Cation-Π Mechanism Promotes the Adsorption of Humic Acid on Polystyrene Nanoplastics: Evidence from Experimental Characterization and Dft Calculation

Cation-π mechanism promotes the adsorption of humic acid on polystyrene nanoplastics to differently affect their aggregation: Evidence from experimental characterization and DFT calculation

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Researchers investigated how humic acid and metal ions in natural lake water affect the clumping behavior of polystyrene nanoplastics, finding that a cation-π bonding mechanism — where metal ions bridge humic acid molecules onto the nanoplastic surface — governs whether particles aggregate or remain dispersed, with major implications for their environmental persistence and toxicity.

Adsorption of typical natural organic matter on microplastics in aqueous solution: Kinetics, isotherm, influence factors and mechanism

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Researchers investigated humic acid adsorption onto PVC and PS microplastics, finding that pH, ion species, particle size, and surfactants significantly influenced adsorption capacity through mechanisms including halogen bonding, hydrogen bonding, and pi-pi interactions.

Studying the adsorption mechanisms of nanoplastics on covalent organic frameworks via molecular dynamics simulations

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Scientists used computer simulations to test whether special sponge-like materials called covalent organic frameworks (COFs) can trap nanoplastics, tiny plastic particles too small to see that come from everyday items like water bottles and food packaging. They found one particular COF design (called TpPa-OH) was best at grabbing onto these plastic particles, thanks to both sticky molecular attractions and electrical charge effects. This is early-stage research, but it could eventually lead to better filters for removing nanoplastics from water, which matters since these particles are increasingly found in our bodies and their health effects are still being studied.

Adsorption behavior and quantum chemical analysis of surface functionalized polystyrene nano-plastics on gatifloxacin.

Interfacial interactions of humic acids with polystyrene nano-plastics in aqueous/ionic environments: a molecular dynamics exploration

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Researchers used molecular dynamics simulations to investigate how humic acid molecules interact with carboxylated polystyrene nanoplastics in water, finding that humic substances form an eco-corona on the nanoplastic surface that alters its environmental behavior and potential toxicity.