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61,005 resultsShowing papers similar to Heteroaggregation and sedimentation of natural goethite and artificial Fe3O4 nanoparticles with polystyrene nanoplastics in water
ClearThe heteroaggregation behavior of nanoplastics on goethite: Effects of surface functionalization and solution chemistry
Researchers investigated how polystyrene nanoplastics with different surface functional groups aggregate onto goethite (an iron oxide mineral) in water, finding that amine and carboxyl surface modifications substantially accelerated heteroaggregation through electrostatic and chemical bonding, with salinity promoting and high pH inhibiting the process.
Crystallinity- dependent heteroaggregation and co-sedimentation between polystyrene nanoplastics and iron (hydro)oxides
Researchers found that the crystallinity of iron (hydro)oxide minerals strongly governs their tendency to aggregate with polystyrene nanoplastics in water — higher crystallinity produces more positive surface charges, stronger electrostatic attraction, and greater hydrogen bonding with nanoplastics, ultimately controlling how and where these combined particles settle in aquatic environments.
Impact of iron/aluminum (hydr)oxide and clay minerals on heteroaggregation and transport of nanoplastics in aquatic environment
Researchers examined how polystyrene nanoplastics interact with nine different minerals in aquatic environments, finding that positively charged iron and aluminum (hydr)oxide minerals readily form aggregates with nanoplastics through electrostatic and hydrophobic forces, while humic acid and shifting pH significantly suppress this aggregation.
Comparative effects of crystalline, poorly crystalline and freshly formed iron oxides on the colloidal properties of polystyrene microplastics
Researchers found that freshly formed iron oxides caused the greatest aggregation of polystyrene microplastics in water, with effects decreasing in the order: freshly formed iron oxide > ferrihydrite > goethite > haematite. The findings suggest that iron oxide copresence can delay microplastic transport or alter their environmental fate depending on pH and crystallinity of the mineral.
Interaction of polystyrene nanoplastics with impurity-bearing ferrihydrite and implication on complex particle sedimentation
Researchers investigated how aluminum-, manganese-, and silicon-bearing iron mineral (ferrihydrite) impurities influence its aggregation with polystyrene nanoplastics in water, finding that aluminum impurities strengthened electrostatic attraction and increased aggregation while silicon and manganese impurities reduced it, with all aggregates showing slower sedimentation than pure ferrihydrite.
Influence of macromolecules and electrolytes on heteroaggregation kinetics of polystyrene nanoplastics and goethite nanoparticles in aquatic environments
Researchers studied how proteins, DNA, and humic acid affect the clumping of polystyrene nanoplastics with iron mineral particles in water, finding that at low concentrations all three macromolecules inhibit aggregation through steric hindrance — with proteins most effective — but that calcium ions can override this stabilization by bridging humic acid to particle surfaces.
Both nanoplastic and iron mineral types determine their heteroaggregation: Aggregation kinetics and interface process
Researchers measured how four types of nanoplastics aggregate with iron minerals and found that surface chemistry drives the outcome — with PMMA forming the strongest heteroaggregates and carboxyl-modified particles the weakest — and that electron transfer from nanoplastics to hematite partially reduces iron, with implications for aquatic iron cycling.
Deposition behaviors of carboxyl-modified polystyrene nanoplastics with goethite in aquatic environment: Effects of solution chemistry and organic macromolecules
Researchers systematically measured how pH, ions, and dissolved organic molecules affect the settling of carboxylated nanoplastics onto the iron mineral goethite, finding that higher pH, multivalent anions, and organic macromolecules (especially alginate) strongly inhibit deposition through electrostatic repulsion and steric hindrance.
Effects of inorganic ions and natural organic matter on the aggregation of nanoplastics
Researchers investigated how inorganic ions and natural organic matter (NOM) influence the aggregation of polystyrene nanoplastics, finding that iron ions uniquely promote aggregation while NOM can either suppress or enhance clumping depending on iron concentration, with electrostatic forces and surface chemistry governing overall particle stability.
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.
