Breaking Dual Constraints of Charge Separation and Redox Capability in BP/BiOBr S‐Scheme Heterojunction for Boosted Solar‐Driven Disinfection

ABSTRACT The application of traditional photocatalysts is fundamentally constrained by inefficient charge separation and limited redox capability. To address these challenges, a 2D/2D S‐scheme heterojunction was constructed through precise assembly of ultrathin bismuth oxybromide (BN) and black phosphorus nanosheets (PN). This well‐defined interface clearly promoted charge separation and transport while maintaining strong redox potentials through the S‐scheme mechanism, thereby significantly boosting the oxygen activation capacity and overall reactive oxygen species (ROS) yield through both direct oxidation and H 2 O 2 ‐mediated pathways. The 1.0PN/BN was identified as the optimal composite through a systematic screening process, demonstrating superior charge separation and ROS production efficiency compared to other ratios and individual components, leading to potent and reliable disinfection performance. H 2 O 2 served as a crucial precursor sustaining continuous ·OH generation, thereby promoting the disinfection performance. Finally, the practical potential of this material was further evaluated in an oxygen‐aeration “water wheel reactor”, where it exhibited excellent H 2 O 2 activation, disinfection, and stability throughout 2 h continuous operation. This work provides a blueprint for translating advanced photocatalyst design into practical water treatment.