Antibacterial performance of Co–Zn ferritenanoparticles under visible light irradiation
BACKGROUND: To address water scarcity and promote sustainable resource management, more efficient and cost-effectivewater treatment solutions are necessary. Particularly, pathogens in drinking water are a topic of growing concern. One prom-ising technology is the use of photocatalytic nanoparticles a...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/71502 |
| Acceso en línea: | http://hdl.handle.net/10810/71502 |
| Access Level: | acceso abierto |
| Palabra clave: | Co–Zn ferrites photocatalytic nanoparticles antibacterial nanoparticles |
| Sumario: | BACKGROUND: To address water scarcity and promote sustainable resource management, more efficient and cost-effectivewater treatment solutions are necessary. Particularly, pathogens in drinking water are a topic of growing concern. One prom-ising technology is the use of photocatalytic nanoparticles activated by visible light as antibacterial agents. This study focuseson the characterization and antibacterial properties of Co–Zn ferrite nanocatalysts, tested against Escherichia coli.RESULTS: The CoxZn1−xFe2 O4 (x = 0, 0.1, 0.4 and 0.6) ferrites were synthesized by the co-precipitation method. Structural, mor-phological and optical analyses confirmed that these nanoparticles have a cubic spinel structure, with sizes of around 10 nm,and band gap energies suitable for visible light activation (1.4–1.7 eV). The antibacterial efficacy of the nanoparticles againstE. coli was tested and compared with their photocatalytic performance employing phenol as organic pollutant model (highestphenol degradation for x = 0.6). Specifically, the antibacterial capacity of these nanoparticles was evaluated by comparing theability of bacteria to grow after being incubated with the nanoparticles under visible light and in the dark. It was found thatnanoparticles with lower cobalt content (x = 0 and 0.1) significantly reduced bacterial culturability under visible light. Trans-mission Electron Microscopy analysis revealed that nanoparticles with cobalt content caused bacteria to secrete biofilm, poten-tially offering some protection against the nanoparticles.CONCLUSION: ZnFe 2 O4 nanoparticles show the highest antibacterial effect amongst those tested. This is attributed to the com-bined action of Zn 2+ ion release and the photocatalytic effect under visible light. Furthermore, Zn might inhibit protective bio-film secretion, leading to higher antibacterial effects.© 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Soci-ety of Chemical Industry (SCI). |
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