Construction of Carbon Dot-Modified g-C3N4/BiOIO3 Z-Scheme Heterojunction for Boosting Photocatalytic CO2 Reduction under Full Spectrum Light

In this study, we successfully constructed a Z-scheme BiOIO3/CQDs/g-C3N4 (BCCN) composite modified with carbon quantum dots (CQDs) for photocatalytic CO2 reduction. A series of characterization approaches and testing technologies were carried out to investigate the components, morphologies, and optical properties of the fabricated photocatalysts. The 0.015B0.01CCN displayed an efficient photocatalytic CO2 reduction activity within 7 h full spectrum light irradiation, producing CO with a rate of 117.88 μmol gcat–1. The enhanced photocatalytic CO2 reduction of the BCCN composite can be attributed to the synergistic effects of CQDs and the Z-scheme heterojunction. This work presents a new insight into integrating CQDs with g-C3N4 and BiOIO3 for the positive synergetic effect to obtain a high-efficient photocatalyst.