(A) XPS spectra in Cu 2p and O 1s for CN-Cu(II)-CuAlO₂. (B) EPR spectra of the fresh g-C₃N₄, CuAlO₂, and CN-Cu(II)-CuAlO₂ samples. (C) DFT calculations for the optimized structure (left) and the corresponding two-dimensional valence-electron density color-filled maps (right) of the CN-Cu(II)-CuAlO₂ model in -Cu(II)-CN vision fragment and -CN vision fragment. (D) BPA degradation curves in various suspensions with H₂O₂ (the inset shows the corresponding kinetic curves) and TOC removal curves during BPA degradation. (E) H₂O₂ decomposition curves during BPA degradation in CuAlO₂ and CN-Cu(II)-CuAlO₂ suspensions. (F) EPR spectra for ^•OH and (d) HO₂^•/O₂^•− in various suspensions in the presence of H₂O₂ with and without pollutants. Adapted with permission from ref. [26], Copyright©2018, American Chemical Society.