Unraveling the phosphorus-nitrogen bridge in carbon quantum dots/carbon nitride for efficient photodegradation of organic contaminants
School of Science
National Science and Technology Major Project, China Natural Science Foundation of Jiangsu Province, China China Scholarship Council
Limited transport and migration of photoinduced charges in polymeric carbon nitride (g-C3N4) within the planar layers remain a great challenge for achieving favorable photocatalysis. Herein, phosphorus-doped carbon quantum dots (PCDots) implanted intra-layer carbon nitride nanosheet (PCDots-C3N4) photocatalyst with phosphorus-nitrogen (P–N) bridging was prepared. The 13C and 31P of nuclear magnetic resonance, X-ray photoelectron spectroscopy, and density functional theory calculations confirmed the formation of a P–N bridge. Additionally, implanting PCDots enlarged the π-π conjugated electronic structure and modulated the plane structure of g-C3N4. The atomic-level connection by the P–N bridge dramatically extended the delocalization effect and facilitated the intramolecular charge transfer. PCDots-C3N4 demonstrated efficient photodegradation of tetracycline hydrochloride (TC) and bisphenol A (BPA) than both g-C3N4 and CDots-C3N4, reaching 76% and 100%, respectively. The possible degradation pathways of TC and BPA were also discussed. This work provides an efficient strategy for rapid electron transfer to form a new paradigm for wastewater remediation.
Wang, Y., Chen, L., Zhao, X., Song, H., He, F., Cheng, S., . . . Wang, S. (2023). Unraveling the phosphorus-nitrogen bridge in carbon quantum dots/carbon nitride for efficient photodegradation of organic contaminants. Carbon, 204, 284-294. https://doi.org/10.1016/j.carbon.2022.12.063