Facile Fabrication of Bi₂₄O₃₁Br₁₀ Nanosheets with Phosphorus Sulfide Quantum Dots for Highly Photocatalytic Treating Organic Dyes

Abstract Herein, we report the synthesis of novel narrow band gap phosphorus sulfide quantum dots (PSQDs)‐modified bismuth oxybromide (Bi 24 O 31 Br 10 ) heterojunction (noted as BOB/PS) for the highly efficient photo‐degradation of hazardous organic pollutants including rhodamine B (RhB), methyl orange (MO), and malachite green (MG). Such a high photocatalytic activity of BOB/PSQDs heterojunction derives from the improved visible‐light response capacity, high surface area/pore volume, and suitable band structure for efficient electron transfer to generate reactive oxygen species (ROS). ROS trapping experiments demonstrate that hydroxy (⋅OH) and superoxide radicals (⋅O 2 − ) play important roles in the photo‐degradation. A possible S‐scheme mechanism for the enhanced photocatalytic activity of BOB/PS is proposed.