The preferred exposure of (040) crystal facet of BiVO₄ is conductive to optimizing its photocatalytic performance. And the great separation of photoinduced electron-hole pairs is also a critical factor for semiconductor photocatalyst. Herein we designed a hierarchical g-C₃N₄@Ag/BiVO₄ (040) hybrid photocatalyst, in which Ag was photodeposited on the (040) facets of BiVO₄ and subsequently g-C₃N₄ was covered on the surface of Ag/BiVO₄ (040). The physical and chemical properties of the synthetic samples were analyzed by several characterization techniques. SEM spectrum clearly reveals the morphology and structure of g-C₃N₄@Ag/BiVO₄ (040), suggesting the existence of the hierarchical composite photocatalyst. The visible light absorption wavelength of the composite is increased due to the surface plasmon resonance (SPR) effect of metal Ag nanoparticles, displayed in UV–vis spectrum. The photogenerated electron-hole pairs are also greatly enhanced through the Z-scheme g-C₃N₄@Ag/BiVO₄ (040) system with the Ag nanoparticles as the electron mediator. The above synergistic effects of the hybrid photocatalyst result in higher photocatalytic oxidation performance not only for water splitting but also for NO oxidation in gas phase compared with pure BiVO₄.

中文翻译：

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具有增强的可见光诱导的光催化氧化性能的gC ₃ N ₄ @ Ag / BiVO ₄（040）的分层Z方案光催化剂

BiVO ₄的（040）晶面的优选曝光有助于优化其光催化性能。而且，光致电子-空穴对的巨大分离也是半导体光催化剂的关键因素。本文中，我们设计了一种分层的gC ₃ N ₄ @ Ag / BiVO ₄（040）杂化光催化剂，其中Ag被光沉积在BiVO ₄的（040）面上，随后gC ₃ N ₄被覆盖在Ag / BiVO ₄的表面上。（040）。通过几种表征技术分析了合成样品的物理和化学性质。SEM光谱清楚地显示了gC ₃的形态和结构N ₄ @ Ag / BiVO ₄（040），表明存在分层复合光催化剂。复合材料的可见光吸收波长由于在紫外可见光谱中显示的金属Ag纳米颗粒的表面等离振子共振（SPR）效应而增加。通过以Ag纳米粒子为电子介体的Z-方案gC ₃ N ₄ @ Ag / BiVO ₄（040）系统，也大大增强了光生电子-空穴对。与纯BiVO ₄相比，杂化光催化剂的上述协同作用不仅对水分解，而且对气相NO氧化都有更高的光催化氧化性能。