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Enhanced biotoxicity by co-exposure of aged polystyrene and ciprofloxacin: the adsorption and its influence factors

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Abstract

Microplastics (MPs), as emerging contaminants, usually experience aging processes in natural environments and further affect their interactions with coexisted contaminants, resulting in unpredictable ecological risks. Herein, the effect of MPs aging on their adsorption for coexisting antibiotics and their joint biotoxicity have been investigated. Results showed that the adsorption capacity of aged polystyrene (PS, 100 d and 50 d) for ciprofloxacin (CIP) was 1.10–4.09 times higher than virgin PS due to the larger BET surface area and increased oxygen-containing functional groups of aged PS. Following the increased adsorption capacity of aged PS, the joint toxicity of aged PS and CIP to Shewanella Oneidensis MR-1 (MR-1) was 1.03–1.34 times higher than virgin PS and CIP. Combined with the adsorption process, CIP posed higher toxicity to MR-1 compared to aged PS due to the rapid adsorption of aged PS for CIP in the first 12 h. After that, the adsorption process tended to be gentle and hence the joint toxicity to MR-1 was gradually dominated by aged PS. A similar transformation between the adsorption rate and the joint toxicity of PS and CIP was observed under different conditions. This study supplied a novel perception of the synergistic effects of PS aging and CIP on ecological health.

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The authors declare that the data supporting the findings of this study are available within the paper and its Supplementary Information files. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors gratefully acknowledge support of this work by the Shandong Provincial Natural Science Foundation (No. ZR2022QB167); the National Natural Science Foundation of China (No. 21976185); and the National Natural Science Foundation of China (No. 42377396).

Funding

The authors gratefully acknowledge support of this work by the Shandong Provincial Natural Science Foundation (No. ZR2022QB167); the National Natural Science Foundation of China (No. 21976185); and the National Natural Science Foundation of China (No. 42377396).

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All authors contributed to the study conception and design: Tongtong Li: Writing—Original Draft. Jing Lan: Investigation. Yaoyao Wang: Interpretation. Lulu Sun: Validation. Yaru Li and Zongshan Zhao: Writing—Review and Editing.

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Correspondence to Yaru Li or Zongshan Zhao.

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Li, T., Lan, J., Wang, Y. et al. Enhanced biotoxicity by co-exposure of aged polystyrene and ciprofloxacin: the adsorption and its influence factors. Environ Geochem Health 46, 185 (2024). https://doi.org/10.1007/s10653-024-01961-0

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  • DOI: https://doi.org/10.1007/s10653-024-01961-0

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