Construction of highly active Fe/N-CQDs/MCN1 photocatalytic self-Fenton system for degradation of ciprofloxacin

In the graphitic carbon nitride-based photocatalytic reaction, the redox ability and electron transport ability of photocatalyst have an important influence on its activity. The Photo-Fenton reaction system was constructed by modifying N-doped carbon quantum dots (N-CQDs) on the surface of supramolecular self-assembled carbon nitride and introducing Fe ions into the carbon nitride planar structure. The xFe/N-CQDs/MCN1 catalysts with different iron contents were prepared, which had significant degradation effect on organic pollutants. Among them, 0.2Fe/N-CQDs/MCN1 degraded 76% of ciprofloxacin (CIP) within 120 min. Various characterizations demonstrate that photocatalytic activity are enhanced due to the surface modification of N-CQDs enhancing electron transfer rate on the surface of photocatalysts and the doping of Fe ions providing active sites for Fenton reaction. At the same time, the formation of chemical bonds limits the leaching of iron and avoids secondary environmental pollution. These results indicate that the novel catalyst has excellent application potential in the field of environmental photocatalysis.