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Binding of nanoplastics of polystyrene to nanolignin particles
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Researchers investigated interactions between lignin nanoparticles and polystyrene nanoplastics, finding that pH significantly influenced aggregation behavior with the most pronounced aggregation occurring at pH 2, suggesting that environmental pH plays a critical role in determining how lignin nanoparticles interact with nanoplastic particles in natural settings.
V diplomskem delu sem raziskovala interakcije med ligninskimi nanodelci (LNP) in nanoplastiko iz polistirena (nano PS). Iz biomase mlete slame sem izolirala tri različne vrste lignina: kraft, organosolv in lignosulfonat. Raziskala sem pripravo nanodelcev iz vseh treh vrst lignina, pri čemer sem za modelno študijo interakcij izbrala LNP organosolv lignina s spiranjem (LNP-S). Za študijo interakcij sem uporabila sintetizirano nano PS (hitrost mešanja 800 rpm). Velikost delcev in stopnjo agregacije v suspenzijah LNP-S in nano PS pri različnih pH vrednostih sem določila z uporabo metode dinamičnega sipanja svetlobe (DLS). Pri pH 2 sem opazila najbolj izrazito agregacijo delcev, kar nakazuje na interakcije med LNP-S in nano PS. Rezultati potrjujejo, da pH okolja pomembno vpliva na obnašanje LNP in njihovo sposobnost interakcije z delci nanoplastike, kar predstavlja pomemben korak k razumevanju njihovih potencialnih interakcij v naravi.
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Impact of iron/aluminum (hydr)oxide and clay minerals on heteroaggregation and transport of nanoplastics in aquatic environment
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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.
Influence of environmental and biological macromolecules on aggregation kinetics of nanoplastics in aquatic systems
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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.
Effects of inorganic ions and natural organic matter on the aggregation of nanoplastics
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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.
Lignin-stabilized polystyrene dispersions as nanoplastic reference materials
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Researchers developed environmentally relevant polystyrene nanoplastic reference materials by coating particles with three lignin biopolymers during anti-solvent precipitation, finding that a 2% softwood kraft lignin formulation produced well-dispersed 110 nm particles with ~90% mass recovery by forming a thin stabilizing electrosteric layer rather than the artificial surfactants used in conventional lab standards.
Crystallinity- dependent heteroaggregation and co-sedimentation between polystyrene nanoplastics and iron (hydro)oxides
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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.
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