Visible-Light Active Sulfur-Doped Titania Nanoparticles Immobilized on a Silica Matrix: Synthesis, Characterization and Photocatalytic Degradation of Pollutants
| Autor: | Ioanna Deligkiozi, Alexandros Zoikis Karathanasis, Alexios Grigoropoulos, Sofia P. Makri, Theodora Kalampaliki, Evanthia Papadaki |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
TiO2 nanoparticles
Materials science Diffuse reflectance infrared fourier transform Scanning electron microscope General Chemical Engineering safe by design Nanoparticle Infrared spectroscopy NOx oxidation 02 engineering and technology 010402 general chemistry 01 natural sciences Article chemistry.chemical_compound Dynamic light scattering SiO2 Methyl orange General Materials Science QD1-999 S-doping MO degradation 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry chemistry 13. Climate action Photocatalysis 0210 nano-technology photocatalysis Nuclear chemistry Visible spectrum |
| Zdroj: | NANOMATERIALS Nanomaterials Volume 11 Issue 10 Nanomaterials, Vol 11, Iss 2543, p 2543 (2021) |
| Popis: | The photocatalytic oxidation (PCO) of pollutants using TiO2-based materials can significantly improve indoor air quality (IAQ), which in turn, has a significant impact on human health and life expectancy. TiO2-based nanoparticles (NPs) are widely used as part of building materials to function as photocatalysts in PCO. In this work, a series of sulfur-doped TiO2 NPs immobilized on a silica matrix were synthesized by combining a sol-gel process with ball milling. The samples were structurally characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), Fourier-transform infrared spectroscopy (FT-IR) and N2 adsorption-desorption isotherms. Furthermore, the morphological characteristics were determined by dynamic light scattering (DLS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The photocatalytic activity of the as prepared S-doped TiO2/SiO2 NPs in the degradation of liquid and air pollutants under visible-light irradiation was investigated. Our results show that sulfur is an effective dopant for activating TiO2/SiO2 photocatalysts under visible-light irradiation. Silica constitutes a “safe-by-design” approach and inhibits the aggregation of NPs during synthesis. The most efficient photocatalyst afforded 79% removal of methyl orange (5 h), 26% removal of acetaldehyde (1 h) and 12% oxidation of NO (1 h). |
| Databáze: | OpenAIRE |
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