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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 (O₂radical dot⁻) and photohole (h⁺) were primarily responsible for the degradation of CIP. Based on the …