Abstract 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 ~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.

中文翻译：

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用于靶向治疗和水修复的氧化物基纳米粒子的放射性催化性能

摘要 通过降解亚甲基蓝作为有机探针，研究了氧化锌（ZnO）、二氧化铪（HfO2）、二氧化钛（TiO2）和金-二氧化钛（Au@TiO2）纳米材料的放射性催化行为。来自终点能量为 6 MeV 的医用直线加速器的 X 射线对染料的降解在基于氧化物的纳米粒子的存在下得到增强，这证明了它们作为放射增敏剂的前景。在暴露于 X 射线期间，在基于氧化物的纳米粒子存在的情况下，观察到染料表观反应速率常数增加了 ~20% 和高达 82%。这种增强归因于溶液中活性物质的产生增加。金-二氧化钛纳米复合材料是所研究材料中放射性催化活性最高的材料之一，MB 表观反应速率常数增加了 50.3%。