【摘要】 采用简单的化学沉积-沉淀法在室温下合成了一系列Ag/Ag₂WO₄/g-C₃N₄（AAC）三元复合光催剂,采用XRD、FT-IR、SEM、Raman、EDS、XPS、TEM对产物的物相、结构、形貌和光学性质进行了详细的表征。在可见光下,与Ag/Ag₂WO₄和g-C₃N₄相比,AAC-3的光催化活性明显增强,其光催化降解四环素的反应效率最高,速率常数为0.057 1 min^-1。在AAC-3体系中加入H₂O₂,反应速率明显加快,速率常数达到0.148 8 min^-1,是AAC-3体系的2.53倍。光催化性能的增强可以归因于:复合物改善了催化剂的吸光性能,增大了比表面积,促进了光生电子-空穴对的分离,加入H₂O₂使得反应体系能够提供更多的活性物种。提出了可能的光催化降解四环素反应机理。更多还原

【Abstract】 A series of Ag/Ag₂WO₄/g-C₃N₄（AAC） photocatalysts were successfully constructed by the deposition-precipitation method at room temperature. The phase, structure, morphology and optical property of the as-prepared photocatalysts were well characterized by XRD、FT-IR、SEM、Raman、EDS、XPS and TEM. Interestingly, all AAC exhibited prominent photocatalytic activity for tetracycline degradation under visible light illumination. Especially, AAC-3 possessed the highest tetracycline degradation rate(k=0.0571 min^-1). More remarkably, when H₂O₂ was dissolved into reaction system, the degradation rate of tetracycline was further improved(k=0.1488 min^-1), which is 2.53 times as many as that of AAC-3 system. It could be mainly attributed to the enhanced visible-light utilization efficiency, the large surface areas, the high separation rate of photogenic carriers and more active species provided by H₂O₂. Meanwhile, a feasible photocatalytic reaction mechanism was proposed and discussed in detail.更多还原