Co–Fe quantum dots coupled with ultrathin g‐C 3 N 4 nanosheets as efficient and stable photo‐Fenton catalysts

Abstract The Fenton reaction has been widely used in the environmental remediation. However, the sharp decline of photo‐Fenton catalysts activity under neutral conditions is still an urgent problem to be solved. This study reports a Co/Fe bimetallic oxide quantum dots‐coupled g‐C 3 N 4 nanosheets (CoFeO QDs/g‐C 3 N 4 NSs) composites with efficient degradation of organic pollutants under neutral conditions. Under the photo‐Fenton condition, rhodamine B (RhB) degradation efficiency reached 98.32% within 90 min for CoFeO QDs/g‐C 3 N 4 NSs composites. The formed heterojunction between CoFeO QDs and g‐C 3 N 4 NSs achieves enhanced charge transfer and efficient charge separation. Co–Fe bimetals make g‐C 3 N 4 NSs easier to excite the production of ·OH by H 2 O 2 , achieving excellent degradation efficiency and cycle stability for organic pollutants in a wide pH range. Therefore, CoFeO QDs/g‐C 3 N 4 NSs composites can be used as efficient and stable photo‐Fenton catalysts to degrade organic contaminants in practical applications.