Abstract
Microplastics (MPs) migrate by adsorbing heavy metals in aquatic environments and act as their carriers. However, the aging mechanisms of MPs in the environment and the interactions between MPs and heavy metals in aquatic environments require further study. In this study, two kinds of materials, polyamide (PA) and polylactic acid (PLA) were used as target MPs, and the effects of UV irradiation on the physical and chemical properties of the MPs and the adsorption behavior of Cu(II) were investigated. The results showed that after UV irradiation, pits, folds and pores appeared on the surface of aged MPs, the specific surface area (SSA) increased, the content of oxygen-containing functional groups increased, and the crystallinity decreased. These changes enhanced the adsorption capacity of aged MPs for Cu(II) pollutants. The adsorption behavior of the PA and PLA MPs for Cu(II) conformed to the pseudo-second-order model and Langmuir isotherm model, indicating that the monolayer chemical adsorption was dominant. The maximum amounts of aged PA and PLA reached 1.415 and 1.398 mg/g, respectively, which were 1.59 and 1.76 times of virgin MPs, respectively. The effects of pH and salinity on the adsorption of Cu(II) by the MPs were significant. Moreover, factors such as pH, salinity and dosage had significant effects on the adsorption of Cu(II) by MPs. Oxidative complexation between the oxygen-containing groups of the MPs and Cu(II) is an important adsorption mechanism. These findings reveal that the UV irradiation aging of MPs can enhance the adsorption of Cu(II) and increase their role as pollutant carriers, which is crucial for assessing the ecological risk of MPs and heavy metals coexisting in aquatic environments.
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Acknowledgements
The authors would like to thank all the reviewers who participated in the review and also thank to editage Editor (https://www.editage.com/) for its linguistic assistance during the preparation of this manuscript.
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This study was supported by National Natural Science Foundation of China (31270215) and Research Project of Hubei Provincial Department of Education (15Q119, and Q20131708).
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Chun Hu: conceptualization, investigation, data curation, writing-original draft, writing-review and editing, project administration, and funding acquisition; Yaodong Xiao: investigation, data curation, formal analysis, and writing-original draft; Qingrong Jiang: investigation, and data curation; Mengyao Wang: investigation, and writing-review and editing; Tingdan Xue: investigation and conceptualization.
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Hu, C., Xiao, Y., Jiang, Q. et al. Adsorption properties and mechanism of Cu(II) on virgin and aged microplastics in the aquatic environment. Environ Sci Pollut Res 31, 29434–29448 (2024). https://doi.org/10.1007/s11356-024-33131-1
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DOI: https://doi.org/10.1007/s11356-024-33131-1