A Perspective on Algae-Derived Dissolved Organic Matter and its Dynamic Influence on Nanoplastic Aggregation in Eutrophic Waters

Abstract

The aggregation behavior of nanoplastics (NPs) is crucial in determining their fate in aquatic environments. Dissolved organic matter (DOM), characterized by its complex molecular structure and diverse functional groups, can spontaneously absorb on the surface of NPs, thus altering their colloidal stability. In eutrophic waters, DOM primarily originates from metabolic byproducts released by phytoplankton, and its molecular composition and hydrophilic properties change dynamically as the progression of algal blooms. This perspective aims to summarize the heterogeneity of DOM during the initiation, outbreak and recession of algal blooms. And we investigates the influence of molecular-level variations in DOM composition on the aggregation behavior of NPs. Additionally, this study provides microscopic insights into the underlying mechanisms relating to the interfacial interactions between DOM and NPs. It finally addresses the challenges and future directions, emphasizing the need for comprehensive studies to understand the fate of NPs in eutrophic waters.

Keywords: Nanoplastics, Algae-derived dissolved organic matter, interfacial interaction, Aggregation behavior, algal blooms