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61,005 resultsShowing papers similar to Ligand-selective complexation of natural organic matter with Mg2+ modulates nanoplastic transport in seawater-saturated porous media
ClearImpact of different modes of adsorption of natural organic matter on the environmental fate of nanoplastics
Natural organic matter in water can stabilize nanoplastics by coating their surfaces and preventing them from clumping together and settling out, with different types of organic matter working through different physical mechanisms. Understanding this stabilization effect is important for predicting how long nanoplastics remain suspended in aquatic environments.
Heteroaggregation of nanoplastic particles in the presence of inorganic colloids and natural organic matter
Nanoplastics were found to heteroaggregate extensively with inorganic colloids and natural organic matter in both freshwater and marine conditions, altering their size, surface charge, and settling behavior compared to pristine particles. The study demonstrates that nanoplastic behavior in natural waters is dominated by interactions with other environmental constituents rather than the intrinsic properties of the plastic alone.
Natural Organic Matter Stabilizes Pristine Nanoplastics but Destabilizes Photochemical Weathered Nanoplastics in Monovalent Electrolyte Solutions
This study examined how sunlight weathering and natural organic matter coatings change the behavior of nanoplastics in water. Researchers found that organic matter stabilizes fresh nanoplastics but actually destabilizes sun-weathered ones, meaning aged nanoplastics in natural waters may clump together and settle differently than expected, affecting where they end up in aquatic environments.
Agglomeration of nano- and microplastic particles in seawater by autochthonous and de novo-produced sources of exopolymeric substances
Nano- and microplastic particles in seawater were found to readily form agglomerates with naturally produced exopolymeric substances, altering their surface properties, size, and sinking behavior compared to pristine particles. The study demonstrates that natural organic matter in seawater fundamentally changes how plastic particles behave and interact with marine organisms and sediments.
Algae polysaccharide-induced transport transformation of nanoplastics in seawater-saturated porous media
Researchers examined how three types of algae polysaccharides affect the aggregation and transport of nanoplastics through seawater-saturated sand. They found that coating nanoplastics with these natural compounds dramatically changed their mobility, with sodium alginate and fucoidan reducing aggregation and increasing transport through the porous media. The study suggests that naturally occurring algae compounds in marine environments may significantly influence where nanoplastics end up.
Mechanistic understanding of the aggregation kinetics of nanoplastics in marine environments: Comparing synthetic and natural water matrices
Researchers investigated aggregation kinetics of polystyrene nanoplastics in marine environments, finding that organic matter type and salt concentration strongly influenced particle stability, with nanoplastics in natural seawater aggregating differently than in synthetic matrices.
Further research on the impacts of humic acid in the aggregation of nanoplastics: The roles of molecular weight and surface functionalization
Researchers studied how humic acid — a natural compound found in soil and water — coats nanoplastic particles and changes how they clump together, finding that larger humic acid molecules create thicker coatings that keep nanoplastics suspended and dispersed rather than settling. This matters because dispersed nanoplastics travel farther through water systems and are more likely to be ingested by organisms.
Heteroaggregation, disaggregation, and migration of nanoplastics with nanosized activated carbon in aquatic environments: Effects of particle property, water chemistry, and hydrodynamic condition
Researchers studied how nanosized activated carbon interacts with positively and negatively charged nanoplastics under various water chemistry and hydrodynamic conditions. They found that aggregation behavior depended strongly on particle charge, pH, and the presence of natural organic matter like humic acid. The study suggests that interactions with engineered nanomaterials in aquatic environments can significantly influence how far nanoplastics travel, with implications for predicting their environmental fate.
Fate and transport of nanoplastics in complex natural aquifer media: Effect of particle size and surface functionalization
Researchers used batch and column experiments in a natural sandy aquifer to show that nanoplastic transport is governed primarily by organic matter coatings rather than particle size or surface chemistry alone, with suspended organic matter increasing mobility while dissolved organic matter reduces it — findings that improve predictions of nanoplastic contamination in agricultural groundwater systems.
Combined effects of photoaging and natural organic matter on the colloidal stability of nanoplastics in aquatic environments
Researchers found that photoaging of polystyrene nanoplastics alters how natural organic matter interacts with their surfaces — reducing humic acid adsorption while increasing protein adsorption — with downstream effects on the nanoplastics' stability and transport in aquatic environments.
Transport and deposition of microplastic particles in saturated porous media: Co-effects of clay particles and natural organic matter
Researchers performed column experiments to study how clay particles and natural organic matter affect microplastic transport through saturated porous media, finding that both colloids reduced MP mobility through heteroaggregation and that their combined presence produced the greatest reduction in transport.
Nanoplastics as carriers of organic pollutants in seawater-saturated porous media: a quantitative comparison of transport pathways
Researchers quantitatively compared transport pathways of non-polar organic pollutants carried by nanoplastics through seawater-saturated porous media, demonstrating that the carrier effect of nanoplastics is the primary mechanism inhibiting pollutant migration and enabling their co-transport in coastal and marine subsurface environments.
