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Sorption Behavior and Mechanisms of Organic Contaminants to Nano and Microplastics
Summary
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.