Photocatalytic Activity of Silver-Based Biomimetics Composites
| Autor: | Edgard Resto, Francisco Márquez, Florian Ion Petrescu, Carlos A. Valentín-Cruz, Abniel Machín, Carmen Morant, Kenneth Fontánez, Loraine Soto-Vázquez, Carla Colón-Cruz, Gerardo J. Claudio-Serrano |
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| Přispěvatelé: | UAM.Departamento de Física Aplicada, Instituto Universitario de Ciencia de Materiales Nicolás Cabrera (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
silver nanoparticles
Hydrogen hydrogen production Biomedical Engineering chemistry.chemical_element Hydrogen Production Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry lcsh:Technology Article Silver nanoparticle Catalysis Biomaterials X-ray photoelectron spectroscopy Ciprofloxacin ciprofloxacin Zno Photocatalysis Composite material Hydrogen production Chemistry lcsh:T Química 021001 nanoscience & nanotechnology 0104 chemical sciences ZnO Molecular Medicine Water splitting Degradation (geology) Tio2 Silver Nanoparticles 0210 nano-technology photocatalysis TiO2 Biotechnology |
| Zdroj: | Biomimetics, Vol 6, Iss 4, p 4 (2021) Biblos-e Archivo. Repositorio Institucional de la UAM instname Biomimetics Volume 6 Issue 1 |
| ISSN: | 2313-7673 |
| Popis: | Different Ag@TiO2 and Ag@ZnO catalysts, with nanowire (NW) structure, were synthesized containing different amounts of silver loading (1, 3, 5, and 10 wt.%) and characterized by FE-SEM, HRTEM, BET, XRD, Raman, XPS, and UV&ndash vis. The photocatalytic activity of the composites was studied by the production of hydrogen via water splitting under UV&ndash vis light and the degradation of the antibiotic ciprofloxacin. The maximum hydrogen production of all the silver-based catalysts was obtained with a silver loading of 10 wt.% under irradiation at 500 nm. Moreover, 10%Ag@TiO2 NWs was the catalyst with the highest activity in the hydrogen production reaction (1119 µ mol/hg), being 18 times greater than the amount obtained with the pristine TiO2 NW catalyst. The most dramatic difference in hydrogen production was obtained with 10%Ag@TiO2-P25, 635 µ mol/hg, being 36 times greater than the amount reported for the unmodified TiO2-P25 (18 µ mol/hg). The enhancement of the catalytic activity is attributed to a synergism between the silver nanoparticles incorporated and the high surface area of the composites. In the case of the degradation of ciprofloxacin, all the silver-based catalysts degraded more than 70% of the antibiotic in 60 min. The catalyst that exhibited the best result was 3%Ag@ZnO commercial, with 99.72% of degradation. The control experiments and stability tests showed that photocatalysis was the route of degradation and the selected silver-based catalysts were stable after seven cycles, with less than 1% loss of efficiency per cycle. These results suggest that the catalysts could be employed in additional cycles without the need to be resynthesized, thus reducing remediation costs. |
| Databáze: | OpenAIRE |
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