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Sorption Behavior and Mechanisms of Organic Contaminants to Nano and Microplastics
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This review summarizes the sorption mechanisms by which organic contaminants bind to nano and microplastics, including partitioning, surface sorption via hydrogen bonding and pi-pi interactions, and pore filling. Solution chemistry factors like pH, ionic strength, and dissolved organic matter all influence how strongly contaminants adsorb to plastic surfaces.
Nano and microplastics (NPs/MPs) have received widespread attention in recent years. Because of their large specific surface area and hydrophobicity, NPs/MPs can adsorb various organic contaminants. This article gives a brief review of the sorption behavior of organic contaminants to NPs/MPs, summarizes the possible sorption mechanisms, and analyzes the influencing factors in the environment on the sorption behavior and mechanisms of NPs/MPs. The main mechanisms of sorption of organic contaminants to NPs/MPs are partitioning, surface sorption (hydrogen bonding, π-π interaction, electrostatic interaction, and van der Waals force), and pore filling. The sorption behavior of organic contaminants to NPs/MPs is not only affected by the properties of the NPs/MPs and the organic contaminants, but also by the solution chemistry, such as the pH, ionic strength, and dissolved organic matter.
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