Influence of the Size Factor on the Structure and Physical and Chemical Properties of Titanium Dioxide Nanoparticles

Purpose of the study. Investigation of the antioxidant properties of ablated cerium dioxide nanoparticles under conditions of oxidative degradation of the organic dye methylene blue during the Fenton reaction, depending on their size and structural-phase characteristics.

Methods. Characterization of ablated cerium dioxide nanoparticles using transmission electron microscopy equipped with an energy Ω-filter and a scanning HAADF detector; examination in the visible and ultraviolet range of the absorption spectra of samples using an optical spectrophotometer; study of the antioxidant activity of ablated nanoparticles in the Fenton oxidative reaction using the example of the organic dye methylene blue depending on the content and size composition of cerium dioxide nanoparticles.

Results. Cerium dioxide nanoparticles with pronounced antioxidant properties have been obtained by laser ablation. With an increase in the content of CeO₂ nanoparticles, the antioxidant properties of a colloidal solution based on them increase. The dependences of the antioxidant activity of cerium dioxide nanoparticles on their dimensional and structural characteristics have been determined.

Conclusion. A new method for obtaining nanodispersed particles of cerium oxide enriched with functional structural defects is proposed. Cerium dioxide nanoparticles, ablated by pulsed laser radiation, are new nanomaterials that are antioxidants capable of inactivating reactive oxygen species in oxidative processes such as the Fenton reaction.

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