Boosted charge transfer in dual Z-scheme BiVO@ZnInS/BiSnO heterojunctions: Towards superior photocatalytic properties for organic pollutant degradation.

A core-shell structured dual Z-scheme ternary photocatalyst BiVO@ZnInS/BiSnO was fabricated via hydrothermal and heat-circumfluence strategy. With ZnInS serving as a bridge to connect BiVO and BiSnO, the developed ternary catalyst displayed boosted charge transfer and spatial separation capabilities. The effect of mass ratios of BiVO@ZnInS and BiSnO on photodegradation efficiency under visible light irradiation was explored. The optimal ternary heterojunction photocatalyst possessed remarkable photocatalytic rate constant for Rhodamine B (RhB) degradation, which was 63 and 12 times higher than that of BiVO and BiSnO, respectively. In addition, the as-prepared ternary photocatalyst had good universality. Notably, the novel dual Z-scheme photocatalysts could improve the separating/transferring efficiency and reduction/oxidation ability of charge carriers. Meanwhile, the hierarchical structure offered sufficient reaction sites for photodegradation. This work provides a new insight into the rational design of ternary dual Z-scheme photocatalysts.