Novel In2S3/ZnWO4 heterojunction photocatalysts: facile synthesis and high-efficiency visible-lightdriven photocatalytic activity

摘要

Novel heterojunction photocatalysts In2S3/ZnWO4 were prepared by a hydrothermal and surfacefunctionalized method, and the optimized In2S3/ZnWO4 ratio was tuned to explore their visible-light photocatalytic activity for rhodamine B (RhB) degradation. The heterojunction structure formed by the In2S3 nanoparticles grew on the primary ZnWO4 nanorods. Remarkably, In2S3/ZnWO4 composites exhibited much higher photocatalytic activity than that of the individual In2S3 and ZnWO4. The enhanced activity could be attributed to the strong visible-light absorption and the effective separation and transportance of the photogenerated charges. Moreover, the main active species for the degradation of RhB were also investigated. Then, a possible reaction mechanism for the excellent photocatalytic activity of the In2S3/ZnWO4 composites was proposed.