Abstract
Visible-near infrared (Vis-NIR) light accounts for ~95% of solar light. In recent years, rational design of Vis-NIR responsive photocatalyst with improved photocatalytic performance has attracted growing concern. In this work, a Vis-NIR responsive photocatalyst was developed by integrating core–shell structured Ag@nitrogen-doped carbon quantum dots (N-CQDs) with BiVO4 nanosheets. The efficiencies of tetracycline hydrochloride (TC) removal based on the BiVO4/Ag@N-CQDs composite were 80.37% and 65.67% under visible light irradiation (λ > 420 nm) for 60 min and NIR light irradiation (λ > 760 nm) for 180 min, respectively. This improved photocatalytic performance of BiVO4/Ag@N-CQDs composite stems from the synergistic effect between BiVO4 nanosheets and core–shell structured Ag@N-CQDs nanoparticles. The as-prepared BiVO4/Ag@N-CQDs composite exhibits surface plasmon resonance (SPR) and molecular oxygen activation. Thus, the charge separation, light absorption in Vis-NIR region and oxidation ability are boosted during the photocatalytic activity. This work provides a new insight for designing advanced structure of Vis-NIR responsive photocatalyst.
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