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61,005 resultsShowing papers similar to Influence of titanium dioxide nanoparticles on the transport and deposition of microplastics in quartz sand
ClearMicroplastic types dominate the effects of bismuth oxide semi-conductor nanoparticles on their transport in saturated quartz sand
Column transport experiments found that the type of microplastic (polystyrene vs. polyethylene vs. polypropylene) dominated the effects of bismuth oxide semiconductor nanoparticles on microplastic mobility in saturated quartz sand, with different polymer-nanoparticle combinations showing distinct transport and retention behaviors.
Transport of polystyrene microplastics in bare and iron oxide-coated quartz sand: Effects of ionic strength, humic acid, and co-existing graphene oxide
Researchers investigated how graphene oxide nanoparticles and humic acid influence the transport of polystyrene microplastics through sand columns, comparing bare quartz sand with iron oxide-coated sand. They found that iron oxide-coated sand strongly retained microplastics regardless of other factors, while graphene oxide significantly promoted microplastic transport by increasing surface charge and creating steric barriers. The study suggests that the co-presence of nanomaterials and organic matter in the environment can significantly alter how microplastics move through soil and groundwater systems.
[Transport and Model Calculation of Microplastics Under the Influence of Ionic Type, Strength, and Iron Oxide].
Laboratory column experiments showed that calcium ions strongly inhibit the transport of polystyrene microplastics through quartz sand via bridging and charge neutralization effects, while iron oxide coatings on sand grains further reduce microplastic mobility through surface adsorption. Understanding these transport dynamics is important for predicting how microplastics move through soil and groundwater systems and assessing contamination risks to drinking water sources.
Transport behavior of micro polyethylene particles in saturated quartz sand: Impacts of input concentration and physicochemical factors
Laboratory sand column experiments showed that polyethylene microplastic transport is inhibited by high ionic strength (as it reduces the repulsion between particles and sand grains) but enhanced by fulvic acid (which increases surface charge repulsion). The study provides mechanistic data for predicting how microplastics move through soils under different environmental chemical conditions.
Transport of polystyrene nanoplastics in natural soils: Effect of soil properties, ionic strength and cation type
Researchers used column experiments across three soil types to show that polystyrene nanoplastic transport is governed by soil iron and aluminum oxide content and pH — with high-pH, low-oxide soils allowing up to 97% nanoplastic passage — and that calcium ions and higher ionic strength significantly increase retention, revealing that soil chemistry strongly controls nanoplastic mobility toward groundwater.
Influence of Nano- and Microplastic Particles on the Transport and Deposition Behaviors of Bacteria in Quartz Sand
Laboratory column experiments showed that nano- and microplastic particles significantly altered the transport and deposition of bacteria in porous quartz sand, with plastic particles either facilitating or inhibiting bacterial mobility depending on size and surface charge. The findings suggest that microplastics in soil and sediment environments could affect the spread of bacteria, including potential pathogens.
Co-transport of polystyrene microplastics and kaolinite colloids in goethite-coated quartz sand: Joint effects of heteropolymerization and surface charge modification
Column experiments showed that kaolinite colloids enhanced polystyrene microplastic transport through quartz sand but had more complex effects in goethite-coated sand, where the promotion depended strongly on ionic strength conditions due to heteropolymerization and surface charge modification.
Deposition of synthetic polystyrene and low-density polyethylene to quartz sand in different background solutions
This study examined the deposition of polystyrene and low-density polyethylene micro- and nanoplastics onto quartz sand under varying ionic strength and pH conditions, finding that surface chemistry and solution composition strongly influence plastic particle transport and retention in the subsurface.
Sensitivity of the Transport of Plastic Nanoparticles to Typical Phosphates Associated with Ionic Strength and Solution pH
This study investigated how phosphate ions in soil pore water influence the transport of plastic nanoparticles through porous media under varying pH and ionic strength conditions. Phosphate affected nanoparticle surface charge and aggregation behavior, altering how far particles traveled. The findings are relevant to understanding how plastic nanoparticles move through soils and groundwater systems.
Microplastics/nanoplastics in porous media: Key factors controlling their transport and retention behaviors
This review examines what controls how microplastics and nanoplastics move through soil and other porous materials like sand and sediment. Factors like particle size, shape, surface charge, water flow speed, and the presence of other pollutants all influence whether plastics stay in place or travel deeper into groundwater. Understanding these transport behaviors is important for assessing the risk of microplastics contaminating underground drinking water sources.
Micro- and nanoplastics retention in porous media exhibits different dependence on grain surface roughness and clay coating with particle size
Researchers found that grain surface roughness and clay coatings affect the retention of microplastics and nanoplastics in porous media differently depending on particle size, with nanoplastics behaving oppositely to microplastics in certain soil conditions — complicating predictions of plastic transport in groundwater systems.
Effect of shape on the transport and retention of nanoplastics in saturated quartz sand
Researchers compared the transport of spherical versus toroid-shaped nanoplastics through quartz sand columns, finding that irregular toroid particles traveled significantly less far than spheres due to lower energy barriers and greater tendency to accumulate along pore walls — highlighting that particle shape must be considered when predicting nanoplastic fate in soil and groundwater.
