Carbon Doping and Oxygen Vacancy-Tungsten Trioxide/CuSnS S-Scheme Heterojunctions for Boosting Visible-Light-Driven Photocatalytic Performance.

Developing ideal photocatalysts for energy regeneration and environmental remediation by combining the advantages of individual semiconductors remains a significant challenge. Herein, tungsten trioxide (WO)/CuSnS S-scheme heterojunction composite photocatalysts are developed. Initially, doped oxygen vacancy (OV) was prepared on two-dimensional WO nanosheets by direct calcination method. Subsequently, CuSnS nanoflowers are produced via a one-step hydrothermal process, which are then used to wrap the WO nanosheets. The close contact between WO and CuSnS, coupled with unsaturated C-OV coordination, enhanced the interfacial electron transport. Under visible light irradiation, the WO/CuSnS shows an impressive H production rate of 3345.26 μmol h g, a significant improvement over the individual performances of WO and CuSnS. Moreover, WO/CuSnS demonstrated the highest photocatalytic tetracycline degradation efficiency, achieving 99.4% degradation within 90 min of illumination. An efficient S-scheme heterojunction system with a well-aligned band structure was successfully constructed. This design effectively extends their lifetime, allowing the heterojunction to achieve maximum efficiency in the light reaction.