Abstract In this work, ZnO nanoparticles were surface-modified by thermal shock method with HAuCl4 and KF as precursors at different temperatures. The impacts of our modification process on the crystal structure, morphology, surface functional groups and surface composition of catalysts were characterized by XRD, TEM, FTIR and XPS spectra, respectively. Their photocatalytic activity was investigated through the degradation of methylene blue under UVA light and visible light irradiation. According to the results, our modification method successfully improved the photocatalytic activity of ZnO. Among all catalysts, the sample co-modified with Au and F at thermal shock temperature of 400oC showed the best performance which was three times greater than that of unmodified ZnO sample under both UVA light and visible light. The enhanced photocatalytic activity of our modified catalysts can be attributed to the synergic effect of HAuCl4 and KF precursors which are able to produce Au(0) nanoparticles, Au+ ions and zinc vacancies on the oxide surface.

中文翻译：

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Au和F共改性热冲击法对ZnO光催化活性的影响

摘要 在这项工作中，以 HAuCl4 和 KF 为前驱体，在不同温度下通过热冲击法对 ZnO 纳米颗粒进行了表面改性。我们的改性过程对催化剂的晶体结构、形貌、表面官能团和表面组成的影响分别通过 XRD、TEM、FTIR 和 XPS 光谱表征。通过在UVA光和可见光照射下降解亚甲蓝来研究它们的光催化活性。根据结果​​，我们的改性方法成功地提高了 ZnO 的光催化活性。在所有催化剂中，Au和F共改性的样品在400oC的热冲击温度下表现出最好的性能，在UVA光和可见光下均是未改性ZnO样品的三倍。