In-situ construction of Bi2WO6/Bi5O7I heterojunctions by room-temperature solvent method for efficient photocatalytic degradation

In the present work, the flower spherical Bi 2 WO 6 /Bi 5 O 7 I S-scheme heterojunction was constructed by solution precipitation under room-temperature for photocatalytic degradation of organic pollutants and the working mechanism was investigated. As a special feature, 0.05 BWBOI performed the best photocatalytic capacity under visible light irradiation and was significantly able to degrade 98% of rhodamine B and 92% of bisphenol A in 90 min, whereas ciprofloxacin was degraded to 67% in 120 min. The composite structure was determined by XRD, FT-IR, XPS, and BET characterization, while the electron migration direction and heterojunction scheme were determined by electrochemical and ESR characterization. Eventually, addition of Bi 2 WO 6 not only broadened the light absorption range of the composites, but also achieved the successful construction with Bi 2 WO 6 /Bi 5 O 7 I of S-scheme heterojunctions to accelerate the transport rate of photogenerated carriers. Finally, the current work presents a novel bismuth-based photocatalyst and offers new ideas for the facile preparation of semiconductor heterojunctions.