Research PaperCuInS2 quantum dots embedded in Bi2WO6 nanoflowers for enhanced visible light photocatalytic removal of contaminants

- CuInS2 quantum dots/Bi2WO6 (CIS-BWO) hybrids have been successfully constructed.
- The formation of BiS bond promotes the electron transferring at the interface.
- CIS-BWO heterojunction exhibits enhanced photocatalysis in oxidation and reduction.

Novel CuInS2 quantum dots (CIS-QDs)/Bi2WO6 3D composites were successfully synthesized through a facile deposition process, followed by low temperature calcination. The ternary p-type CIS-QDs were highly dispersed onto the surface of flower-like n-type Bi2WO6 nanosheets to form p-n heterojunction and simultaneously tune the behaviors of photogenerated charge carriers, resulting in higher photocatalytic efficiencies of toluene degradation and Cr(VI) reduction under visible light irradiation, which are 3.0 and 8.5 times higher than those of Bi2WO6, respectively. The photoelectrochemical investigations indicate that the introduction of CIS-QDs synergistically enhanced the harvesting efficiency of solar energy in the p-n heterojunction system with the internal electric field and reduced transfer barrier of photoinduced charge carriers by forming the unique BiS bonds between the CIS-QDs and flower-like Bi2WO6.

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