Heteroaggregation of PS microplastic with ferrihydrite leads to rapid removal of microplastic particles from the water column
Researchers investigated heteroaggregation between polystyrene microplastics and ferrihydrite iron mineral particles, finding that this aggregation process leads to rapid removal of microplastic particles from the water column, with implications for understanding microplastic fate and transport in natural water systems.
UV-weathering affects heteroaggregation and subsequent sedimentation of polystyrene microplastic particles with ferrihydrite
UV weathering of polystyrene microplastics significantly altered their surface properties, increasing heteroaggregation with ferrihydrite iron colloids and accelerating particle sedimentation compared to pristine PS—demonstrating that environmental weathering substantially changes microplastic fate and removal in aquatic systems.
Impact of electrolyte and natural organic matter characteristics on the aggregation and sedimentation of polystyrene nanoplastics
Researchers examined how dissolved organic matter from different water sources affects the aggregation and sedimentation of polystyrene nanoplastics under varied salt concentrations and temperatures, finding that biopolymers form a protective 'eco-corona' around particles that strongly inhibits long-term sedimentation, while temperature influences aggregation dynamics in complex ways.
Charge mediated interaction of polystyrene nanoplastic (PSNP) with minerals in aqueous phase
Researchers investigated how polystyrene nanoplastics interact with common soil and sediment minerals, finding that positively charged iron oxide minerals (goethite and magnetite) strongly adsorb nanoplastics via electrostatic attraction and hydrogen bonding, while negatively charged clay minerals do not — providing mechanistic insight into how nanoplastics may accumulate in iron-rich soils and sediments.
UV-weathering affects heteroaggregation and subsequent sedimentation of polystyrene microplastic particles with ferrihydrite
Researchers studied how UV weathering alters the heteroaggregation and sedimentation behaviour of 1-micrometre polystyrene microplastic particles with ferrihydrite (an iron oxy-hydroxide common in natural waters). They found that UV weathering changed the surface charge and properties of polystyrene particles, significantly affecting their aggregation with ferrihydrite at neutral pH and their subsequent removal from the water column by sedimentation.
Heteroaggregation of PS microplastic with ferrihydrite leads to rapid removal of microplastic particles from the water column
Researchers found that ferrihydrite, a natural iron mineral, rapidly removes polystyrene microplastics from the water column through heteroaggregation and enhanced sedimentation, suggesting natural mineral interactions may help sequester microplastics in aquatic environments.
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.
UV/ozone induced physicochemical transformations of polystyrene nanoparticles and their aggregation tendency and kinetics with natural organic matter in aqueous systems
Researchers weathered polystyrene nanoparticles with UV light and ozone and then tested their aggregation behavior in waters containing humic acid, lysozyme, and alginate, finding that weathering-induced oxygen-containing surface groups significantly altered aggregation kinetics in ways strongly dependent on which organic molecules were present.
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.
Impact of Minerals (Ferrihydrite and Goethite) and Their Organo-Mineral Complexes on Fate and Transport of Nanoplastics in the Riverine and Terrestrial Environments
Researchers studied how common iron minerals and their organic matter complexes affect the movement and fate of nanoplastics in river and soil environments. The study found that pure minerals had higher sorption capacity for nanoplastics than their organo-mineral counterparts, and goethite-based systems caused greater aggregation and retention of nanoplastics, suggesting that soil mineral composition plays an important role in nanoplastic transport.
The heteroaggregation and deposition behavior of nanoplastics on Al2O3 in aquatic environments
Researchers systematically investigated heteroaggregation between polystyrene nanoplastics and aluminum oxide particles in aquatic environments, finding significant aggregation under acidic and neutral conditions that increased with ionic strength. Humic acid and fulvic acid inhibited deposition of nanoplastics onto aluminum oxide surfaces through charge reversal and steric repulsion, with humic acid being more effective.
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.
Deposition behaviors and interfacial interaction mechanism between carboxyl-modified polystyrene nanoplastics and magnetite in aquatic environment
This study examined how solution chemistry (ionic strength, pH) and organic matter influence the deposition behavior of carboxyl-modified polystyrene nanoplastics onto iron (hydr)oxide mineral surfaces in aquatic environments. The results revealed that organic matter and solution chemistry strongly govern NP-mineral interfacial interactions and nanoplastic transport in subsurface environments.
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.