Molecular modeling to elucidate the dynamic interaction process and aggregation mechanism between natural organic matters and nanoplastics
Researchers used molecular modeling to understand how nanoplastics interact with natural organic matter found in water environments. They found that the chemical properties of both the plastic surface and the organic molecules determined whether they clumped together or remained dispersed. The study provides new molecular-level insights into how nanoplastics behave and spread in natural water systems, which is important for predicting their environmental fate.
Influence of environmental and biological macromolecules on aggregation kinetics of nanoplastics in aquatic systems
Researchers studied how natural macromolecules like humic acid, alginate, and proteins influence the clumping behavior of polystyrene nanoplastics in water. They found that these macromolecules generally stabilized nanoplastics in sodium chloride solutions but caused them to aggregate in calcium chloride solutions, with effects varying by pH. The findings suggest that the environmental fate and transport of nanoplastics in natural waters depends heavily on the surrounding organic molecules and water chemistry.
Combined effects of particle size and humic acid corona on the aggregation kinetics of nanoplastics in aquatic environments
Researchers examined how humic acid coating and nanoplastic particle size interact to govern aggregation behavior, finding that while humic acid generally inhibits clumping in freshwater, calcium ions cause the coating on larger particles (100–200 nm) to promote aggregation through bridging — a size-dependent mechanism not seen in the smallest 40 nm particles tested.
Heteroaggregation kinetics of oppositely charged nanoplastics in aquatic environments: Effects of particle ratio, solution chemistry, and interaction sequence
Researchers investigated how oppositely charged nanoplastics clump together (heteroaggregation) in water under varying pH, salt, and natural organic matter conditions, finding that electrostatic attraction drives aggregation but humic acid retards it more than sodium alginate, while the sequence and timing of chemical interactions also significantly alters the final aggregation behavior.
The selective occurrence of ripening effect makes the cotransport of various sized nanoplastics in seawater-saturated and freshwater-saturated porous media significantly different
Researchers investigated how nanoplastics of different sizes co-transport through freshwater versus seawater-saturated porous media, finding that in seawater a "ripening" effect — where deposited particles make surfaces stickier — causes nanoplastics to mutually enhance each other's retention, producing fundamentally different fate patterns than in freshwater.
The impact of nanoplastics on marine dissolved organic matter assembly
Researchers found that even trace concentrations of nanoplastics (10 ppb) significantly accelerate the spontaneous assembly of dissolved organic matter into particles in seawater, driven by hydrophobic interactions — a finding that could have far-reaching consequences for the ocean's largest carbon pool.
Sediment organic carbon dominates the heteroaggregation of suspended sediment and nanoplastics in natural and surfactant-polluted aquatic environments
Researchers found that sediment organic carbon plays a dominant role in the heteroaggregation of nanoplastics with suspended sediment particles, with surfactant pollution altering aggregation dynamics and influencing the environmental transport and fate of nanoplastics in aquatic systems.
Exposure Order to Photoaging and Humic Acids Significantly Modifies the Aggregation and Transformation of Nanoplastics in Aqueous Solutions
Researchers discovered that the order in which nanoplastics are exposed to sunlight and natural organic matter significantly changes how they clump together and behave in water. Nanoplastics aged by sunlight before encountering humic acids behaved differently than those exposed in the reverse order. This finding is important for predicting how nanoplastics actually move and persist in real-world water environments.
Eco-Corona Dictates Mobility of Nanoplastics in Saturated Porous Media: The Critical Role of Preferential Binding of Macromolecules
The eco-corona that forms on nanoplastic surfaces through interaction with humic substances and extracellular polymeric substances (EPS) was found to critically determine nanoplastic mobility through saturated porous media. Humic-coated nanoplastics showed greater mobility than EPS-coated ones, suggesting natural organic matter composition governs nanoplastic transport in groundwater systems.
Novel measurement method of determining PS nanoplastic concentration via AuNPs aggregation with NaCl
Researchers examined how salinity and dissolved organic matter affect the aggregation and sedimentation of polystyrene nanoplastics in estuarine water, finding that higher salinity and humic acid promoted particle aggregation and accelerated settling. These dynamics influence the fate and bioavailability of nanoplastics in coastal environments.
Transport of polystyrene nanoplastics in porous media: Combined effects of two co-existing substances
Researchers studied how cationic and anionic surfactants interact with natural organic matter (humic acid and sodium alginate) to control polystyrene nanoplastic transport through porous media, finding that the dominant mobility mechanism switched from electrostatic (with cationic surfactants) to hydrophobic (with anionic surfactants), with organic matter amplifying each surfactant's effect.
The effects of organic and inorganic colloids on the aggregation and settling of polystyrene (PS) nanoplastics in mimicked ocean temperature conditions
Researchers studied how naturally occurring minerals and biological compounds affect the clumping and sinking behavior of nanoplastics in ocean-like conditions. They found that clay minerals caused up to 70% of nanoplastics to settle out of the water at warm temperatures, but certain biological polymers produced by marine organisms could block this process entirely, keeping the plastics suspended. These findings matter because they help explain why nanoplastics may persist in surface waters rather than sinking to the ocean floor.