Selective H 2 O 2 conversion to hydroxyl radicals in the electron-rich area of hydroxylated C-g-C 3 N 4 /CuCo–Al 2 O 3

Twice the amount of ˙OH as that of the reacted H 2 O 2 is produced via two electron transfer processes from the electron-rich Cu centers to H 2 O 2 and from H 2 O to the N atom of the OH–CCN/CuCo–Al 2 O 3 composite, which results in extremely high activity for pollutant degradation with a high utilization efficiency of H 2 O 2 .