Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of Diclofenac
We report on the photodegradation of diclofenac (DCF) by hydrothermal anatase nanocrystals either free or immobilized in porous silica matrix (TS) in connection to the type and amount of reactive oxygen species (ROS), in order to have deeper insight into their role in the photocatalysis and to provi...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2015/919217 |
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| author | B. Di Credico I. R. Bellobono M. D’Arienzo D. Fumagalli M. Redaelli R. Scotti F. Morazzoni |
| author_facet | B. Di Credico I. R. Bellobono M. D’Arienzo D. Fumagalli M. Redaelli R. Scotti F. Morazzoni |
| author_sort | B. Di Credico |
| collection | DOAJ |
| description | We report on the photodegradation of diclofenac (DCF) by hydrothermal anatase nanocrystals either free or immobilized in porous silica matrix (TS) in connection to the type and amount of reactive oxygen species (ROS), in order to have deeper insight into their role in the photocatalysis and to provide an effective tool to implement the DCF mineralization. TiO2 and TS exhibit a remarkable efficiency in the DCF abatement, supporting that the utilization of anatase nanoparticles with the highly reactive {001}, {010}, and {101} exposed surfaces can be an effective way for enhancing the photooxidation even of the persistent pollutants. Furthermore, the hydrothermal TiO2, when immobilized in silica matrix, preserves its functional properties, combining high photoactivity with an easy technical use and recovery of the catalyst. The catalysts performances have been related to the presence of OH•, O21, and O2-• species by electron paramagnetic resonance spin-trap technique. The results demonstrated that the ROS concentration increases with the increase of photoactivity and indicated a significant involvement of O21 in the DCF degradation. The efficacy of TiO2 when immobilized on a silica matrix was associated with the high ROS life time and with the presence of singlet oxygen, which contributes to the complete photomineralization of DCF. |
| format | Article |
| id | doaj-art-82ba968ba5af445aadf0ee85afc1908d |
| institution | OA Journals |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-82ba968ba5af445aadf0ee85afc1908d2025-08-20T02:08:46ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2015-01-01201510.1155/2015/919217919217Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of DiclofenacB. Di Credico0I. R. Bellobono1M. D’Arienzo2D. Fumagalli3M. Redaelli4R. Scotti5F. Morazzoni6Department of Material Science, INSTM, HINT-COST Project, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, ItalyLASA, Department of Physics, University of Milan, Via Fratelli Cervi, 20090 Segrate, ItalyDepartment of Material Science, INSTM, HINT-COST Project, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, ItalyDepartment of Material Science, INSTM, HINT-COST Project, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, ItalyDepartment of Material Science, INSTM, HINT-COST Project, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, ItalyDepartment of Material Science, INSTM, HINT-COST Project, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, ItalyDepartment of Material Science, INSTM, HINT-COST Project, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, ItalyWe report on the photodegradation of diclofenac (DCF) by hydrothermal anatase nanocrystals either free or immobilized in porous silica matrix (TS) in connection to the type and amount of reactive oxygen species (ROS), in order to have deeper insight into their role in the photocatalysis and to provide an effective tool to implement the DCF mineralization. TiO2 and TS exhibit a remarkable efficiency in the DCF abatement, supporting that the utilization of anatase nanoparticles with the highly reactive {001}, {010}, and {101} exposed surfaces can be an effective way for enhancing the photooxidation even of the persistent pollutants. Furthermore, the hydrothermal TiO2, when immobilized in silica matrix, preserves its functional properties, combining high photoactivity with an easy technical use and recovery of the catalyst. The catalysts performances have been related to the presence of OH•, O21, and O2-• species by electron paramagnetic resonance spin-trap technique. The results demonstrated that the ROS concentration increases with the increase of photoactivity and indicated a significant involvement of O21 in the DCF degradation. The efficacy of TiO2 when immobilized on a silica matrix was associated with the high ROS life time and with the presence of singlet oxygen, which contributes to the complete photomineralization of DCF.http://dx.doi.org/10.1155/2015/919217 |
| spellingShingle | B. Di Credico I. R. Bellobono M. D’Arienzo D. Fumagalli M. Redaelli R. Scotti F. Morazzoni Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of Diclofenac International Journal of Photoenergy |
| title | Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of Diclofenac |
| title_full | Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of Diclofenac |
| title_fullStr | Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of Diclofenac |
| title_full_unstemmed | Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of Diclofenac |
| title_short | Efficacy of the Reactive Oxygen Species Generated by Immobilized TiO2 in the Photocatalytic Degradation of Diclofenac |
| title_sort | efficacy of the reactive oxygen species generated by immobilized tio2 in the photocatalytic degradation of diclofenac |
| url | http://dx.doi.org/10.1155/2015/919217 |
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