Abstract
This work reports abnormal dynamics of hydroxyl radicals generation under UV irradiation of water solution containing small (d = 2 nm) GdYVO4:Eu3+ nanoparticles (NPs). An analysis of the increase in OH concentration in time allows two parts in the OH generation curve to be revealed. The first slower part is shown to be associated with a predominate radical scavenging mechanism and explained by the presence of ions with a changeable valence state (V4+/V5+) and oxygen vacancies in the structure of GdYVO4:Eu3+ NPs. The second faster part is associated with photo-induced holes interaction with water molecules adsorbed at the surface of NPs followed by the hydroxyl radical production. The mutual contributions of the two mechanisms are changed in time and the depletion of the scavenging mechanism is observed in about 90 min after UV irradiation start. Our finding is a next step to understand the mechanism of NPs redox-activity for taking greater advantage of such nanomaterials in biomedical applications.
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