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Structural characterization of the photocatalyst. a)–c) 1H, 15N and 13C ssNMR of pristine gCN synthesized from thermal pyrolysis of 15N labelled urea and gCN−OH from KOH treatment of the as‐synthesized 15N labeled gCN. d)–f) FTIR, XPS and PL of gCN and gCN−OH.
