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The modification of photocatalyst was the vital task for improving photocatalytic performance. Inspired by multi-level effect and activation regions of N atom, multi-level bismuth-based spheres (Bi 2 Ti 2 O 7 ) and N-doped graphene quantum dots (N-GQD) were constructed for the photocatalytic application. Experiments demonstrated that the N-GQD/Bi 2 Ti 2 O 7  multi-level spheres showed higher photocatalytic performance due to the multi-level effect and activation regions. Meanwhile, a series of characterizations proved that the separation efficiency of electron–hole pairs was improved after the N-GQD modifications. A possible mechanism was proposed for investigating N-GQD/Bi 2 Ti 2 O 7  materials in the photocatalytic field.

N-doped graphene quantum dots for enhancing multi-level Bi 2 Ti 2 O 7 spheres photocatalytic activity via electronic trapping