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Effect of Ag content on the nanostructure and antimicrobial activity of CeO2

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Abstract

The morphological and antibacterial effects of CeO2 nanoparticles (NPs) with different amounts of Ag precursor were studied. The samples were synthesized with different percentages of silver nitrate content by co-precipitation method. The cerium nitrate hexahydrate was a precursor of Ce reagent, polyvinylpyrrolidone as dispersant agent, and ammonium hydroxide as a precipitating agent. The obtained particles were annealed at 400 °C and characterized by X-ray diffraction, scanning electron microscope (SEM), transmission electron microscopy (TEM), and N2 physisorption. The particles show high crystallinity, whose size decreases slightly by the effect of Ag precursor incorporation. These particle morphologies studied by SEM and TEM revealed the spherical shape of CeO2 NPs. Furthermore, the Ag particles were observed with a size of around 30 nm. Selected area electron diffraction patterns confirm the cubic structure of CeO2, also the cubic structure of Ag particles. Besides, it was determined that Ag incorporation has no significant influence on the textural properties of NPs. In addition, the antibacterial activity was evaluated against gram-negative and gram-positive microorganisms. The quantitative results showed that the antimicrobial activity increased depending on the Ag amount incorporated, reaching up to 99.999% of the growing reduction rate.

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Acknowledgements

The first author acknowledges to Consejo Nacional de Ciencia y Tecnología for the PhD her graduate fellowship with support number 803759. The authors thank Luis de la Torre Sáenz and Andrés Isaak González Jacquez for their technical help at Centro de Investigación en Materiales Avanzados. Thanks to Cindy Villalba from the Micology Lab at Universidad Autónoma de Chihuahua and Semiconductors Lab at Centro de Investigación de Ciencia y Tecnología Aplicada de Tabasco for their help in realizing the antibacterial and material synthesis facilities.

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Limny Esther Pérez Jiménez performed the experimental synthesis, data analysis, and the first draft. Francisco Paraguay Delgado, Erik Ramírez Morales, and Lizeth Rojas Blanco conducted the data curation, formal analysis, and general supervision. The general supervision of experiments and formal analysis of the antibacterial activity section were performed by Laila Nayzzel Muñoz Castellanos. Edicson Macedonio López Alejandro performed the general review and editing. All authors read and approved the final manuscript.

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Correspondence to Erik Ramírez Morales.

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Jiménez, L.E.P., Delgado, F.P., Castellanos, L.N.M. et al. Effect of Ag content on the nanostructure and antimicrobial activity of CeO2. Environ Sci Pollut Res 30, 57811–57820 (2023). https://doi.org/10.1007/s11356-023-26585-2

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  • DOI: https://doi.org/10.1007/s11356-023-26585-2

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