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Adsorption Dynamics of Atrazine on realistic Polystyrene Nanoplastics: Insights into Co-Contamination Risks
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Researchers studied how atrazine herbicide adsorbs onto realistic, irregularly shaped polystyrene nanoplastics rather than idealized spherical particles, using computational and experimental methods. Irregular NPs showed different adsorption dynamics than spherical models, suggesting that shape-based differences in surface area and functional group exposure are important for understanding co-contamination risks in realistic environmental conditions.
After their disposal, single-use plastic products end up in environments and start withering, eventually breaking down into Nanoplastics (NPs). This has become an emerging environmental concern. Unsupervised disposal has caused their entry into groundwater and eventually reaches the human body through the food chain, causing health risks. There is a significant research gap in studying realistic NPs that are non-spherical NP particles. A lab produced NPs suspensions prepared for the experiments. The NPs in groundwater act as a vector for other contaminants, such as atrazine, which is widely used as herbicide. The environmental persistence of atrazine can cause soil and water contamination due to its hydrophobic nature and its tendency to adsorb onto particulate matter, including nanoparticles, making it ideal for getting transported by NPs in the groundwater. Hence, it is essential to study its adsorption dynamics and ecological impacts in the presence of NPs derived from single-use plastic products such as polystyrene nanoplastics (PSNP). This study aims to understand the adsorption of atrazine by realistic PSNPs and the environmental risks posed by pesticide and nanoplastic co-contamination. Adsorption studies of PSNPs and atrazine were done varying different parameters like contact time, the concentration of atrazine, and NP, salinity and pH. Adsorption of atrazine was found highest for the highest concentration of NPs. Salinity increased the adsorption of atrazine onto PSMPs. The study helped to conclude that the adsorption of atrazine onto realistic NPs is possible.
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Researchers analyzed how particle shape and surface structure affect the adsorption properties of polystyrene microplastics toward organic pollutants, reviewing experimental literature to disentangle the influence of surface layer morphology from bulk particle characteristics. The study found that surface porosity and roughness significantly modify adsorption capacity and kinetics, cautioning that results from idealized model spheres may not accurately represent the behavior of environmentally aged or irregularly shaped microplastic particles.
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This review analyzed atrazine adsorption onto different microplastic types in aqueous solution, examining how varying environmental conditions and physicochemical properties of PE and other MP matrices govern the sorption and transport of this ubiquitous herbicide when MPs serve as contaminant vectors in aquatic systems.
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Researchers used molecular simulations to show that benzo(a)pyrene adsorbed onto polystyrene nanoplastics alters how the particles interact with and penetrate phospholipid membranes, suggesting that pollutant-coated nanoplastics may pose different biological risks than pristine ones.
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Researchers systematically explored how the pesticide atrazine adsorbs onto both pristine and aged microplastics in aquatic environments. The study found that aged microplastics had higher adsorption capacities than pristine ones, with the aging process and pH significantly affecting surface charge and adsorption behavior, suggesting that weathered microplastics may carry greater loads of chemical contaminants.
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