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Reaction mechanism analysis. a), b) Images of the fresh gCN−OH and pristine gCN in 1 vol % water‐dioxane under dark and post irradiation under deaerated conditions. c), d) ESR spectra of the photocatalyst‐dioxane suspension with 1 vol % water and spin trap (DMPO). Reaction conditions: 10 mg catalyst in 2 mL 1 vol % water‐dioxane and 8 mM nitrobenzene under deaerated conditions, 410 nm LED (30 mW cm−2).
