Direct Z-scheme WO3/In2S3 heterostructures for enhanced photocatalytic reduction Cr(VI)

The design of efficient and stable photocatalysts for the removal of heavy metals in the environment has become a research hotspot. Here, a composite photocatalyst with three-dimensional In2S3 microspheres supported by WO3 nanoparticles was synthesized for the photoreduction of Cr(VI) for the first time. The constructed composite catalyst has a direct Z-scheme electron transport mechanism without any precious metals (Au, Pt, and Ag), quantum dots (TiO2 QDs) or carbon materials (Graphene) as electronic media. Constructing a direct Z-scheme WO3/In2S3 photocatalyst can greatly retain the reduction and oxidation reaction sites on the surface of the heterojunction and accelerate the reduction reaction. Under visible light irradiation, it greatly promotes the photocatalytic reduction of Cr(VI), which is 67.7 times and 3.6 times the reduction rates of WO3 and In2S3 , respectively. The favorable photocatalytic performance of WO3/In2S3 should be attributed to the effective interfacial contact between the semiconductors in the Z-scheme system, thereby realizing effective electron transfer and charge separation. In addition, the stability of WO3/In2S3 was studied, and a possible mechanism in the photoreduction process of Cr(VI) was proposed.(C) 2022 Elsevier B.V. All rights reserved.