We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Adsorption of 2-hydroxynaphthalene, naphthalene, phenanthrene, and pyrene by polyvinyl chloride microplastics in water and their bioaccessibility under in vitro human gastrointestinal system
AI summary Read the abstract
Researchers studied how polyvinyl chloride microplastics adsorb organic pollutants including naphthalene and pyrene, and then tested how these pollutants are released in simulated human digestive fluids. The study found that larger aromatic compounds with more rings adsorbed more strongly to microplastics, and that pollutant release rates were higher in human gastrointestinal fluid than in fish intestinal fluid.
The interaction of microplastics (MPs) and organic pollutants has recently become a focus of investigation. To understand how microplastic residues affect the migration of organic pollutants, it is necessary to examine the adsorption and desorption behavior of organic pollutants on MPs. In this study, integrated adsorption/desorption experiments and theoretical calculations were used to clarify the adsorption mechanism of 2-hydroxynaphthalene (2-OHN), naphthalene (NAP), phenanthrene (PHE), and pyrene (PYR) by polyvinyl chloride microplastics (PVC-MPs). Based on the phenomenological mathematical models, the rate-limiting step for analyte adsorption onto PVC-MPs was adsorption onto active sites (R2 = 0.865-0.995). Except for PHE, analyte adsorption isotherms were well described by the Freundlich model (R2 = 0.992-0.998), and adsorption thermodynamics showed that analyte adsorption on PVC-MPs was a spontaneous exothermic process (ΔH0 < 0; ΔG0 < 0). Based on the order of adsorption efficiency of 2-OHN < NAP < PHE < PYR, which is identical to the competitive adsorption experiment, polycyclic aromatic hydrocarbon (PAH) adsorption on PVC-MPs increased as the aromatic ring number increased and the hydroxyl content decreased. The release of 2-OHN (49 %-52 %) from PVC-MPs into the simulated gastrointestinal environment was greater than that of NAP (5.5 %-5.7 %). Theoretical calculations and adsorption tests indicated that hydrophobic interaction was the primary influence on the adsorption of PAHs and their hydroxylated derivatives by PVC-MPs. These findings improve our understanding of MPs' behavior and dangers as pollutant carriers in the aquatic environment and help us develop recommendations for the pollution control of MPs.
More Papers Like This
The adsorption and desorption behaviors of phenanthrene and pyrene onto microplastics in the aquatic environment and digestive fluids
AI summary Read the abstract
This study examined how polycyclic aromatic hydrocarbons (PAHs) like phenanthrene and pyrene adsorb to and desorb from four types of microplastics in both freshwater and simulated digestive fluids. The findings show that PAHs bind strongly to microplastics and can be released under digestive conditions, suggesting that microplastics can deliver organic pollutants to organisms that ingest them.
Adsorption mechanism of typical monohydroxyphenanthrene on polyvinyl chloride microplastics
AI summary Read the abstract
Researchers studied how a pollutant derived from phenanthrene (a polycyclic aromatic hydrocarbon) adsorbs onto polyvinyl chloride microplastics in water. They found the organic compound binds tightly to PVC surfaces, adding to evidence that microplastics can accumulate and transport toxic chemicals in aquatic environments.
Microplastics serve as a potential vector for the transfer of naphthalene from freshwater to the human gastrointestinal system
AI summary Read the abstract
Researchers investigated whether microplastics can transfer the pollutant naphthalene from freshwater into the human gastrointestinal system. The study examined three types of microplastics and found they can adsorb naphthalene from water and subsequently release it under simulated digestive conditions, suggesting microplastics may act as vectors that carry environmental contaminants into the human body through ingested water or food.
Sorption of Pyrene and Fluoranthene onto Common Microplastics Under Freshwater Conditions
AI summary Read the abstract
Researchers investigated how two common polycyclic aromatic hydrocarbons, pyrene and fluoranthene, bind to six different types of microplastic polymers under freshwater conditions. The study found significant differences in sorption capacity across polymer types, confirming that microplastics can act as vectors for transporting harmful organic pollutants through aquatic environments.
Adsorption of phenanthrene and its monohydroxy derivatives on polyvinyl chloride microplastics in aqueous solution: Model fitting and mechanism analysis
AI summary Read the abstract
Researchers investigated the adsorption of phenanthrene and its four monohydroxy derivatives on polyvinyl chloride microplastics in aqueous solution, finding that phenanthrene adsorption was higher than that of its hydroxylated forms. The data fitted pseudo-second-order kinetics and Freundlich isotherm models, indicating that hydroxyl functional groups on pollutant molecules reduce their affinity for PVC microplastic surfaces.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.