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Investigation of the adsorption–desorption behavior of antibiotics by polybutylene succinate and polypropylene aged in different water conditions

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Abstract

Microplastics (MPs) are widely present in aqueous environments and aged by natural components of complex water environments, such as salinity (SI) and dissolved organic matter (DOM). However, the effects of multicondition aging on the physicochemical properties and environmental behavior of MPs have not been completely investigated. In this study, the degradable MP polybutylene succinate (PBS) was used to investigate the environmental behavior of sulfamethoxazole (SMZ) and was compared with polypropylene (PP). The results showed that the single-factor conditions of DOM and SI, particularly DOM, promoted the aging process of MPs more significantly, especially for PBS. The degrees of MP aging under multiple conditions were lower than those under single-factor conditions. Compared with PP, PBS had greater specific surface area, crystallinity, and hydrophilicity and thus a stronger SMZ adsorption capacity. The adsorption behavior of MPs fitted well with the pseudo-second-order kinetic and Freundlich isotherm models, indicating multilayer adsorption. Compared with PP, PBS showed relatively a higher adsorption capacity, for example, for MPs aged under DOM conditions, the adsorption of SMZ by PBS was up to 5.74 mg/g, whereas that for PP was only 3.41 mg/g. The desorption experiments showed that the desorption amount of SMZ on MPs in the simulated intestinal fluid was greater than that in Milli-Q water. In addition, both the original PBS and the aged PBS had stronger desorption capacities than that of PP. The desorption quantity of PBS was 1.23–1.84 times greater than PP, whereas the desorption rates were not significantly different. This experiment provides a theoretical basis for assessing the ecological risks of degradable MPs in complex water conditions.

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

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Acknowledgements

The authors would like to thank the Shiyanjia Lab (www.shiyanjia.com) for the HPLC analysis.

Funding

This work was supported by the National Natural Science Foundation of China [grant numbers 52000153], the Natural Science Foundation of the Jiangsu Higher Education Institutions of China [grant number 22KJA610005], and the Jiangsu Association for Science and Technology Young Scientific and Technological Talents Project [grant number TJ-2021–06], the Water Conservancy Technology Project of Jiangsu Province [grant number 2021077], and the Xuzhou Key Research and Development Plan Project (social development) [grant number KC20163]. Meanwhile, they had no involvement in study design; in the collection, analysis, and interpretation of data; in the writing of the report; and in the decision to submit the article for publication.

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Xiulei Fan: conceptualization, resources, writing—review & editing, supervision, funding acquisition. Weiyi Li: data curation, conceptualization, methodology, validation, formal analysis, investigation, resources, writing—review & editing. Easar Alam: conceptualization, methodology, validation, formal analysis, investigation, resources, data curation, visualization, writing—review & editing, supervision, project administration, funding acquisition. Binwen Cao: writing—review & editing. Shenwen Qian: writing—review & editing. Shang Shi: writing—review & editing. Yangyang Yang: writing—review & editing.

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Correspondence to Xiulei Fan.

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Fan, X., Li, W., Alam, E. et al. Investigation of the adsorption–desorption behavior of antibiotics by polybutylene succinate and polypropylene aged in different water conditions. Environ Sci Pollut Res 30, 36619–36630 (2023). https://doi.org/10.1007/s11356-022-24693-z

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  • DOI: https://doi.org/10.1007/s11356-022-24693-z

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