Mechanism comparisons of transport-deposition-reentrainment between microplastics and natural mineral particles in porous media: A theoretical and experimental study
Researchers compared the transport, deposition, and re-entrainment behavior of microplastic particles versus natural mineral particles in porous media, finding key differences driven by density, surface charge, and shape that affect how microplastics migrate through soils and sediments.
Effects of solution chemistry and humic acid on the transport of polystyrene microplastics in manganese oxides coated sand
Column experiments showed that polystyrene microplastics had significantly lower mobility through manganese oxide-coated sand than bare sand due to electrostatic attraction and surface roughness, with humic acid increasing transport and co-transport with cadmium reducing it.
Decreased transport of nano- and micro-plastics in the presence of low-molecular-weight organic acids in saturated quartz sand.
Laboratory experiments showed that common organic acids found in soil — citric, malic, and tartaric acid — significantly reduced the movement of polystyrene nano- and microplastics through saturated sand. This finding suggests that soil organic chemistry influences how microplastics migrate toward groundwater, which has implications for drinking water contamination in agricultural areas.
Investigation for Synergies of Ionic Strength and Flow Velocity on Colloidal-Sized Microplastic Transport and Deposition in Porous Media Using the Colloidal–AFM Probe
Experiments showed that both water flow speed and salt concentration work together to control how microplastic particles stick to and move through sand and soil. Understanding these combined effects is important for predicting how microplastics travel through groundwater and contaminate water supplies.
Effects of physicochemical factors on transport and retention of polystyrene microplastics (PS-MPs) in homogeneous and heterogeneous saturated porous media
Researchers studied how polystyrene microplastics move through different types of underground soil and sand formations. They found that smaller sand grains, higher salt concentrations, and the presence of calcium ions all increased microplastic retention, while mixed soil layers created preferential flow paths that allowed some particles to break through faster. The findings help explain how microplastics could potentially contaminate groundwater aquifers.
Impact of particle size and oxide phase on microplastic transport through iron oxide-coated sand
Researchers studied how different types of iron oxide coatings on sand affect the movement of polystyrene microplastics through soil. They found that magnetite-coated sand retained the most microplastics, while goethite-coated sand retained the least, with results matching theoretical predictions. The findings suggest that naturally iron-rich soils could serve as effective barriers to prevent microplastic transport through groundwater systems.
Binary transport of PS and PET microplastics in saturated quartz sand: Effect of sand particle size and PET shape
Not all microplastics behave the same way when they enter groundwater or soil — their shape, size, and the plastic type all influence how far they travel. This study tracked how spherical and fragment-shaped microplastics of two polymer types (polystyrene and PET) moved through sand columns, finding that fragment-shaped particles were significantly less mobile than spheres, and that when both types were present together, the spheres helped carry fragments further by forming aggregates. These findings are important for predicting how microplastics contaminate groundwater and for designing remediation strategies.
Quantification of two-site kinetic transport parameters of polystyrene nanoplastics in porous media
This laboratory study tracked how polystyrene nanoplastics move through different soil types by measuring their transport through columns packed with quartz sand and clay minerals. Higher pH conditions reduced the ability of clay minerals to trap nanoplastics, meaning they traveled farther and faster through soil toward groundwater. Understanding these transport dynamics is key to predicting how nanoplastic contamination spreads through soils and ultimately reaches drinking water sources.
Effect of particle size on the transport of polystyrene micro- and nanoplastic particles through quartz sand under unsaturated conditions
This study tested how different sizes of polystyrene micro and nanoplastics move through sand under conditions similar to soil with some moisture. Smaller particles (120 nanometers) passed through easily with 95% recovery, while larger particles (10,000 nanometers) were completely trapped. The findings suggest that the tiniest nanoplastics can readily travel through soil to reach groundwater, creating a potential pathway for plastic contamination of drinking water sources.
The individual transport, cotransport and immobilization with solar pyrolysis biochar of microplastics and plasticizer in sandy soil
Researchers tracked the individual transport, co-transport, and immobilization of microplastics in porous media, finding that plastic particle behavior differs significantly depending on surface charge and pore structure interactions. The results improve predictions of where microplastics migrate and accumulate in soils and aquifers.
Transport and deposition behaviors of microplastics in porous media: Co-impacts of N fertilizers and humic acid
Inorganic and organic nitrogen fertilizers and humic acid were found to influence the transport and deposition of microplastics in porous media, with humic acid promoting microplastic mobility while ammonium chloride and urea had different effects on particle retention in soil columns.
Transport of functional group modified polystyrene nanoplastics in binary metal oxide saturated porous media
Researchers found that the surface functional groups of polystyrene nanoplastics significantly influenced their transport behavior through binary metal oxide porous media, with solution chemistry and the specific combination of metal oxides playing key roles in determining nanoplastic mobility in soil environments.