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Unraveling Minimum Active Units and Substrate Activation for Carbon Nitride in Photocatalytic Oxidation Reactions

preprint
submitted on 20.04.2020 and posted on 23.04.2020 by Chaofeng Huang, Yaping Wen, Dandan Dong, Yanfei Shen, Songqin Liu, Haibo Ma, Yuanjian Zhang

Covalent bonded carbon nitride (CN) has stimulated extensive attentions from photosynthesis to optoelectronics. However, the acquisition of correct numbers beyond stoichiometry and composition remains indefinable. Moreover, the electronic coupling by the substrates to the photoexcitation processes in value-added oxidation reactions is essential, but still poorly understood. Herein, we report by far the minimum active structure of CN by constructing fragments consisting of melem (M1) and its incomplete condensed form with cyanide termination (M2). Surprisingly, such configuration endowed a boosted activity of 11 times of traditional bulk CN in photocatalytic oxidation of tetracycline as a showcase application of water cleaning and sanitation. The mechanism studies disclosed that M1 and M2 were primarily responsible for light absorption and charge separation, respectively; meanwhile the electronic coupling by the O2 substrate participated the photoexcited processes thus synergistically enhanced the photocatalytic reactions.

History

Email Address of Submitting Author

Yuanjian.Zhang@seu.edu.cn

Institution

Southeast University

Country

China

ORCID For Submitting Author

0000-0003-2932-4159

Declaration of Conflict of Interest

No conflict of interest

Version Notes

V1-2020-04-20

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