Bi2MoO6/ZnIn2S4 S-scheme heterojunction containing oxygen vacancies for photocatalytic degradation of organic pollutant

Photocatalytic removal of organic pollutants is a promising strategy to alleviate environmental pollution. In this study, S-scheme heterojunctions Bi2MoO6/ZnIn2S4 (BMO/ZIS) containing oxygen vacancies were synthesized by the solvothermal method. Oxygen vacancies improved the utilization of sunlight and accelerated the separation of charge carriers. The S-scheme charge transfer mechanism provided a channel for the directed migration of photogenerated charges. 10Bi2MoO6/ZnIn2S4 (10BMO/ZIS) efficiently degraded various organic pollutants with a small amount of photocatalyst (15 mg) under visible light irradiation. 10BMO/ZIS presented the highest RhB removal efficiency of 96.52 %, which was 7.02 and 3.67 times greater than Bi2MoO6 containing oxygen vacancies (BMO-Vo) and ZnIn2S4 (ZIS), respectively. Meanwhile, in various inorganic salt ion solutions, 10BMO/ZIS still exhibited high degradation performance. In addition, the photocatalytic degradation pathway was inferred, and the threat of degradation intermediates to the ecological environment was evaluated. This work contributes to a deeper understanding of the photocatalytic mechanisms of oxygen vacancy-modified heterojunction photocatalysts and offers insights for designing efficient environmental remediation photocatalysts. © 2024