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Carbon dots anchored high-crystalline g-C3N4 as a metal-free composite photocatalyst for boosted photocatalytic degradation of tetracycline under visible light

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Abstract

Photocatalysts with excellent performance, low cost and innocuity are highly desired for environmental remediation. Zero-dimensional carbon dots with a size of 2–10 nm represent a class of promising co-catalysts due to their excellent photo-induced electron transfer, increased light absorption and thus boosted photocatalytic activity. Herein, carbon dots/high-crystalline g-C3N4 (CDs/H-CN) composites were successfully prepared via a facile calcination method for the degradation of tetracycline (TC) under visible light irradiation. Experimental results reveal that the CDs/H-CN-1 composite displays the optimal photocatalytic degradation of TC (86%, 120 min), and exhibits remarkable photostability (no decrease after 4 cycles of reaction within 480 min). According to the identification of intermediates by liquid chromatography-mass spectrometry (LC–MS) analysis, the degradation pathways of TC were proposed. In addition, the planting experiment of mung beans was performed to further confirm the biotoxicity of TC degraded products. This work underlines the importance of co-catalyst and presents a feasible protocol for the rational construction of H-CN-based photocatalysts for various photocatalytic applications.

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Acknowledgements

The authors would like to acknowledge the founding support from the National Natural Science Foundation of China (Nos. 21906072, 22006057 and 31971616), the Natural Science Foundation of Jiangsu Province (BK20190982), “Doctor of Mass entrepreneurship and innovation” Project in Jiangsu Province, Doctoral Scientific Research Foundation of Jiangsu University of Science and Technology (China) (1062931806 and 1142931803), the Science and Technology Innovation Development Plan of Jilin City (201830811), Science Development Project of Jilin City (20190104056), the Natural Science Foundation Project of Jilin Provincial Science and Technology Development Plan (20190201277JC), the Science and Technology Research Project of the Department of Education of Jilin Province (JJKH20200039KJ) and the Science and Technology Research Project of Jilin City (20190104120).

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  1. Weilong Shi and Shuang Yang have contributed equally to this work.

Authors and Affiliations

  1. School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, PR China

    Weilong Shi

  2. School of Material Science and Engineering, Beihua University, Jilin, 132013, PR China

    Shuang Yang, Jingbo Wang, Xue Lin & Junyou Shi

  3. School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu, PR China

    Haoran Sun & Feng Guo

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  1. Weilong Shi
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Shi, W., Yang, S., Sun, H. et al. Carbon dots anchored high-crystalline g-C3N4 as a metal-free composite photocatalyst for boosted photocatalytic degradation of tetracycline under visible light. J Mater Sci 56, 2226–2240 (2021). https://doi.org/10.1007/s10853-020-05436-2

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