Porous nitrogen-defected carbon nitride derived from a precursor pretreatment strategy for efficient photocatalytic degradation and hydrogen evolution

Abstract

Graphitic carbon nitride (g-C3N4) has attracted extensive research attention because of its virtues of a metal-free nature, feasible synthesis, and excellent properties. However, the low specific surface area and mediocre charge separation dramatically limit the practical applications of g-C3N4. Herein, porous nitrogen defective g-C3N4 (PDCN) was successfully fabricated by the integration of urea-assisted supramolecular assembly with the polymerization process. Advanced characterization results suggested that PDCN exhibited a much larger specific surface area and dramatically improved charge separation compared to bulk g-C3N4, leading to the formation of more active sites and the improvement in mass transfer. The synthesized PDCN rendered a 16-fold increase in photocatalytic tetracycline degradation efficiency compared to g-C3N4. Additionally, the hydrogen evolution rate of PDCN was 10.2 times higher than that of g-C3N4. Meanwhile, the quenching experiments and electron spin resonance (ESR) spectra suggested that the superoxide radicals and holes are the predominant reactive species for the photocatalytic degradation process. This study may inspire the new construction design of efficient g-C3N4-based visible-light photocatalysts.

RAS ID

52172

Document Type

Journal Article

Date of Publication

1-1-2022

Funding Information

National Science and Technology Major Project

Natural Science Foundation of Jiangsu Province

School

School of Engineering

Copyright

subscription content

Publisher

ACS

Comments

He, F., Cheng, S., Song, H., Zhao, C., Zhang, J., Wang, S., & Sun, H. (2022). Porous nitrogen-defected carbon nitride derived from a precursor pretreatment strategy for efficient photocatalytic degradation and hydrogen evolution. Langmuir, 38(2), 828-837.

https://doi.org/10.1021/acs.langmuir.1c02884

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Link to publisher version (DOI)

10.1021/acs.langmuir.1c02884