One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol
Double modifications of TiO2 by doping with WO3 and by dispersing on a SiO2 support were made by the one-pot sol-gel method. Doping with W shifts the TiO2 band gap energy from 3.2 eV to around 3.06 eV. The surface area of the supported W-TiO2/SiO2 material was significantly increased, by approximate...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2019/5748586 |
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| author | Ulises Arellano Sánchez Lifang Chen Jin An Wang Luis Enrique Noreña Maximiliano Asomoza Silvia Solis Xiaolong Zhou Yueqin Song Jing Liu |
| author_facet | Ulises Arellano Sánchez Lifang Chen Jin An Wang Luis Enrique Noreña Maximiliano Asomoza Silvia Solis Xiaolong Zhou Yueqin Song Jing Liu |
| author_sort | Ulises Arellano Sánchez |
| collection | DOAJ |
| description | Double modifications of TiO2 by doping with WO3 and by dispersing on a SiO2 support were made by the one-pot sol-gel method. Doping with W shifts the TiO2 band gap energy from 3.2 eV to around 3.06 eV. The surface area of the supported W-TiO2/SiO2 material was significantly increased, by approximately 3 times, in comparison to the bare TiO2. The photocatalytic activities of the catalysts were evaluated in the degradation reaction of p-nitrophenol in aqueous solution and basic medium. After 240 min of photodegradation, more than approximately 99% p-nitrophenol could be mineralized with the most active W-TiO2/SiO2 catalyst. Under UV irradiation, p-nitrophenol was initially photodegraded into hydroquinone and benzosemiquinone intermediates, which were further degraded into smaller fragments such as organic carboxylic acids and finally completely mineralized. A proposed photoreaction mechanism was presented based on the key roles of the surface hydroxyl species and superoxide radicals such as O2- and ⋅OH, together with W6+/W5+ couples and e-/h+ pairs in the catalysts in the p-nitrophenol photodegradation. The one-pot sol-gel synthesis method was proven to be effective to obtain W-TiO2/SiO2 catalyst with large surface area and high photocatalytic activity, and it can be also used for the preparation of other heterogeneous catalysts. |
| format | Article |
| id | doaj-art-a8a1e6c8b6bd4ed59dcd0eec19d412cb |
| institution | Kabale University |
| issn | 1687-529X |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-a8a1e6c8b6bd4ed59dcd0eec19d412cb2025-02-03T01:10:39ZengWileyInternational Journal of Photoenergy1687-529X2019-01-01201910.1155/2019/57485865748586One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-NitrophenolUlises Arellano Sánchez0Lifang Chen1Jin An Wang2Luis Enrique Noreña3Maximiliano Asomoza4Silvia Solis5Xiaolong Zhou6Yueqin Song7Jing Liu8Departamento de QuímicaESIQIEESIQIEDepartamento de Ciencias BásicasDepartamento de QuímicaDepartamento de QuímicaInternational Joint Research Center of Green Energy and Chemical EngineeringInternational Joint Research Center of Green Energy and Chemical EngineeringInternational Joint Research Center of Green Energy and Chemical EngineeringDouble modifications of TiO2 by doping with WO3 and by dispersing on a SiO2 support were made by the one-pot sol-gel method. Doping with W shifts the TiO2 band gap energy from 3.2 eV to around 3.06 eV. The surface area of the supported W-TiO2/SiO2 material was significantly increased, by approximately 3 times, in comparison to the bare TiO2. The photocatalytic activities of the catalysts were evaluated in the degradation reaction of p-nitrophenol in aqueous solution and basic medium. After 240 min of photodegradation, more than approximately 99% p-nitrophenol could be mineralized with the most active W-TiO2/SiO2 catalyst. Under UV irradiation, p-nitrophenol was initially photodegraded into hydroquinone and benzosemiquinone intermediates, which were further degraded into smaller fragments such as organic carboxylic acids and finally completely mineralized. A proposed photoreaction mechanism was presented based on the key roles of the surface hydroxyl species and superoxide radicals such as O2- and ⋅OH, together with W6+/W5+ couples and e-/h+ pairs in the catalysts in the p-nitrophenol photodegradation. The one-pot sol-gel synthesis method was proven to be effective to obtain W-TiO2/SiO2 catalyst with large surface area and high photocatalytic activity, and it can be also used for the preparation of other heterogeneous catalysts.http://dx.doi.org/10.1155/2019/5748586 |
| spellingShingle | Ulises Arellano Sánchez Lifang Chen Jin An Wang Luis Enrique Noreña Maximiliano Asomoza Silvia Solis Xiaolong Zhou Yueqin Song Jing Liu One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol International Journal of Photoenergy |
| title | One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol |
| title_full | One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol |
| title_fullStr | One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol |
| title_full_unstemmed | One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol |
| title_short | One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol |
| title_sort | one pot synthesis of w tio2 sio2 catalysts for the photodegradation of p nitrophenol |
| url | http://dx.doi.org/10.1155/2019/5748586 |
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