Construction of BiOBr/Bi2WO6 S-scheme heterojunction photocatalyst for enhanced photocatalytic degradation for tetracycline removal

In this study, Bi 2 WO 6 /BiOBr S-scheme heterojunction composites were synthesized via a one-step solvothermal method. The experimental results demonstrate that the Bi 2 WO 6 /BiOBr composites exhibit a significant redshift in the light absorption edge and a reduction in bandgap compared with that of individual Bi 2 WO 6 and BiOBr. Meanwhile, the separation and transfer of photogenerated carriers were accelerated in Bi 2 WO 6 /BiOBr composites. In the photocatalytic degradation of tetracycline, the best composite displayed the highest photocatalytic activity, achieving a degradation efficiency of 91.3% after 60 min of light irradiation. Moreover, it maintained good stability even after four cycles. The enhancement in photocatalytic activity is primarily attributed to the formation of the S-scheme heterojunction and the strengthened interfacial interactions.