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Effect of the particle size and pH on the photocatalytic performance of cerium oxide (CeO2) nanoparticles

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Abstract

Cerium oxide nanoparticles (CeO2 NPs) have shown a potential capacity to destroy organic dyes because of their ability to generate reactive oxygen species (ROS) in aqueous phase. The photodegradation process can be influenced by the superficial area of the nanoparticle and the pH of the solution. This work studied the photocatalytic performance of CeO2 NPs at two sizes, and medium acid and basic. UV–Vis results showed shoulder peaks at 285 nm and 300 nm for small size (< 5.0 nm) and big size Nps (< 25.0 nm), respectively. Preliminary studies have reported that CeO2 NPs (size < 5 nm) generate ROS, which was evidenced for their toxicity in 100% to marine crustaceans after 24 and 48 h of exposure. We optimized the photocatalytic capacity of CeO2 Nps (< 25.0 nm) by modifying it to a basic pH, which resulted in a more significant degradation percent (40%) of Tropaeolin O.

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Acknowledgments

This work was supported by Institutional funds of Dr. Sonia J. Bailón-Ruiz of UPRP. The present research was carried out in the Laboratory of Investigation in Nanotechnology and Characterization (LINC). Thanks to Puerto Rico Louis Stokes Alliance for Minority Participation (PR-LSAMP). A part of this research was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No.DMR-1644779* and the State of Florida.

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Authors and Affiliations

  1. Department of Biology, University of Puerto Rico at Ponce, Ponce, PR, 00716, USA

    Natalie M. Lopés-Velasco

  2. Department of Chemistry and Physics, University of Puerto Rico at Ponce, Ponce, PR, 00716, USA

    Sonia J. Bailón-Ruiz

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  1. Natalie M. Lopés-Velasco
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  2. Sonia J. Bailón-Ruiz
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Correspondence to Sonia J. Bailón-Ruiz.

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Lopés-Velasco, N.M., Bailón-Ruiz, S.J. Effect of the particle size and pH on the photocatalytic performance of cerium oxide (CeO2) nanoparticles. MRS Advances 6, 769–773 (2021). https://doi.org/10.1557/s43580-021-00070-9

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