4.7 Article

Multiscale modification of carbon nitride-based homojunction for enhanced photocatalytic atrazine decomposition

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 630, Issue -, Pages 127-139

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.09.131

Keywords

Graphitic carbon nitride; Homojunction; Photocatalysis; Atrazine degradation

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A PDI-g-C3N4/g-C3N4 homojunction was fabricated via a multiscale modification strategy to enhance photocatalytic atrazine degradation. The homojunction exhibited improved photocatalytic performance due to morphological, molecular, and electronic scale modifications. The study demonstrated that the PDI-g-C3N4/g-C3N4 homojunction was effective in atrazine degradation under different environmental conditions.
Herein, PDI-g-C3N4/g-C3N4 homojunction has been fabricated via the multiscale modification strategy to enhance photocatalytic atrazine degradation. The morphological scale modification was realized by multistep thermal condensation, where the released gas could act as templates to form the porous structure. The molecular scale modification was achieved by the pyromellitic diimide (PDI) decoration, which could distort the planar nanosheet to induce a porous structure and provide more chromophores for better light absorption. The electronic scale modification was realized by the built-in electric field between the PDI-gC(3)N(4)/g-C3N4 homojunction interfaces, which suppressed the recombination of photocarriers. The PDI-gC(3)N(4)/g-C3N4 strengthened photocatalytic atrazine degradation was well-adapted to different environmental influence interference. The optimum atrazine degradation rate within one hour reached 90% in a strong acidic condition (pH = 3.09). It was found that the highly pH-dependent ATZ removal is related to the H2O2 generation during photocatalysis. Within one hour, the PDI-g-C3N4/g-C3N4 could generate 147.38 mu M H2O2. In addition, O-1(2), (A) over cap (.) O-2(-), h(+), and (A) over cap OH were found to have contributed to the ATZ decomposition. During photocatalysis, 14 intermediates and three pathways for atrazine degradation have been found. Hopefully, this study could pave a way for the development of the multiscale modification for the photocatalyst. (c) 2022 Elsevier Inc. All rights reserved.

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