Block or flake photocatalysts are often prepared in such a way that agglomeration occurs, resulting in fast rate of photogenerated electron-hole complexation greatly reduces photocatalytic performance. Therefore, a rational design of the catalyst structure is beneficial to improve its photodegradation performance. In this paper, we reported for the first time new S-scheme heterojunction Co₃O₄/Bi₂MoO₆@g-C₃N₄ hollow microspheres. The introduction of the co-catalyst Co₃O₄ creates an internal electric field between Bi₂MoO₆ and g-C₃N₄, which more efficiently promotes the separation of photogenerated electrons and holes to accelerate carrier transfer and thus improves the overall performance of the composites. Under visible light irradiation, Co₃O₄/Bi₂MoO₆@g-C₃N₄ hollow microspheres degraded levofloxacin (LVFX) by up to 95.21%. After 3 cycles the degradation rate was still above 80% and the XRD spectrum did not change significantly, they are extremely stable. More importantly, the toxicity of the final product of each pathway was found to be lower than that of the parental species after intermediate testing and toxicity evaluation. The present work also suggests possible transfer pathways and degradation mechanisms for photogenerated carriers. The work provides a new idea for the efficient degradation of antibiotics by S-scheme nanocomposites.

块状或片状光催化剂通常以发生团聚的方式制备，导致光生电子 - 空穴络合的快速速率大大降低光催化性能。因此，合理设计催化剂结构有利于提高其光降解性能。在本文中，我们首次报道了新型S型异质结Co ₃ O ₄ /Bi ₂ MoO ₆ @gC ₃ N ₄空心微球。助催化剂Co ₃ O _{4的引入在Bi 2} MoO ₆和gC ₃ N ₄之间产生内部电场，更有效地促进光生电子和空穴的分离，加速载流子转移，从而提高复合材料的整体性能。可见光照射下，Co ₃ O ₄ /Bi ₂ MoO ₆ @gC ₃ N ₄空心微球可将左氧氟沙星 (LVFX) 降解高达 95.21%。3个循环后降解率仍在80%以上，XRD图谱无明显变化，非常稳定。更重要的是，经过中间测试和毒性评估，发现每个途径的最终产物的毒性均低于亲本物种。目前的工作还提出了光生载流子可能的传输途径和降解机制。该工作为S型纳米复合材料高效降解抗生素提供了新思路。