3D flower sphere Bi2S3/Bi4O5Br2 heterojunction: Alleviating photocorrosion and enhanced photocatalytic performance

The 3D flower sphere Bi2S3/Bi4O5Br2 heterojunction was successfully synthesized by handy solvothermal methods. With the addition of nanorod Bi2S3, the morphology of flower sphere Bi4O5Br2 gradually did not appear spherical with a heterojunction interface formed, which accelerated electrons transfer and inhibited the occurrence of photocorrosion. It proved that the Bi2S3/Bi4O5Br2 heterojunction was constructed by XRD, SEM, TEM and XPS. Meanwhile, the light absorption range, intensity, specific surface area and photocurrent of the synthesized materials were prominently improved. The ciprofloxacin (CIP) and tetracycline (TC) were most efficiently degraded by the 0.10BSB. The contribution values of superoxide free radicals (center dot O-2(-)) and holes (h(+)) in the trapping agent experiments were calculated. A rational Z-scheme photocatalytic mechanism for Bi2S3/Bi4O5Br2 heterojunction was proposed in the degradation process.

Automated summary

The 3D flower sphere Bi2S3/Bi4O5Br2 heterojunction was successfully synthesized using convenient solvothermal methods. The addition of nanorod Bi2S3 accelerated electron transfer and inhibited photocorrosion, leading to improvements in light absorption range, intensity, specific surface area, and photocurrent. The 0.10BSB showed the highest degradation efficiency for ciprofloxacin and tetracycline. A rational Z-scheme photocatalytic mechanism for the Bi2S3/Bi4O5Br2 heterojunction was proposed.