Bifunctional hydroxyl group over polymeric carbon nitride to achieve photocatalytic H2O2 production in ethanol aqueous solution with an apparent quantum yield of 52.8% at 420 nm.

A photocatalytic system of carbon nitride grafted with hydroxyl groups working in ethanol aqueous solution under visible light irradiation was constructed to simultaneously achieve photocatalytic H2O2 production with an apparent quantum efficiency of 52.8% at around 420 nm and ethanol conversion to high-value acetaldehyde with a high selectivity of 99.95%.