Antioxidant Activity of Ablated Cerium Dioxide Nanoparticles in an Oxidative Photocatalytic Reaction

Abstract

Purpose of the study. Study and comparison of the antioxidant properties of ablated cerium dioxide nanoparticles in the oxidative photocatalytic degradation of methylene blue ablated from imported and laboratory targets.Methods. By pressing cerium dioxide powder and annealing the pressed target, laboratory targets were obtained, which were subjected to the laser ablation process. Atomic force microscopy was used to characterize cerium dioxide nanoparticles. The spectrophotometric method was used to study the antioxidant properties of cerium dioxide nanoparticles. The antioxidant activity of ablated nanoparticles obtained from two targets in an oxidative photocatalytic reaction has been studied and compared. Cerium dioxide nanoparticles with high antioxidant activity were obtained by laser ablation.Results. Using atomic force microscopy, the average limiting sizes of non-centrifuged and centrifuged samples at a speed of 1000 rpm of ablated cerium dioxide nanoparticles were established. It was found that the elemental composition of the cerium dioxide powder, from which the laboratory target was pressed, and the elemental composition of the imported target are the same, and the percentage of impurities in them is within the limits acceptable for the laser ablation process. The antioxidant activity of cerium dioxide nanoparticles ablated from laboratory and imported targets was compared. The data obtained in the course of the study indicate that cerium dioxide nanoparticles obtained from a laboratory target exhibit the highest antioxidant activity.Conclusion. Cerium dioxide nanoparticles subjected to laser ablation from a laboratory target are nanomaterials that are antioxidants that inactivate reactive oxygen species in a photocatalytic reaction. The antioxidant activity of cerium dioxide nanoparticles obtained from a laboratory target is not lower, but higher than that of nanoparticles obtained from an imported target. These properties of cerium dioxide nanoparticles are due to the presence of crystalline defects such as oxygen vacancies on their surface.