Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation
In this work, we synthesized Ag nanoparticles on TiO2 thin films deposited on soda lime glass substrates. Ag nanoparticles were synthesized by photoreduction under UV irradiation silver nitrate solution. X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectr...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2018/6080432 |
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| _version_ | 1832557107286638592 |
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| author | Carlos Díaz-Uribe Jose Viloria Lorraine Cervantes William Vallejo Karen Navarro Eduard Romero Cesar Quiñones |
| author_facet | Carlos Díaz-Uribe Jose Viloria Lorraine Cervantes William Vallejo Karen Navarro Eduard Romero Cesar Quiñones |
| author_sort | Carlos Díaz-Uribe |
| collection | DOAJ |
| description | In this work, we synthesized Ag nanoparticles on TiO2 thin films deposited on soda lime glass substrates. Ag nanoparticles were synthesized by photoreduction under UV irradiation silver nitrate solution. X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) measurements were used for physicochemical characterization. The structural study showed that all samples were polycrystalline, main phases were anatase and rutile, and no additional signals were detected after surface modification. Raman spectroscopy suggested that silver aggregates deposited on the TiO2 films could exhibit the surface plasmon resonance (SPR) phenomenon; XPS and SEM analysis confirmed TiO2 film morphological modification after photoreduction process. Photocatalytic degradation of methylene blue (MB) was studied under UV irradiation in aqueous solution, and, besides, pseudo-first-order model was used to obtain kinetic information about photocatalytic degradation. Results indicated that Ag-TiO2 showed an important increase in photocatalytic activity under UV (from 20% to 35%); finally, Ag-TiO2 thin films had kapp value 2.4 × 10−3 ± 0.003 min−1 of 1.8 times greater than the kapp value 1.3 × 10−4 ± 0.0004 min−1 of TiO2 thin films. |
| format | Article |
| id | doaj-art-7881d9c988874858a53a87b306053b92 |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-7881d9c988874858a53a87b306053b922025-02-03T05:43:42ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2018-01-01201810.1155/2018/60804326080432Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV IrradiationCarlos Díaz-Uribe0Jose Viloria1Lorraine Cervantes2William Vallejo3Karen Navarro4Eduard Romero5Cesar Quiñones6Grupo de Fotoquímica y Fotobiología, Universidad del Atlántico, Barranquilla, ColombiaGrupo de Fotoquímica y Fotobiología, Universidad del Atlántico, Barranquilla, ColombiaGrupo de Fotoquímica y Fotobiología, Universidad del Atlántico, Barranquilla, ColombiaGrupo de Fotoquímica y Fotobiología, Universidad del Atlántico, Barranquilla, ColombiaGrupo de Fotoquímica y Fotobiología, Universidad del Atlántico, Barranquilla, ColombiaDepartamento de Química, Universidad Nacional de Colombia, Bogotá, ColombiaInstitución Universitaria Politécnico Gran Colombiano, Bogotá, ColombiaIn this work, we synthesized Ag nanoparticles on TiO2 thin films deposited on soda lime glass substrates. Ag nanoparticles were synthesized by photoreduction under UV irradiation silver nitrate solution. X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) measurements were used for physicochemical characterization. The structural study showed that all samples were polycrystalline, main phases were anatase and rutile, and no additional signals were detected after surface modification. Raman spectroscopy suggested that silver aggregates deposited on the TiO2 films could exhibit the surface plasmon resonance (SPR) phenomenon; XPS and SEM analysis confirmed TiO2 film morphological modification after photoreduction process. Photocatalytic degradation of methylene blue (MB) was studied under UV irradiation in aqueous solution, and, besides, pseudo-first-order model was used to obtain kinetic information about photocatalytic degradation. Results indicated that Ag-TiO2 showed an important increase in photocatalytic activity under UV (from 20% to 35%); finally, Ag-TiO2 thin films had kapp value 2.4 × 10−3 ± 0.003 min−1 of 1.8 times greater than the kapp value 1.3 × 10−4 ± 0.0004 min−1 of TiO2 thin films.http://dx.doi.org/10.1155/2018/6080432 |
| spellingShingle | Carlos Díaz-Uribe Jose Viloria Lorraine Cervantes William Vallejo Karen Navarro Eduard Romero Cesar Quiñones Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation International Journal of Photoenergy |
| title | Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation |
| title_full | Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation |
| title_fullStr | Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation |
| title_full_unstemmed | Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation |
| title_short | Photocatalytic Activity of Ag-TiO2 Composites Deposited by Photoreduction under UV Irradiation |
| title_sort | photocatalytic activity of ag tio2 composites deposited by photoreduction under uv irradiation |
| url | http://dx.doi.org/10.1155/2018/6080432 |
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