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The individual transport, cotransport and immobilization with solar pyrolysis biochar of microplastics and plasticizer in sandy soil
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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.
The transport behaviors and immobilization of microplastics and plasticizer in soil have attracted increasing concern. In this study, the individual transport and cotransport mechanisms of polyvinyl chloride MPs (PVC MPs) and dimethyl phthalate (DMP), as well as their immobilization by solar pyrolysis biochar (SPBC) were investigated. Compared to SPBC (>1.52 mg g) and sandy soil (>0.045 mg g), PVC MPs exhibited higher DMP adsorption capacity (>39.2 mg g) via halogen bonds and so on. The DMP exhibited high mobility in sandy soil, which lightly influenced by soil metal oxides and organic matter. The PVC MPs showed low mobility in sandy soil, which was significantly controlled by metal oxides (increasing TMR by 24.37 %) but lightly influenced by soil organic matter (increasing TMR by 3.69 %). The PVC MPs and DMP mutually inhibited the mobility with each other's, and PVC MPs showed weak carrier effect on DMP mobility during cotransport process. The addition of SPBC in sandy soil effectively immobilized DMP (reducing TMR by 27.13-45.23 %), whereas slightly increased PVC MPs mobility by 4.26-7.43 %. This work firstly revealed the antagonistic cotransport mechanisms and SPBC immobilization effect of PVC MPs and DMP in sandy soil, contributing to the advanced risk assessment and remediation strategies for co-contaminated soils.
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Cotransport and deposition of biochar with different sized-plastic particles in saturated porous media
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Researchers studied how biochar and plastic particles (nanoplastics and microplastics) mutually affect each other's transport through water-saturated sand, finding that small plastic particles enhanced biochar mobility while biochar consistently suppressed plastic particle transport across all sizes, due to heteroaggregation altering surface charge and steric interactions.
Mechanism comparisons of transport-deposition-reentrainment between microplastics and natural mineral particles in porous media: A theoretical and experimental study
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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.
Microplastics/nanoplastics in porous media: Key factors controlling their transport and retention behaviors
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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.
Cotransport of different electrically charged microplastics with PFOA in saturated porous media
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Researchers examined how differently charged microplastics co-transport with PFOA through saturated porous media, finding that surface charge significantly influences both MP mobility and PFOA transport behavior, with implications for groundwater contamination.
Micro- and nanoplastics retention in porous media exhibits different dependence on grain surface roughness and clay coating with particle size
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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.
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