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Microplastic properties and their interaction with hydrophobic organic contaminants: a review

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Abstract

Microplastics (MPs) have been defined as particles of size < 5 mm and are characterized by hydrophobicity and large surface areas. MPs interact with co-occurring hydrophobic organic contaminants (HOCs) via sorption–desorption processes in aquatic and terrestrial environments. Ingestion of MPs by living organisms may increase exposure to HOC levels. The key mechanisms for the sorption of HOCs onto MPs are hydrophobic interaction, electrostatic interaction, π–π interactions, hydrogen bonding, and Van der Waals forces (vdW). Polymer type, UV-light-induced surface modifications, and the formation of oxygen-containing functional groups have a greater influence on electrostatic and hydrogen bonding interactions. In contrast, the formation of oxygen-containing functional groups negatively influences hydrophobic interaction. MP characteristics such as crystallinity, weathering, and surface morphology affect sorption capacity. Matrix properties such as pH, ionic strength, and dissolved organic matter (DOM) also influence sorption capacity by exerting synergistic/antagonistic effects. We reviewed the mechanisms of HOC sorption onto MPs and the polymer and matrix properties that influence the HOC sorption. Knowledge gaps and future research directions are outlined.

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All data referred to or contained in this review are publically available.

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Acknowledgements

The authors thank the Director, CSIR-NEERI for granting permission to publish the paper.

The authors are grateful to our all-laboratory colleagues and research staff for their constructive advice and help.

Funding

This work was funded by CSIR-National Environmental Engineering Research Institute, Nagpur (MLP-145).

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AP and ARK conceptualized the topic and were substantially contributed to the conception and design of the article and interpreting the relevant literature. AP drafted the article and wrote the manuscript with input from all the authors. ARK and ANV verified and revised it critically. All authors discussed the results and contributed to the final version of the manuscript.

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Correspondence to Asirvatham Ramesh Kumar.

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The authors declare no competing interests.

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Prajapati, A., Narayan Vaidya, A. & Kumar, A.R. Microplastic properties and their interaction with hydrophobic organic contaminants: a review. Environ Sci Pollut Res 29, 49490–49512 (2022). https://doi.org/10.1007/s11356-022-20723-y

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  • DOI: https://doi.org/10.1007/s11356-022-20723-y

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