Unraveling the phosphorus-nitrogen bridge in carbon quantum dots/carbon nitride for efficient photodegradation of organic contaminants

Document Type

Journal Article

Publication Title

Carbon

Volume

204

First Page

284

Last Page

294

Publisher

Elsevier

School

School of Science

RAS ID

56579

Funders

National Science and Technology Major Project, China Natural Science Foundation of Jiangsu Province, China China Scholarship Council

Comments

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

Abstract

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.

DOI

10.1016/j.carbon.2022.12.063

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