A Z-scheme system Mn₃O₄/CeO₂ heterojunction was fabricated via a simple one-step hydrothermal method and further applied for photocatalytic Rhodamine B (RhB) degradation. In this work, the Mn₃O₄ nanoparticle was uniformly deposited on CeO₂ nanorod surface, which formed a typical heterojunction. The presence of Mn₃O₄ in the Mn₃O₄/CeO₂ heterojunction was confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). X-ray photoelectron spectroscopy (XPS) verified that Mn was in the form of Mn³⁺ and Mn²⁺ in Mn₃O₄ nanoparticle. Noticeably, the Mn₃O₄/CeO₂ heterojunction exhibited excellent photocatalytic activity for RhB degradation. The drastically enhanced photocatalytic performance could be attributed to improved light harvesting, efficient separation of the photo-generated electron–hole pairs and stronger electronic conductivity. Moreover, the photocatalytic mechanism was also explored on the Mn₃O₄/CeO₂ heterojunction. This novel Mn₃O₄/CeO₂ heterojunction was proved to have great potential for the degradation of organic contaminants in water.

中文翻译：

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Mn ₃ O ₄ / CeO ₂异质结增强的可见光光催化降解：Z方案体系光催化剂

通过简单的一步水热法制备了Z-方案体系的Mn ₃ O ₄ / CeO ₂异质结，并将其进一步应用于光催化罗丹明B（RhB）的降解。在这项工作中，Mn ₃ O ₄纳米颗粒均匀地沉积在CeO ₂纳米棒表面上，形成典型的异质结。通过X射线衍射（XRD）和透射电子显微镜（TEM）证实了Mn ₃ O ₄ / CeO ₂异质结中存在Mn ₃ O ₄。X射线光电子能谱（XPS）验证了Mn以Mn ³⁺的形式存在Mn ₃ O ₄纳米颗粒中的Mn ²⁺和Mn ²⁺。值得注意的是，Mn ₃ O ₄ / CeO ₂异质结对RhB的降解表现出优异的光催化活性。大大提高的光催化性能可以归因于光收集的改善，光生电子-空穴对的有效分离以及更强的电子传导性。此外，还探索了对Mn ₃ O ₄ / CeO ₂异质结的光催化机理。新型Mn ₃ O ₄ / CeO ₂ 异质结被证明具有降解水中有机污染物的巨大潜力。