Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics
Long-lasting Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> phosphor beads were prepared with inorganic sodium silicate binders and coated to support Ag-doped TiO<sub>2</sub> catalyst by the sol–gel...
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MDPI AG
2021-02-01
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| Online Access: | https://www.mdpi.com/2073-4344/11/2/261 |
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| author | Seong-Rak Eun Shielah Mavengere Jung-Sik Kim |
| author_facet | Seong-Rak Eun Shielah Mavengere Jung-Sik Kim |
| author_sort | Seong-Rak Eun |
| collection | DOAJ |
| description | Long-lasting Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> phosphor beads were prepared with inorganic sodium silicate binders and coated to support Ag-doped TiO<sub>2</sub> catalyst by the sol–gel coating method. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy confirmed that Ag and TiO<sub>2</sub> were loaded on the bead surface. Photocatalytic degradation of toluene volatile organic compound was evaluated under ultraviolet and visible light through 410 nm filters. The photocatalyst/phosphor beads of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> decorated with 0.035 M Ag in N<sub>2</sub> and N<sub>2</sub>-H<sub>2</sub> atmospheres exhibited higher photocatalytic efficiencies compared with beads heat treated in air. A low amount of Ag impregnation and the reducing atmosphere of N<sub>2</sub>/N<sub>2</sub>-H<sub>2</sub> were beneficial for enhancing photocatalytic efficiency because Ag-doping in TiO<sub>2</sub> imparted low energy levels for visible light sensitization. The synthesized powder-free beads possess compressive strength for possible applications, and easy recovery of the photocatalysts is beneficial for preventing any secondary pollution of nano-powders. |
| first_indexed | 2024-03-09T00:51:42Z |
| format | Article |
| id | doaj.art-9c572a834eae46ec8af654cd4516e75f |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T00:51:42Z |
| publishDate | 2021-02-01 |
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| series | Catalysts |
| spelling | doaj.art-9c572a834eae46ec8af654cd4516e75f2023-12-11T17:10:04ZengMDPI AGCatalysts2073-43442021-02-0111226110.3390/catal11020261Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction CharacteristicsSeong-Rak Eun0Shielah Mavengere1Jung-Sik Kim2Department of Materials Science and Engineering, University of Seoul, Seoul 02504, KoreaDepartment of Materials Science and Engineering, University of Seoul, Seoul 02504, KoreaDepartment of Materials Science and Engineering, University of Seoul, Seoul 02504, KoreaLong-lasting Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> phosphor beads were prepared with inorganic sodium silicate binders and coated to support Ag-doped TiO<sub>2</sub> catalyst by the sol–gel coating method. Energy dispersive spectroscopy and X-ray photoelectron spectroscopy confirmed that Ag and TiO<sub>2</sub> were loaded on the bead surface. Photocatalytic degradation of toluene volatile organic compound was evaluated under ultraviolet and visible light through 410 nm filters. The photocatalyst/phosphor beads of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> decorated with 0.035 M Ag in N<sub>2</sub> and N<sub>2</sub>-H<sub>2</sub> atmospheres exhibited higher photocatalytic efficiencies compared with beads heat treated in air. A low amount of Ag impregnation and the reducing atmosphere of N<sub>2</sub>/N<sub>2</sub>-H<sub>2</sub> were beneficial for enhancing photocatalytic efficiency because Ag-doping in TiO<sub>2</sub> imparted low energy levels for visible light sensitization. The synthesized powder-free beads possess compressive strength for possible applications, and easy recovery of the photocatalysts is beneficial for preventing any secondary pollution of nano-powders.https://www.mdpi.com/2073-4344/11/2/261Ag-TiO<sub>2</sub> photocatalystSr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup>phosphor beadstoluene VOC |
| spellingShingle | Seong-Rak Eun Shielah Mavengere Jung-Sik Kim Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics Catalysts Ag-TiO<sub>2</sub> photocatalyst Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> phosphor beads toluene VOC |
| title | Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics |
| title_full | Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics |
| title_fullStr | Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics |
| title_full_unstemmed | Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics |
| title_short | Preparation of Ag-TiO<sub>2</sub>/Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> Photocatalyst on Phosphor Beads and Its Photoreaction Characteristics |
| title_sort | preparation of ag tio sub 2 sub sr sub 4 sub al sub 14 sub o sub 25 sub eu sup 2 sup dy sup 3 sup photocatalyst on phosphor beads and its photoreaction characteristics |
| topic | Ag-TiO<sub>2</sub> photocatalyst Sr<sub>4</sub>Al<sub>14</sub>O<sub>25</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup> phosphor beads toluene VOC |
| url | https://www.mdpi.com/2073-4344/11/2/261 |
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