Hydrogen production by tailoring the brookite and Cu2O ratio of sol-gel Cu-TiO2 photocatalysts
| Autor: | Mariana Hinojosa-Reyes, Roberto Camposeco-Solis, Rodolfo Zanella, Vicente Rodríguez González |
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| Rok vydání: | 2017 |
| Předmět: |
Anatase
Environmental Engineering Materials science Hydrogen Health Toxicology and Mutagenesis Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Environmental Chemistry Temperature-programmed reduction Hydrogen production Brookite Public Health Environmental and Occupational Health General Medicine General Chemistry 021001 nanoscience & nanotechnology Pollution Copper 0104 chemical sciences chemistry visual_art Photocatalysis visual_art.visual_art_medium Water splitting 0210 nano-technology |
| Zdroj: | Chemosphere. 184:992-1002 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2017.06.066 |
| Popis: | Cu-TiO 2 photocatalysts were prepared by the sol-gel method. Copper loadings from, 1.0 to 5.0 wt % were used. The materials were annealed at different temperatures (from 400 to 600 °C) to study the formation of brookite and copper ionic species. The photocatalysts were characterized by X-ray diffraction, UV–vis, Raman and XPS spectroscopies, H 2 -temperature programmed reduction (TPR), N 2 physisorption, and SEM–EDS to quantify the actual copper loadings and characterize morphology. The photocatalysts were evaluated during the hydrogen photocatalytic production using an ethanolic solution (50% v/v) under UV and visible radiation. The best hydrogen production was performed by Ti-Cu 1.0 with an overall hydrogen production that was five times higher than that obtained with photolysis. This sample had an optimal thermal treatment at 500 °C, and at this temperature, the Cu 2 O and brookite/anatase ratio boosted the photocatalytic production of hydrogen. In addition, a deactivation test was carried out for the most active sample (TiO 2 -Cu 1.0), showing unchanged H 2 production for three cycles with negligible Cu lixiviation. The activity of hydrogen-through-copper production reported in this research work is comparable with the one featured by noble metals and that reported in the literature for doped TiO 2 materials. |
| Databáze: | OpenAIRE |
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