Synergistic effects of holey nanosheet and sulfur-doping on the photocatalytic activity of carbon nitride towards NO removal

Photocatalysis provides a sustainable way for NOx elimination. However, efficient and safe photocatalytic removal of NOx remain a great challenge due to the limited light-harvesting ability and quick recombination of charge carriers. Herein, holey sulfur-doped g-C3N4 nanosheets (CNN–S) was reported...

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Published in:Chemosphere (Oxford) 2023-03, Vol.316, p.137813-137813, Article 137813
Main Authors: Qi, Zheng, Chen, Jinbao, Zhou, Weichuang, Li, Yuhan, Li, Xiaofang, Zhang, Sushu, Fan, Jiajie, Lv, Kangle
Format: Article
Language:English
Subjects:
Adsorption
Carbon nitride
Light
Photocatalytic oxidation
Sulfur
Thioacetamide
Visible light
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Summary:Photocatalysis provides a sustainable way for NOx elimination. However, efficient and safe photocatalytic removal of NOx remain a great challenge due to the limited light-harvesting ability and quick recombination of charge carriers. Herein, holey sulfur-doped g-C3N4 nanosheets (CNN–S) was reported by directly calcining a mixture of hydrolyzed dicyandiamide and thioacetamide. The specific surface area of the pristine g-C3N4 nanosheets (CNN–S0) is 3–4 times higher than bulk g-C3N4 (BCN), and the photocatalytic NO removal rate also increased from 17% (BCN) to 35% (CNN–S0). The effect of sulfur content on the photocatalytic performance was systematic studied, and CNN–S0.5 sample exhibits the highest NO removal rate (53%). The high photoreactivity of S-doped g-C3N4 nanosheets can be attributed to enhanced visible light absorption, increased specific surface area, and effective separation and transfer of photo-generated charges owing to the synergistic effect of the nanosheet structure and sulfur doping. In addition, density functional theory calculations show that the doping of S is also beneficial to the adsorption and activation of the reactants on CN. [Display omitted] •Holey S-doped sheet-like g-C3N4 was prepared by calcining the mixture of hydrolyzed dicyandiamide and thioacetamide.•Doping g-C3N4 nanosheets with S greatly improves the light harvesting ability.•The BET surface area of S-doped g-C3N4 nanosheets is 3 times larger than that of bulk g-C3N4.•S-doped g-C3N4 nanosheets exhibit enhanced photocatalytic activity towards NO oxidation.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2023.137813