(A) Schematic illustration of preparation for ACN*. (B) The two-dimensional valence-electron density color-filled maps of CN, ACN, and ACN* (multi-directional spliced diagram). (C) BPA degradation experiments. (D) Transient photocurrent responses of ACN* adsorbed different pollutants. (E) BMPO spin-trapping EPR spectra for O₂^•−. (F) Electrostatic potential (ESP) maps of the g-C₃N₄ model compounds, i.e., monomer (leftmost column), dimer (second column), trimer (third column) and tetramer (rightmost column). (G) Solid EPR spectra of BCN and LCN before and after adsorbing different pollutants. (H) UV-vis DRS spectra of BPA, BCN and LCN under different condition. (I) Transient photocurrent response spectra of LCN before and after adsorbing different pollutants in air/Ar condition. (J) BMPO spin-trapping EPR spectra for BMPO-O₂^•− in the HTCN system. (A)–(E) Adapted with permission from ref. [110], Copyright©2019, Elsevier; (F)–(I) adapted with permission from ref. [111], Copyright©2021, Elsevier; (J) adapted with permission from ref. [112], Copyright©2022, American Chemical Society.