Oxygen-vacancy-rich AgBiO3/Bi5O7I heterojunction for antibiotic photodegradation

Semiconductor photocatalysis antibiotic degradation technology has garnered significant advantages such as efficient energy consumption, environmental remediation and high security. To date, advanced strategies for constructing materials with oxygen vacancies and heterogeneous interfaces have been actively explored. Herein, we proposed the targeted assembly of perovskite AgBiO 3 featuring full-spectrum absorption with oxygen-vacancies-rich Bi 5 O 7 I toward the semiconductor photocatalysis antibiotic degradation, constructing a high-performance heterogeneous photocatalytic system through atomic-level oxygen vacancy engineering and electronic structure modulation at the heterointerface.The as-deigned AgBiO 3 /Bi 5 O 7 I composite achieves 99% tetracycline and 93% ciprofloxacin degradation within 20–30 min under visible light. Combined with ESR and other experimental results, the photocatalytic reaction mechanism is elucidated: the combination of AgBiO 3 and Bi 5 O 7 I forms a Z-scheme heterojunction that enhances electron-hole separation efficiency and broadens the light absorption spectrum, in which superoxide radicals (·O 2 − ) serve as the primary reactive species to attack antibiotic molecules, thereby achieving efficient pollutant degradation. This work establishes a paradigm for designing efficient photocatalytic antibiotic degradation systems, as well as advancing the fundamental understanding of oxygen vacancy engineering, interfacial charge modulation, and reaction kinetics in heterostructured photocatalysts.