Abstract
Although the g-C3N4/TiO2 Z-scheme heterojunction has superior photocatalytic performance; however, photocatalytic efficiency is still limited by the fast recombination of photoexcited charges. Herein, we propose an electrostatic self-assembly technique to enhance the photocatalytic activity by decorating carbon quantum dots (CQDs) onto the heterojunction. The relationships among composition, phase structure, electrochemical and catalytic performances were investigated, indicating the adhesion of CQDs. A fantastic photocatalytic capability was achieved in 80 μL CQDs/g-C3N4/TiO2, and the photocatalytic activity exhibited exceptional stability and broad applicability for the degradation of rhodamine B (>99 %) and tetracycline hydrochloride (>91 %) under both ultraviolet and visible light irradiation, owing to the significant enhancement of photogenerated carrier separation by CQDs. In the photocatalytic reaction, h+ is the most essential active group through the free radical trapping experiment. This research serves as a guide for modifying photocatalysts. This study provides a promising system to promote photocatalytic efficiency, and the CQDs/g-C3N4/TiO2 to be used for antibiotic and organic pollutant removal on a large scale.
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