The development of stable, efficient photocatalyst for environmental antibiotics degradation is great significant and remains a major challenge. Herein, zero dimensional Co₃O₄ nanodots are grown in situ onto two dimensional TiO₂ nanosheets, successfully producing a Z-scheme heterojunction Co₃O₄/TiO₂ photocatalyst for the photocatalytic degradation of enrofloxacin. The synthesized nanohybrid exhibits superior photodegradation performance (0.0269 min⁻¹ for enrofloxacin) and excellent stability (four cycles). The matched energy bands allow the formation of the Z-scheme heterojunction, and the built-in electric field provides the reaction driving force. The formed Z-scheme heterojunction can simultaneously inhibit photoinduced electron-hole recombination, boost photoinduced charge carrier transfer, and produce more active electrons and holes, therefore generating more active species for eventual photocatalytic degradation. In addition, a the possible enrofloxacin degradation pathway was proposed based on simulated calculations and GCMS analysis. This work can inspire further design and construction of Z-scheme heterojunction photocatalysts.

稳定，高效的光催化剂对环境抗生素的降解研究意义重大，仍然是一项重大挑战。在此，将零维Co ₃ O ₄纳米点原位生长到二维TiO ₂纳米片上，成功地制备了用于Z-化学异质结的Co ₃ O ₄ / TiO ₂光催化剂，用于光催化降解恩诺沙星。合成的纳米杂化物表现出优异的光降解性能（0.0269 min ^-1（对于恩诺沙星）和优异的稳定性（四个周期）。匹配的能带允许Z方案异质结的形成，并且内置电场提供了反应驱动力。形成的Z型异质结可以同时抑制光诱导的电子-空穴复合，促进光诱导的电荷载流子转移，并产生更多的活性电子和空穴，因此产生了更多的活性物种，最终导致光催化降解。此外，基于模拟计算和GC MS分析，提出了可能的恩诺沙星降解途径。这项工作可以激发Z方案异质结光催化剂的进一步设计和构建。