Carbon nitride nanoplatelet photocatalysts heterostructured with B-doped carbon nanodots for enhanced photodegradation of organic pollutants.

•B-doping carbon nanodots (B-C-dots) were decorated on the surface of C3N4.•Effectively enhanced photocatalytic activity was observed on B-C-dots decorated C3N4.•The type-II heterojunction of C3N4 and B-C-dots improved the photocatalytic activity.•Effect of B doping level of C-dots on the photocatalytic activity was investigated.