Synthesis of BiOI/Bi 4 O 5 I 2 /Bi 2 O 2 CO 3 p–n–p heterojunctions with superior photocatalytic activities

The formation of p–n heterojunctions among BiOI, Bi 4 O 5 I 2 and Bi 2 O 2 CO 3 enhances the charge transfer and separation of the photogenerated carriers and photocatalytic activity.