Visible-light photocatalytic O2-to-H2O2 via nitrogen-graphene quantum dots-modified Bi2Fe4O9 for synchronizing the reduction of Cr(VI) and oxidation of organic contaminants: Kinetics, mechanism, and performance

[Display omitted] •N-GQDs/Bi2Fe4O9 suppress charge recombination and electron accumulation.•N-GQDs/Bi2Fe4O9 enhances in-situ H2O2 generation and H2O2 activation.•Electrons accumulation around N-GQDs accelerate the redox cycles of Fe(II)/Fe(III).•N-GQDs/Bi2Fe4O9 achieves simultaneous toxic Cr(VI) red...

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