Photocatalytic activity of TiO2 synthesized by anodization and anodic spark deposition
| Autor: | Rafael Magaña-López, Alma C. Chávez-Mejía, Blanca Jiménez-Cisneros, Julio C. Morales-Mejía, Paloma I. Zaragoza-Sánchez, Génesis Villegas-Suárez |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope Anodizing Mechanical Engineering Sulfuric acid 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis Amorphous solid chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Titanium dioxide Photocatalysis General Materials Science Electric potential 0210 nano-technology |
| Zdroj: | MRS Advances. 5:3141-3152 |
| ISSN: | 2059-8521 |
| DOI: | 10.1557/adv.2020.405 |
| Popis: | Several photocatalysts, based on titanium dioxide, were synthesized by spark anodization techniques and anodic spark oxidation. Photocatalytic activity was determined by methylene blue oxidation and the catalytic activities of the catalysts were evaluated after 70 hours of reaction. Scanning Electron Microscopy and X Ray Diffraction analysis were used to characterize the catalysts. The photocatalyst prepared with a solution of sulfuric acid and 100 V presented the best performance in terms of oxidation of the dye (62%). The electric potential during the synthesis (10 V, low potential; 100 V, high potential) affected the surface characteristics: under low potential, catalyst presented smooth and homogeneous surfaces with spots (high TiO2 concentration) of amorphous solids; under low potential, catalyst presented porous surfaces with crystalline solids homogeneously distributed. |
| Databáze: | OpenAIRE |
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