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Enhanced visible light-driven photodegradation of tetracycline by salicylic acid-modified graphitic carbon nitride and toxicity assessment

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Abstract

The tetracycline (TC) in water has led to serious concern. Graphitic carbon nitride (g-C3N4) photocatalysts were produced via copolymerization of mono-benzene ring-mediated precursors (urea, melamine, and dicyandiamide) involving salicylic acid (SA) for TC degradation. The SA-modified g-C3N4 samples showed improved visible light absorbance, transfer and separation of photogenerated electrons, and prospective photocatalytic application in TC degradation. As a result, the optimal SA-modified g-C3N4 (2 wt% of SA) using urea (CNU-SA-2) showed 2 times higher TC degradation than that of pristine g-C3N4. The process of TC degradation was evaluated by the reduction of antibacterial activity and extensively studied by varying the types of TC, initial pH values, co-existing anions, and natural organic materials. In addition, the catalyst could be reused for at least four cycles, indicating good reusability. The main active species were revealed to be h+ and ·O2 by scavenging experiments and electron spin resonance. The CNU-SA-2 photocatalyst and TC intermediates during degradation had no adverse impact on zebrafish embryos. This work could provide a design strategy and a perspective on the practical application of g-C3N4-based photocatalysts for the treatment of wastewater containing antibiotics.

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All data generated or analyzed during the current work are included in this published article and its supplementary information files.

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Funding

This work has received the finical support from the National Natural Science Foundation of China (No. 21777116) and the Fundamental Research Funds for the Central Universities.

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Contributions

Mengmeng Chen: conceptualization, data curation, investigation, methodology, writing—review and editing. Mengxue Li: writing—review and editing. Peng Li: writing—review and editing. Stephanie Ling Jie Lee: writing—review and editing. Juanjuan Tang: data curation. Qian Li: data curation. Sijie Lin: project design, supervision, writing—review and editing, project administration, funding acquisition.

Corresponding authors

Correspondence to Mengxue Li or Sijie Lin.

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All animal tests were in accordance with the current Chinese legislation and the Animal Ethics Committee at Tongji University.

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The authors declare no competing interests.

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Responsible Editor: Sami Rtimi

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Chen, M., Li, M., Li, P. et al. Enhanced visible light-driven photodegradation of tetracycline by salicylic acid-modified graphitic carbon nitride and toxicity assessment. Environ Sci Pollut Res 29, 90768–90778 (2022). https://doi.org/10.1007/s11356-022-22000-4

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