Facile synthesis of porphyrin-MOFs with high photo-Fenton activity to efficiently degrade ciprofloxacin

The slow conversion of Fe(II)/Fe(III) cycle was largely limited the degradation efficiency of many photo-Fenton systems. Herein, four Fe-MOFs nanorods (namely Fe-TCPP-1, Fe-TCPP-2, Fe-TCPP-3, Fe-TCPP-4) with decreasing length-diameter ratios were synthesized in a household microwave oven, using photo-sensitizer porphyrin and iron ions with Fenton activity as building blocks. Among them, the Fe-TCPP-3 exhibited high photogenerated electron-hole (e-h(+)) separation efficiency and largest pore structure, endowing Fe-TCPP-3 with superior photo-Fenton property. In addition, Fe-TCPP-3 based photo-Fenton system was applied to efficiently degrade antibiotic ciprofloxacin (CIP) under neutral condition, due to the continuously generated reactive species (h(+), e, OH', O-2(-), O-1(2)) in Fe-TCPP-3 under visible-light irradi-ation. With irradiation for 30 min, the degradation efficiency of the system could reach about 73 %, which was about 26-fold towards the system without light irradiation. This study paved a way to modulating the photo-Fenton activity of MOF-based catalysts. (c) 2022 Elsevier Inc. All rights reserved.

Automated summary

In this study, four Fe-MOF nanorods with different length-diameter ratios were synthesized and used as photo-Fenton catalysts. Among them, Fe-TCPP-3 exhibited high photogenerated electron-hole separation efficiency and a large pore structure, resulting in superior photo-Fenton performance. The Fe-TCPP-3-based photo-Fenton system efficiently degraded the antibiotic ciprofloxacin under neutral conditions, attributed to the continuously generated reactive species in Fe-TCPP-3 under visible-light irradiation.