The occurrence of fluoroquinolones (FQs) in the ambient environment has raised serious concerns. In this study, the photocatalytic degradation kinetics and mechanism of ciprofloxacin (CIP) was investigated in ordered mesoporous g-C₃N₄ (ompg-C₃N₄). Under simulated sunlight irradiation, ompg-C₃N₄ exhibited a 2.9 fold more rapid reaction for CIP degradation than bulk g-C₃N₄. This enhancement may be attributed to the large specific surface area and effective charge separation of ompg-C₃N₄. The eradication of CIP followed the Langmuir–Hinshelwood (L–H) kinetics model, and surface reactions played a significant role during the photocatalysis process. Further study of reactive species (RSs) by both ESR technology and RSs scavenging experiments revealed that the superoxide anion radical (O₂⁻) and photohole (h⁺) were primarily responsible for the degradation of CIP. Based on the identification of intermediates using liquid chromatography with tandem mass spectrometry (HPLC-MS/MS), and the prediction of reactive sites via Frontier Electron Densities (FEDs), the degradation pathways of CIP were proposed. A comparison of the degradation among FQs revealed that the piperazine moiety showed a dramatic effect on the degradation of FQs during the photocatalysis process. A residual antibiotic activity experiment revealed that ompg-C₃N₄ provided a very desirable performance for the reduction of antibiotic activity. The sufficient photocatalytic degradation of CIP in ambient water revealed that a sunlight-driven ompg-C₃N₄ photocatalytic process may be efficiently applied for the remediation of CIP contaminated natural waters.

周围环境中氟喹诺酮类（FQs）的出现引起了人们的严重关注。在这项研究中，在有序介孔gC ₃ N ₄（ompg-C ₃ N ₄）中研究了环丙沙星（CIP）的光催化降解动力学和机理。在模拟的阳光照射下，ompg-C ₃ N ₄的CIP降解反应比块状gC ₃ N ₄快2.9倍。这种增强可能归因于ompg-C ₃ N ₄的较大的比表面积和有效的电荷分离。CIP的消除遵循Langmuir-Hinshelwood（L-H）动力学模型，并且表面反应在光催化过程中起着重要作用。通过既ESR技术和RSS清除实验反应性物质（RS）的的进一步研究显示，超氧阴离子自由基（O ₂ ^- ）和光空穴（H ⁺）是导致CIP降级的主要原因。基于液相色谱-串联质谱（HPLC-MS / MS）鉴定中间体，并通过前沿电子密度（FEDs）预测反应位点，提出了CIP的降解途径。对FQ之间降解的比较表明，哌嗪部分在光催化过程中对FQ降解表现出显着影响。残留的抗生素活性实验表明，ompg-C ₃ N ₄为降低抗生素活性提供了非常理想的性能。CIP在环境水中的充分光催化降解表明，阳光驱动的ompg-C ₃ N ₄ 光催化过程可以有效地应用于CIP污染的天然水的修复。