Magnetic recyclable g-C3N4/Fe3O4@MIL-100(Fe) ternary catalyst for photo-Fenton degradation of ciprofloxacin

The slow Fe(III)/Fe(II) cycle rate seriously limits the photo-Fenton degradation efficiency. In this work, a novel g-C3N4/Fe3O4@MIL-100(Fe) ternary heterojunction catalyst was prepared via a facile in-situ route under a mild reaction condition, and was further used as a photo-Fenton catalyst for efficient degradation of ciprofloxacin via the synergistic effect. Compared with g-C3N4 and Fe3O4@MIL-100(Fe), the composite g-C3N4/Fe3O4@MIL-100 (Fe) exhibited excellent photo-Fenton catalytic activity for high concentration ciprofloxacin (up to 200 mg L-1); approximately 94.7% of CIP was degraded within 120 min light irradiation. It is concluded that g-C3N4 can produce photo-generated electron transfer and further accelerate Fe(III)/Fe(II) cycle, leading to an improvement in the degradation efficiency of ciprofloxacin. In addition, the catalyst presents excellent reusability, whereas the removal efficiency of CIP attained 70.0% after three cycles. This study provided a means to enhance the photo -Fenton activity of Fe-MOFs-based catalysts.