Molecular engineering of polymeric carbon nitride for highly efficient photocatalytic oxytetracycline degradation and H2O2 production

[Display omitted] •A novel HDMP grafted CN photocatalyst (ACN) is synthesized.•DFT calculations elucidate subtle alterations of electronic structures.•Femtosecond transient absorption spectroscopy reveals intramolecular charge carrier dynamics.•ACN photocatalyst exhibits superior visible-light-drive...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2020-09, Vol.272, p.118970, Article 118970
Main Authors: Yang, Yang, Zeng, Guangming, Huang, Danlian, Zhang, Chen, He, Donghui, Zhou, Chengyun, Wang, Wenjun, Xiong, Weiping, Li, Xiaopei, Li, Bisheng, Dong, Wanyue, Zhou, Yin
Format: Article
Language:English
Subjects:
Carbon
Carbon nitride
Catalytic activity
Environmental degradation
H2O2 production
Hydrogen peroxide
Molecular engineering
Oxytetracycline
Oxytetracycline degradation
Photocatalysis
Photocatalysts
Photodegradation
Pollutants
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Summary:[Display omitted] •A novel HDMP grafted CN photocatalyst (ACN) is synthesized.•DFT calculations elucidate subtle alterations of electronic structures.•Femtosecond transient absorption spectroscopy reveals intramolecular charge carrier dynamics.•ACN photocatalyst exhibits superior visible-light-driven photocatalytic activity for OTC degradation and H2O2 production. Developing highly efficient photocatalysts for refractory pollutants degradation and hydrogen peroxide (H2O2) production is an ideal strategy to tackle environmental pollution and energy crisis. Herein, we synthesize a novel 2-hydroxy-4,6-dimethylpyrimidine (HDMP) grafted polymeric carbon nitride (CN) photocatalyst (ACN) by a facile in situ keto-enol cyclization method for addressing these issues. The photogenerated electrons and holes are migrated to HDMP and heptazine moiety, respectively. And the average decay lifetime of photogenerated charges of CN and ACN-10 is increased form (222 ± 23) to (289 ± 38) ps. Benefiting from the controllable electronic migration and accelerated intramolecular charge separation, the ACN photocatalyst exhibits a superior visible-light-driven photocatalytic activity for oxytetracycline degradation and H2O2 production. This work makes an insight into the intramolecular charge dynamics in CN, and presents a promising approach to the oxytetracycline degradation and H2O2 production.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.118970