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Adsorption behavior of organic pollutants on microplastics

Ecotoxicology and environmental safety, 2021-07, Vol.217, p.112207, Article 112207 [Peer Reviewed Journal]

2021 The Authors ;Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved. ;ISSN: 0147-6513 ;EISSN: 1090-2414 ;DOI: 10.1016/j.ecoenv.2021.112207 ;PMID: 33866287

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  • Title:
    Adsorption behavior of organic pollutants on microplastics
  • Author: Fu, Lina ; Li, Jing ; Wang, Guoyu ; Luan, Yaning ; Dai, Wei
  • Subjects: Adsorption ; Adsorption Mechanisms ; Influencing factors ; Microplastics ; Organic pollutants
  • Is Part Of: Ecotoxicology and environmental safety, 2021-07, Vol.217, p.112207, Article 112207
  • Description: Microplastics (MPs) are emerging pollutants that act as a carrier of toxic pollutants, release toxic substances, and aggregate in biota. The adsorption behavior of MPs has recently become a research hot spot. The objective of this study was to summarize the main mechanisms by which MPs adsorb organic pollutants, introduce some mathematical models commonly used to study the adsorption behavior of MPs, and discuss the factors affecting the adsorption capacity from three perspectives, i.e., the properties of MPs and organic pollutants, and environmental factors. Adsorption kinetics and isothermal adsorption models are commonly used to study the adsorption of organic pollutants on MPs. We observed that hydrophobic interaction is the most common mechanism by which MPs adsorb organic pollutants, and also reportedly controls the portion of organic pollutants. Additionally, electrostatic interaction and other non-covalent forces, such as hydrogen bonds, halogen bonds, and π–π interactions, are also mechanisms of organic pollutant adsorption on MPs. The particle size, specific surface area, aging degree, crystallinity, and polarity of MPs, and organic pollutant properties (hydrophobicity and dissociated forms) are key factors affecting adsorption capacity. Changes in the pH, temperature, and ionic strength also affect the adsorption capacity. Current research on the adsorption behavior of MPs has mainly been conducted in laboratories, and in-depth studies on the adsorption mechanism and influencing factors are limited. Therefore, studies on the adsorption behavior of MPs in the environment are required, and this study will contribute to a better understanding of this topic. [Display omitted] •This study reviews the mechanisms by which microplastics adsorb organic pollutants.•Factors affecting the adsorption capacity of microplastics are determined.•Microplastics adsorb organic pollutants mainly through hydrophobic interactions.•Microplastic and environmental properties affect adsorption of organic pollutants.
  • Publisher: Netherlands: Elsevier Inc
  • Language: English
  • Identifier: ISSN: 0147-6513
    EISSN: 1090-2414
    DOI: 10.1016/j.ecoenv.2021.112207
    PMID: 33866287
  • Source: DOAJ Directory of Open Access Journals
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