leads to almost exponential diminution of the band gap. The band gap of NiO doped composites demonstrates almost linear change with CNiO. According to the XPS data, the doping oxides are completely absent at a composite surface. All the composites are shown to be more effective photocatalysts than titania Degussa P25.https://cpts.com.ua/index.php/cpts/article/view/303titaniacaffeineP25XPSphotocatalystsHeraeus reactor |
| spellingShingle | M. A. Nazarkovsky V. M. Gun'ko G. Wójcik B. Czech A. Sobieszek J. Skubiszewska-Zięba W. Janusz E. Skwarek Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO Хімія, фізика та технологія поверхні titania caffeine P25 XPS photocatalysts Heraeus reactor |
| title | Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO |
| title_full | Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO |
| title_fullStr | Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO |
| title_full_unstemmed | Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO |
| title_short | Band-Gap Change and Photocatalytic Activity of Silica/Titania Composites Associated with Incorporation of CuO and NiO |
| title_sort | band gap change and photocatalytic activity of silica titania composites associated with incorporation of cuo and nio |
| topic | titania caffeine P25 XPS photocatalysts Heraeus reactor |
| url | https://cpts.com.ua/index.php/cpts/article/view/303 |
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