In this study, C₃N₄@Ag-Bi₂WO₆ with flower-like architecture was successfully prepared through a facile process. The C₃N₄@Ag-Bi₂WO₆ particles with 2–4 μm diameters present remarkable enhanced visible light absorption and electron–hole separation efficiency. Compared with Bi₂WO₆, Ag-Bi₂WO₆, and C₃N₄@Bi₂WO₆ systems, the C₃N₄@Ag-Bi₂WO₆ system exhibits optimal photocatalytic activities in both the degradation of RhB and hydrogen production out of water under visible light irradiation. We propose that these results are attributed to the synergy effects of Ag, g-C₃N₄, and Bi₂WO₆ nanophase structures in the C₃N₄@Ag-Bi₂WO₆ composites, which results in a fast electron–hole separation and slow charge recombination by a Z-scheme mechanism and ultimately in a higher photocatalytic activity.

中文翻译：

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gC ₃ N ₄和Ag共修饰的Bi ₂ WO ₆微球在可见光下的光反应性和机理

在本研究中，通过简便的方法成功制备了具有花状结构的C ₃ N ₄ @ Ag-Bi ₂ WO ₆。直径为2–4μm的C ₃ N ₄ @ Ag-Bi ₂ WO ₆颗粒具有显着增强的可见光吸收和电子-空穴分离效率。与Bi ₂ WO ₆，Ag-Bi ₂ WO ₆和C ₃ N ₄ @Bi ₂ WO ₆体系相比，C ₃ N ₄ @ Ag-Bi ₂ WO ₆在可见光照射下，该系统在RhB降解和水中制氢方面均表现出最佳的光催化活性。我们认为，这些结果归因于C ₃ N ₄ @ Ag-Bi ₂ WO ₆复合材料中Ag，gC ₃ N ₄和Bi ₂ WO ₆纳米相结构的协同效应，从而实现了快速的电子-空穴分离并通过Z方案机制缓慢地进行电荷重组，最终实现更高的光催化活性。