In this study, CeO₂–Ag/AgBr composite photocatalysts with a Z-scheme configuration were fabricated by in situ interspersal of AgBr on CeO₂ and subsequent photoreduction process. The CeO₂–Ag/AgBr composites exhibited enhanced photocatalytic activity for the photodegradation of ciprofloxacin (CIP) under visible light irradiation. The effects of initial CIP concentration and various inorganic salts were investigated in detail. Three-dimensional excitation–emission matrix fluorescence spectra were used to further monitor the CIP molecule degradation. Plausible degradation pathways for CIP were proposed based on LC-MS instruments. Photoluminescence, electrochemical impedance spectroscopy, and photocurrent tests indicated the rapid transfer and migration of electrons–holes can be achieved in this ternary photocatalytic system. The enhanced photocatalytic performances of CeO₂–Ag/AgBr could be credited to the accelerated interfacial charge transfer process and the improved separation of the photogenerated electron–hole pairs. The existence of a small amount of metallic Ag is conducive to the formation of a stable Z-scheme photocatalytic system. This work would pave the route for the design of novel Z-scheme photocatalytic systems for application in solar-to-fuel conversion and photocatalytic water treatment.

在这项研究中，通过在CeO ₂上原位散布AgBr和随后的光还原过程，制备了Z方案配置的CeO ₂ -Ag / AgBr复合光催化剂。首席执行官₂-Ag / AgBr复合材料在可见光照射下对环丙沙星（CIP）的光降解表现出增强的光催化活性。详细研究了初始CIP浓度和各种无机盐的影响。三维激发-发射矩阵荧光光谱用于进一步监测CIP分子的降解。基于LC-MS仪器，提出了CIP可能的降解途径。光致发光，电化学阻抗谱和光电流测试表明，在这种三元光催化系统中，电子-空穴的快速转移和迁移是可以实现的。CeO ₂的增强光催化性能-Ag / AgBr可以归因于加速的界面电荷转移过程和光生电子-空穴对的改进分离。少量金属银的存在有利于形成稳定的Z型光催化体系。这项工作将为设计用于太阳能转化为燃料和光催化水处理的新型Z方案光催化系统铺平道路。