Property of CQDs/ZnIn2S4/WO3 heterojunction catalysts for photocatalytic hydrogen production performance

Lignin quantum carbon dots (CQDs) were prepared using basic lignin as the carbon source. They were loaded onto Z-type ZnIn 2 S 4 /WO 3 heterojunction semiconductor materials by a one-step hydrothermal method to construct a ternary composite photocatalyst. Taking the photocatalytic water hydrogen evolution reaction performance as an indicator, it was found that the 33% CQDs/ZnIn 2 S 4 /WO 3 composite photocatalyst exhibited the highest hydrogen evolution reaction rate of 15.355 mmol·h −1 ·g −1 , which was twice as high as that of ZnIn 2 S 4 /WO 3 (7.522 mmol·h −1 ·g −1 ). This study successfully constructed CQDs/ZnIn 2 S 4 /WO 3 tenary heterojunction photocatalyst with excellent and stable hydrogen production performance, which fully demonstrated the feasibility of loading lignin-based CQDs to enhance the photocatalytic performance of ZnIn 2 S 4 for high-value utilization of lignin.