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61,005 resultsShowing papers similar to The regulation of the environmental behavior of NPs by humic acid: A review
ClearFurther 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.
Humic acid can mitigate or magnify nanoplastic toxicity to freshwater microalgae: what are the factors driving these contrasting effects?
Researchers explored how humic acid, a natural organic substance found in water, interacts with nanoplastics to either reduce or amplify their toxicity to freshwater microalgae. The study found that humic acid can mitigate nanoplastic toxicity by reducing surface hydrophobicity and improving particle dispersion, but this protective effect diminishes at low humic acid concentrations.
Joint effect of nanoplastics and humic acid on the uptake of PAHs for Daphnia magna: A model study
This study examined how humic acid (a form of dissolved organic matter) modifies the bioaccumulation of polycyclic aromatic hydrocarbons in aquatic organisms exposed to nanoplastics, finding that humic acid significantly altered the joint effects of the two complex matrices. The results indicate that natural organic matter plays an important role in regulating nanoplastic-associated chemical uptake.
Role of Humic Substances in the (Bio)Degradation of Synthetic Polymers under Environmental Conditions
This review examines the role of humic substances -- major components of soil organic matter -- in the degradation of synthetic polymers under environmental conditions. The authors discuss how humic substances mediate chemical and biological breakdown of plastics, influencing the formation and persistence of microplastics in soils and aquatic systems.
Humic acid alleviates the toxicity of polystyrene nanoplastic particles toDaphnia magna
Daphnia magna were exposed to polystyrene nanoplastics with and without humic acid, finding that humic acid significantly reduced nanoplastic toxicity by altering particle aggregation and distribution within the organism. The study demonstrates that natural organic matter in water can modulate nanoplastic bioavailability, with implications for risk assessment under realistic environmental conditions.
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.
Alleviating binary toxicity of polystyrene nanoplastics and atrazine to Chlorella vulgaris through humic acid interaction: Long-term toxicity using environmentally relevant concentrations
Researchers found that when nanoplastics and the herbicide atrazine were combined in water, they had a synergistic toxic effect on algae that was worse than either pollutant alone. However, adding humic acid, a natural substance found in soil and water, significantly reduced this combined toxicity by coating the nanoplastics and changing their surface properties. This suggests that natural organic matter in the environment may offer some protection against the harmful effects of nanoplastic-chemical mixtures.
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.
Humic acid alleviates the toxicity of polystyrene nanoplastics in combination with their copper nanoparticle co-pollutants in Artemia salina
Researchers examined how humic acid, a natural organic substance found in soil and water, affects the toxicity of polystyrene nanoplastics combined with copper nanoparticles in brine shrimp. They found that humic acid reduced the harmful effects of these co-pollutants, likely by coating the particles and limiting their biological interactions. The study suggests that natural organic matter in the environment may help buffer some of the toxic effects of nanoplastic pollution.
Interaction between microplastics and humic acid and its effect on their properties as revealed by molecular dynamics simulations
Researchers used molecular dynamics simulations to study how microplastics interact with humic acid, a natural organic compound found in soil and water. They found that microplastics disrupted the hydrogen bonding and calcium coordination within humic acid, altering its structure and properties. The study suggests that when microplastics and humic acid combine in the environment, both materials behave differently than they would alone, which could affect pollutant transport in natural systems.
Role of Humic Substances in the (Bio)degradation of Synthetic Polymers under Environmental Conditions
This review examines how humic substances influence the biodegradation of synthetic polymers across environmental compartments including freshwater, marine, and soil ecosystems, exploring the interactions between polymer chemistry, microbial communities, and naturally occurring organic matter. The study highlights the complex relationships governing polymer breakdown rates and the role of humic substances in either facilitating or hindering microbial degradation processes.
Humic compounds in marine ecosystems - Ecological importance in transitional Mediterranean zones
This review examines humic substances — naturally occurring organic compounds in marine water — and their ecological roles in Mediterranean transitional zones. Humic substances can interact with microplastics in seawater, coating their surfaces and affecting how plastic particles behave, aggregate, and are taken up by marine organisms.
Interfacial interactions of humic acids with polystyrene nano-plastics in aqueous/ionic environments: a molecular dynamics exploration
Researchers used molecular dynamics simulations to investigate how humic acid molecules interact with carboxylated polystyrene nanoplastics in water, finding that humic substances form an eco-corona on the nanoplastic surface that alters its environmental behavior and potential toxicity.
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.
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.
Aggregation kinetics of fragmental PET nanoplastics in aqueous environment: Complex roles of electrolytes, pH and humic acid
Researchers investigated the aggregation kinetics of fragmental PET nanoplastics under varying electrolyte concentrations, pH, and humic acid conditions, finding that aggregation increased with higher electrolyte concentrations and lower pH. Divalent cations caused stronger aggregation than monovalent cations at equal concentrations, and humic acid significantly inhibited aggregation, highlighting how natural water chemistry governs nanoplastic fate.
Interaction, Adhesion and Aggregation of Microplastic/Nanoplastic Particles: Effects of Plastic Polymer Type
This review examines how polymer type, particle size, shape, pH, ionic strength, and salt composition influence the interaction, adhesion, and aggregation behavior of microplastics and nanoplastics in aquatic and soil environments. The paper synthesizes findings on homoaggregation and heteroaggregation with natural and engineered nanoparticles, highlighting how aggregation affects particle transport and environmental fate.
Exploring Humic Acid as an Efficient and Selective Adsorbent for Lead Removal in Multi-Metal Coexistence Systems: A Review
This review examines how humic acid, a natural substance found in soil and water, can selectively remove lead from water contaminated with multiple heavy metals. The research explores how to enhance humic acid's ability to capture lead ions specifically, including through chemical activation and pH control. While focused on heavy metals, the work is relevant to microplastics research because microplastics can concentrate and transport lead and other heavy metals, and better lead removal from water could reduce this combined pollution threat.
Stabilization of Fragmental Polystyrene Nanoplastic by Natural Organic Matter: Insight into Mechanisms
This study investigated how natural organic matter stabilizes fragmental polystyrene nanoplastics in aqueous environments, finding that humic and fulvic acid coatings reduce aggregation and enhance colloidal stability, affecting nanoplastic transport and bioavailability.
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.
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.
Interactions between polypropylene microplastics (PP-MPs) and humic acid influenced by aging of MPs
Researchers examined how aging affects polypropylene microplastic interactions with humic acid, finding that aged microplastics with increased surface oxygen groups showed stronger adsorption of humic acid compared to pristine particles, altering their environmental behavior.
Interactions of humic acid with pristine poly (lactic acid) microplastics in aqueous solution
Researchers studied the adsorption of humic acid onto polylactic acid (PLA) microplastics in water, finding that humic acid forms a coating on PLA surfaces through hydrophobic and electrostatic interactions, altering the environmental behavior of this biodegradable plastic.
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.