Journal
RADIATION PHYSICS AND CHEMISTRY
Volume 173, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2020.108871
Keywords
Radiocatalysis; X-rays; Methylene blue; Supported gold nanoparticles; Metal oxide nanoparticles
Funding
- Department of Mechanical and Nuclear Engineering from Virginia Commonwealth University (VCU)
- VCU Presidential Research Quest Fund (PeRQ)
- Nuclear Regulatory Commission under Faculty Development Program in Radiation Defection and Health Physics [HQ-84-14-G-0051]
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The radiocatalytic behavior of zinc oxide (ZnO), hafnia (HfO2), titania (TiO2), and gold-titania (Au@TiO2) nanomaterials was investigated through the degradation of methylene blue as the organic probe. The dye degradation by X-rays from a medical linear accelerator with endpoint energy of 6 MeV was enhanced in the presence of the oxide-based nanoparticles evidencing their promise as radiosensitizers. An increase in the dye apparent reaction rate constants of similar to 20% and up to 82% was observed in the presence of oxides-based nanoparticles during exposure to X-rays. This enhancement is attributed to the increased production of reactive species in solution. Gold-titania nanocomposites evidenced one of the highest radiocatalytic activity among the materials under investigation, with an increase in the MB apparent reaction rate constant of 50.3%. Overall, our experiments showed that radiocatalysis with oxides-based nanoparticles is a promising concept worth exploring in applications such as targeted radiation therapy and pollutant removal of water streams.
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