Ag/Ag3PO4/g-C3N4三元复合光催化剂的制备及其可见光驱动下的光催化活性增强

报道了一种新型Ag/Ag₃PO₄/g-C₃N₄三元复合光催化剂的制备及其半导体界面处的快速载流子分离所引起的光催化活性的显著增强效应。通过X射线衍射，扫描电子显微镜，紫外-可见吸收光谱以及光致发光光谱等就其晶体结构、形貌、组分、光学吸收以及载流子的快速分离行为进行了表征与分析。以罗丹明B作为模型化合物分子，研究发现，所制备的Ag/Ag₃PO₄/g-C₃N₄三元复合光催化剂在可见光照射下表现出比Ag₃PO₄以及Ag₃PO₄/g-C₃N₄二元催化剂更为优异的光催化活性。研究认为，Ag₃PO₄表面尺寸约为40 nm的Ag纳米粒子在可见光下受激所产生的等离子表面共振效应以及Ag₃PO₄与g-C₃N₄界面处所形成的类似异质结结构对所制备的Ag/Ag₃PO₄/g-C₃N₄三元复合光催化剂光催化活性的显著增强起到重要作用。

Preparation of ternary Ag/Ag3PO4/g-C3N4 hybrid photocatalysts and their enhanced photocatalytic activity driven by visible light

The preparation of a series of ternary Ag/Ag₃PO₄/g-C₃N₄ hybrid photocatalysts, which display enhanced photocatalytic activity, was reported. The crystal structure, morphology, composition, optical absorption, and efficient separation of charge carriers were studied by X-ray diffraction, scanning electron microscopy, absorption and photoluminescence spectroscopy measurements. Using rhodamine B as a model contaminant, the as-prepared Ag/Ag₃PO₄/g-C₃N₄ hybrid photocatalyst exhibited superior degradation performance under visible light irradiation than Ag₃PO₄ or binary Ag₃PO₄/g-C₃N₄ hybrid photocatalyst systems. The surface plasmon resonance of the 40 nm-silver nanoparticles formed on the surface of Ag₃PO₄ and the heterojunction formed at the interface between Ag₃PO₄ and g-C₃N₄, are considered to be the major physical-chemical origin and to be responsible for the enhanced photocatalytic activity.