BiOBr/NiS Schottky Junction Nanoflowers With Accelerated Charge Separation for Photocatalytic Degradation of High‐Concentration Rhodamine B

ABSTRACT BiOBr holds significant promise for organic pollutant degradation due to its appropriate bandgap and favorable visible light response. However, its photocatalytic efficiency is constrained by insufficient active sites and slow photogenerated charge separation. Herein, a novel nanoflower‐like BiOBr/NiS Schottky junction photocatalyst is synthesized via a facile one‐step solvothermal method. The incorporation of metallic NiS not only promotes the formation of a unique nanoflower structure, but also creates a moderate content of oxygen vacancy, which leads to a larger specific surface area and the enhanced photogenerated electron transfer, respectively. Notably, the established Schottky junction enables the directional electron transfer from BiOBr to NiS, which enhances charge carrier separation and thus further improves photocatalytic activity. The BiOBr/NiS catalyst achieves a superior degradation efficiency of 92.4% for 30 mg·L −1 of Rhodamine B within 50 min, representing nearly fourfold higher than pristine BiOBr. Radical trapping experiments further confirm that ·O 2 − and h + are the dominant active species for photodegradation reaction. This work demonstrates an innovative strategy combining Schottky junction engineering with morphological optimization to boost the performacne of solar‐driven contaminant removal.