Construction of highly efficient ternary photocatalytic systems is strongly attracting the attention of researchers. In this study, a novel ternary Ag₂CO₃/CeO₂/AgBr photocatalyst with a double Z-scheme configuration was fabricated by in situ loading of Ag₂CO₃ onto CeO₂ spindles and subsequently via an acid corrosion process. The ternary Ag₂CO₃/CeO₂/AgBr composites exhibited enhanced photocatalytic activity for the photodegradation of levofloxacin (LVF) under visible light irradiation. Three-dimensional excitation–emission matrix fluorescence spectra revealed that the structure of LVF could be destroyed from the fluorescence point of view; liquid chromatograph–mass spectrometer tests indicated that LVF can be degraded via different pathways; a total organic carbon study showed that LVF could be effectively mineralized. Transient photocurrent response, photoluminescence, and electrochemical impedance spectroscopy indicated that ternary Ag₂CO₃/CeO₂/AgBr composites had fast photoinduced charge separation efficiency. Active-species-trapping experiments and an electron spin resonance technique confirmed that h⁺, O₂⁻, and OH all participated in a photodegradation process. On the basic of various performance characterization and experimental results, a double Z-scheme photocatalytic mechanism was proposed. It is expected that the ternary Ag₂CO₃/CeO₂/AgBr composites can be used as a promising photocatalyst for energy conversion and environmental remediation. This work could provide a new approach to constructing ternary hybrid photocatalysts and a comprehensive understanding of the degradation pathways for LVF.

高效的三元光催化系统的构建极大地吸引了研究人员的注意力。在这项研究中，通过将Ag ₂ CO ₃原位负载到CeO ₂锭子上，然后通过酸腐蚀工艺，制备了具有双重Z方案构型的新型三元Ag ₂ CO ₃ / CeO ₂ / AgBr光催化剂。三元Ag ₂ CO ₃ / CeO ₂/ AgBr复合材料在可见光照射下对左氧氟沙星（LVF）的光降解表现出增强的光催化活性。三维激发-发射矩阵荧光光谱表明，从荧光的角度来看，LVF的结构可能被破坏。液相色谱-质谱仪测试表明，LVF可以通过不同途径降解。一项总有机碳研究表明，LVF可以有效地矿化。瞬态光电流响应，光致发光和电化学阻抗谱表明三元Ag ₂ CO ₃ / CeO ₂/ AgBr复合材料具有快速的光诱导电荷分离效率。活性种捕获实验和电子自旋共振技术证实ħ ⁺，Ö ₂ ^- ，和OH所有参与了光降解过程。在各种性能表征和实验结果的基础上，提出了双重Z-方案的光催化机理。期望三元Ag ₂ CO ₃ / CeO ₂ / AgBr复合材料可以用作有前途的光催化剂，用于能量转换和环境修复。这项工作可以提供一种构建三元杂化光催化剂的新方法，并全面了解LVF的降解途径。