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Adsorption of triclosan onto different aged polypropylene microplastics: Critical effect of cations
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This study examined how sodium and calcium ions in water influence the adsorption of triclosan onto aged polypropylene microplastics, finding that cation type and concentration altered sorption behavior through electrostatic interactions. The results have implications for understanding how microplastics transport antimicrobial contaminants in natural water systems.
Adsorption of organic contaminants onto aged microplastics (MPs) may be important in understanding their transport potential and ecological risks in aquatic environment. Cations of Na and Ca are common electrolytes in water, which can greatly influence the adsorption behavior of MPs by impacting the electrostatic interaction between MPs and organic contaminants. The results of this study showed that aged isotactic polypropylene (iPP) MPs exhibited higher adsorption capacity to triclosan (TCS) than pristine ones, and the sorption affinity was enhanced with the increase of ionic concentrations. The crucial influence of cations on the adsorption behavior of aged MPs mainly depended on the changed properties of TCS and interactions between MPs and TCS. Salting out effect induced the precipitation of TCS from water and facilitated the partition of TCS onto MPs in high salinity water. Besides, compressing electrostatic double layer of MPs via squeezing out effect and bridging effect between functional groups of aged MPs and contaminants may also be significant factors in the sorption process. These findings will be helpful for understanding the role of cations on the transport of pollutants, the fate of MPs and their associated environmental risks in aquatic ecosystems.
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Researchers investigated how environmental aging processes change the ability of polyethylene, polypropylene, and polystyrene microplastics to absorb the antimicrobial compound triclosan. They found that aging increased sorption capacity for polyethylene but decreased it for polypropylene, with polystyrene showing mixed results depending on the aging method. The changes were driven by modifications to surface chemistry, particularly the introduction of oxygen-containing functional groups that alter hydrophobic and electrostatic interactions.
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Researchers characterized how the antimicrobial compound triclosan adsorbs onto polystyrene microplastics, finding that sorption is driven primarily by hydrophobic interactions and is highest at acidic pH, while temperature, ionic strength, and co-occurring heavy metals had little effect — suggesting polystyrene acts as an environmental carrier for triclosan.
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Researchers examined how triclosan, an antimicrobial compound common in personal care products, adsorbs onto polystyrene nanoplastics of different sizes and surface chemistries, finding that smaller particles and functionalized surfaces (with carboxyl or amine groups) bind more triclosan, with pH and salinity further modulating uptake — suggesting nanoplastics can serve as mobile carriers for this contaminant.
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