S-scheme In2S3/Zn3In2S6 microsphere for efficient photocatalytic H2 evolution with simultaneous photodegradation of bisphenol A

S-scheme In2S3/Zn3In2S6 microspheres were successfully prepared through hydrothermal means for enhanced photocatalytic H2 evolution with simultaneous photodegradation of bisphenol A. The microspheres were assembled by embedding 2D In2S3 nanosheets into 2D-3D Zn3In2S6 hierarchical microspheres to enhance visible light absorption and separation/migration of photo-excited charge carriers. In bisphenol A aqueous solution, the photocatalytic H2 evolution rate on In2S3/Zn3In2S6 shows 15.7 and 7.9-folds improvements against that of the individual In2S3 and Zn3In2S6. Meanwhile, the degradation efficiency of bisphenol A is up to 95.8 %. The S-scheme charge transfer mechanism in In2S3/Zn3In2S6 microspheres maximizes exerting the redox capability of Zn3In2S6 for H2 evolution and In2S3 for bisphenol A degradation.