Construction of Spherical Flower‐Like Cu‐MOF/BiOBr Composites and Their Photocatalytic Performance

The construction of heterointerfaces can efficiently speed up the separation and transport of charge carriers produced by the photocatalyst, thereby enhancing the photocatalytic degradation performance of materials. A flower‐like Cu‐MOF/BiOBr S‐scheme heterojunction composite was fabricated via a solvothermal method in this study. Ultraviolet‐visible diffuse reflectance spectroscopy (UV–vis DRS), Mott–Schottky and Kelvin probe force microscopy (KPFM) measurements were used to analyze the band structure and electron transport pathways of the Cu‐MOF/BiOBr composite, confirming the successful formation of the S‐scheme heterostructure. Under visible‐light irradiation for 60 min, the 20% Cu‐MOF/BiOBr composite achieved degradation efficiencies of 91.08% for tetracycline (TC) and 92.60% for Rhodamine B (Rh B), demonstrating excellent photocatalytic activity. Radical scavenging and cycling tests revealed the excellent reusability of the composite and identified superoxide radicals (·O 2 − ) and holes (h + ) as the primary reactive species governing the photocatalytic process. Finally, biotoxicity assays proved that the post‐degradation solution exerted no significant inhibition on the germination of mung bean seeds or the growth of Escherichia coli , indicating negligible ecological risk. Collectively, this work provides valuable insights into the rational design of high‐performance photocatalysts and their potential application in sustainable resource recovery.