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1,3,5-Benzenetriyl substituted g-C3N4 for enhanced visible light photocatalytic activity

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Abstract

1,3,5-Benzenetriyl substituted g-C3N4 (BTCN) was prepared by copolymerizing dicyandiamide with 1,3,5-benzenetricarbonitrile, in which the bridge N3C of g-C3N4 was substituted by the benzene moiety. A larger π conjunction system thus forms between the benzene and the tri-s-triazine moieties. BTCN exhibits a narrowed band gap, obvious visible light absorption, and a promoted photogenerated charge separation. The visible light photocatalytic degradation rate of AO7 with 0.5% benzene substituted g-C3N4 is about 3.8 times higher than that with primary g-C3N4. The 0.5%BTCN exhibits excellent photostability for the cyclic photocatalytic degradation of AO7. The substitution of N2C and NC was also carried out by using isophthalonitrile and benzonitrile as the copolymerized precursors, respectively, which however show relatively weaker promotions to the photocatalytic performance of g-C3N4 than the substitution of N3C with 1,3,5-benzenetriyl.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21677049, 21876051).

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Correspondence to Feng Chen.

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Liang, Y., Sun, N., Zang, C. et al. 1,3,5-Benzenetriyl substituted g-C3N4 for enhanced visible light photocatalytic activity. Res Chem Intermed 45, 3641–3654 (2019). https://doi.org/10.1007/s11164-018-03718-8

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