Interfacial Charge Modulation: Carbon Quantum Dot Implanted Carbon Nitride Double-Deck Nanoframes for Robust Visible-Light Photocatalytic Tetracycline Degradation
Steering charge kinetics at interface is essential to improve the photocatalytic performance of two-dimensional (2D) material-based heterostructures. Herein, we developed a novel strategy---simultaneously building two kinds of heterojunctions----to modulate interfacial charge kinetics in polymeric carbon nitride (CN) for improving photocatalytic activity. Using a simple one-step thermal condensation of carbon quantum dots (CQDs)-contained supramolecular precursors formed in water, the controllable CQDs embedded CN nanoframes possessed two kinds of heterogeneous interfaces within seamlessly stitching micro-area two-dimensional in-plane and out-of-plane domains. These two kinds of heterojunctions can effectively enhance its intrinsic driving force to accelerate the separation and transfer of charge along different directions. Furthermore, the hollow double-deck porous CN-CQDs nanoframes with a high surface area (296.74 m2·g−1) endowed more active sites exposed. The remarkable visible-light photocatalytic activity of hollow porous CN-CQDs nanoframes was demonstrated by degrading tetracycline (TC) and rhodamine (RhB) as models, which its robust degradation rate constant is approximately 11 and 29 times higher than those of pristine CN, respectively. This work provides a novel strategy of the interface design of heterophase junction with atomic precision.