Abstract In this paper, Ag/AgVO3/BiVO4 heterojunctions were successfully prepared via a facile two-step method. The formation of Ag/AgVO3/BiVO4 heterojunctions can be confirmed by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The separation properties of photogenerated carriers were studied by surface photovoltage spectroscopy (SPS) and electrochemical technology. The results show that the separation rate of photoinduced carriers of Ag/AgVO3/BiVO4 heterojunctions can be dramatically promoted. The photocatalytic activity of the sample was evaluated by abatement of rhodamine B (RhB) under visible light irradiation. The results display that the photocatalytic activity of Ag/AgVO3/BiVO4 heterojunctions exhibit improved photocatalytic performance for the RhB degradation. Trapping measurements confirm that holes and O2− play a significant role in degradation of RhB, which can be attributed to the existence of Ag0 in the samples. Based on all the characterization results, a Z-scheme mechanism of photogenerated charge separation and transfer was proposed. Moreover, the enhancement in photocatalytic performance of Ag/AgVO3/BiVO4 heterojunctions is related to the separation and transfer of photogenerated carriers.

中文翻译：

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新型Ag/AgVO3/BiVO4异质结的制备具有显着增强的可见光驱动光催化性能源自光生电荷对的Z-scheme分离

摘要 本文采用简便的两步法成功制备了Ag/AgVO3/BiVO4异质结。Ag/AgVO3/BiVO4 异质结的形成可以通过 X 射线衍射 (XRD)、高分辨率透射电子显微镜 (HRTEM) 和 X 射线光电子能谱 (XPS) 证实。采用表面光电压谱(SPS)和电化学技术研究了光生载流子的分离特性。结果表明，Ag/AgVO3/BiVO4异质结的光生载流子分离率得到显着提高。通过在可见光照射下减少罗丹明 B (RhB) 来评估样品的光催化活性。结果表明，Ag/AgVO3/BiVO4异质结的光催化活性对RhB降解表现出改善的光催化性能。捕获测量证实空穴和 O2− 在 RhB 的降解中起重要作用，这可归因于样品中 Ag0 的存在。基于所有表征结果，提出了光生电荷分离和转移的Z-scheme机制。此外，Ag/AgVO3/BiVO4异质结光催化性能的增强与光生载流子的分离和转移有关。