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The Influence of Organic Acids with Different Functional Groups on the Transport of Nanoplastics in Manganese Oxide-Coated Saturated Porous Media: Coupling Effect of Structural Heterogeneity and Solution Chemistry
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This study examined microbial community composition and function in plastic bioremediation systems, characterizing the bacteria and fungi most active in degrading various polymer substrates under engineered or natural conditions. The findings identify key microbial players and metabolic pathways relevant to developing effective plastic bioremediation strategies.
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Relevance of Iron Oxyhydroxide and Pore Water Chemistry on the Mobility of Nanoplastic Particles in Water-Saturated Porous Media Environments
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Laboratory column experiments showed that iron oxyhydroxide surface charge in porous media is a primary control on nanoplastic mobility, with positively charged surfaces trapping negatively charged polystyrene nanoparticles and negatively charged surfaces allowing free transport. Understanding these transport mechanisms in aquifers and sediments is essential for predicting how long nanoplastics persist and where they accumulate in groundwater environments.
Combined Effects of Fe/Al Oxyhydroxide Coating and pH on Polystyrene Nanoplastic Transport in Saturated Sand Media
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Researchers found that soil pH and iron or aluminum mineral coatings on sand grains strongly control how far nanoplastics travel through the ground, with acidic, mineral-rich conditions trapping particles more effectively — findings that could help predict nanoplastic contamination of groundwater.
Transport of Nanoplastics in Saturated Zeolite: Effects of Flow Rate and Hydro-Chemical Conditions
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Column experiments showed that zeolite — a mineral common in natural soils — retains polystyrene nanoplastics through electrostatic attraction and physical straining, with retention decreasing at higher pore-water flow rates. Understanding how soil mineralogy and hydrology jointly govern nanoplastic transport is fundamental to predicting where these particles accumulate in the environment and how likely they are to reach groundwater and food-crop root zones.
Toward Understanding the Transport of Nanoplastics in Subsurface Pores
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Researchers used quartz crystal microbalance experiments to measure how nanoplastics with different surface charges adsorb onto mineral surfaces in soils and groundwater, finding that surface charge compatibility between particles and mineral oxides strongly governs transport behavior. Ionic strength and humic acid also significantly modulated nanoplastic adsorption, providing key parameters for modeling their subsurface fate.
Transport of nanoplastics in saturated porous media: Synergy of particle size, surface functional groups, and low molecular weight organic acids
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Researchers systematically tested how particle size and surface functional groups interact with low-molecular-weight organic acids to control nanoplastic mobility through saturated sand columns, finding that carboxyl-coated particles became less mobile as size increased while amine-coated particles became more mobile, with citric acid providing stronger steric hindrance than lactic acid.
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