Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic Acid
The stability of Ag-TiO2 photocatalysts was examined for the photocatalytic degradation of dichloroacetic acid (DCA) as a function of the recycling times. The photocatalytic activity was investigated by measuring the rate of H+ ions released during the photodegradation of DCA and confirmed by measur...
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| Format: | Article |
| Language: | English |
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Wiley
2008-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2008/280513 |
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| author | Víctor M. Menéndez-Flores Donia Friedmann Detlef W. Bahnemann |
| author_facet | Víctor M. Menéndez-Flores Donia Friedmann Detlef W. Bahnemann |
| author_sort | Víctor M. Menéndez-Flores |
| collection | DOAJ |
| description | The stability of Ag-TiO2 photocatalysts was examined for the photocatalytic degradation of dichloroacetic acid (DCA) as a function of the recycling times. The photocatalytic activity was investigated by measuring the rate of H+ ions released during the photodegradation of DCA and confirmed by measuring the total organic carbon removal. The photodegradation reactions were studied at pH 3 and pH 10 for a series of Ag-TiO2 photocatalysts as different with Ag loadings . All the Ag-TiO2 and bare TiO2 photocatalysts showed a decrease in photocatalytic activity on recycling for the DCA photodegradation reaction. The decrease in activity can be attributed to poisoning of active sites by Cl− anions formed during the photocatalytic DCA degradation. The photocatalytic activity was, however, easily recovered by a simple washing technique. The reversibility of the poisoning is taken as evidence to support the idea that the recycling of Ag-P25 TiO2 photocatalysts does not have a permanent negative effect on their photocatalytic performance for the degradation of DCA. The choice of the preparation procedure for the Ag-TiO2 photocatalysts is shown to be of significant importance for the observed changes in the photocatalytic activity of the Ag-TiO2 particles. |
| format | Article |
| id | doaj-art-e31523c55fdc4167a3d0c265b8a79416 |
| institution | OA Journals |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2008-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-e31523c55fdc4167a3d0c265b8a794162025-08-20T02:21:24ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2008-01-01200810.1155/2008/280513280513Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic AcidVíctor M. Menéndez-Flores0Donia Friedmann1Detlef W. Bahnemann2Institut für Technische Chemie, Leibniz Universität Hannover, Callinstraße 3, D-30167 Hannover, GermanyInterdisciplinary Nanoscience Center, University of Aarhus, Building 520, 8000 Aarhus C, DenmarkInstitut für Technische Chemie, Leibniz Universität Hannover, Callinstraße 3, D-30167 Hannover, GermanyThe stability of Ag-TiO2 photocatalysts was examined for the photocatalytic degradation of dichloroacetic acid (DCA) as a function of the recycling times. The photocatalytic activity was investigated by measuring the rate of H+ ions released during the photodegradation of DCA and confirmed by measuring the total organic carbon removal. The photodegradation reactions were studied at pH 3 and pH 10 for a series of Ag-TiO2 photocatalysts as different with Ag loadings . All the Ag-TiO2 and bare TiO2 photocatalysts showed a decrease in photocatalytic activity on recycling for the DCA photodegradation reaction. The decrease in activity can be attributed to poisoning of active sites by Cl− anions formed during the photocatalytic DCA degradation. The photocatalytic activity was, however, easily recovered by a simple washing technique. The reversibility of the poisoning is taken as evidence to support the idea that the recycling of Ag-P25 TiO2 photocatalysts does not have a permanent negative effect on their photocatalytic performance for the degradation of DCA. The choice of the preparation procedure for the Ag-TiO2 photocatalysts is shown to be of significant importance for the observed changes in the photocatalytic activity of the Ag-TiO2 particles.http://dx.doi.org/10.1155/2008/280513 |
| spellingShingle | Víctor M. Menéndez-Flores Donia Friedmann Detlef W. Bahnemann Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic Acid International Journal of Photoenergy |
| title | Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic Acid |
| title_full | Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic Acid |
| title_fullStr | Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic Acid |
| title_full_unstemmed | Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic Acid |
| title_short | Durability of Ag-TiO2 Photocatalysts Assessed for the Degradation of Dichloroacetic Acid |
| title_sort | durability of ag tio2 photocatalysts assessed for the degradation of dichloroacetic acid |
| url | http://dx.doi.org/10.1155/2008/280513 |
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