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(a) XRD patterns, (b) FTIR spectra, (c) solid-state 13C MAS NMR spectra, (d) UV-vis DRS spectra and (e) transformed Kubelka–Munk function versus proton energy plots of raw g-C3N4, H2-pCN, CO2-pCN, and H2+CO2-pCN. (f) XPS valence band spectra of raw g-C3N4 and H2+CO2-pCN.
