Abstract
Plastics pollutants, especially microplastics (MPs, <5mm in diameter) and levofloxacin hydrochloride (Lev-HCl) often co-exist in the aquatic environment. To explore the adsorption processes and mechanisms of Lev-HCl by non-degradable MPs, in this study, H2O2 oxidation was used to age polyvinyl chloride (PVC), polystyrene (PS), and polyethylene terephthalate (PET) MPs. The results demonstrated that the equilibrium adsorption capacity increased significantly after aging, as H2O2-PET (1.167 mg/g) > PET (0.995 mg/g), H2O2-PS (1.057 mg/g) > PS (0.957 mg/g), H2O2-PVC (1.107 mg/g) > PVC (0.975 mg/g). After H2O2 aging, the hydrogen bond (-OH) was more obvious, and π-π interactions were significantly enhanced. These non-degradable MPs mainly adsorbed Lev-HCl by micropore filling (contributions: PVC 65.9%, PS 56%, PET 63.5%). The current study highlights the potential of non-degradable MPs to act as a vector for Lev-HCl in the aquatic environment, especially after H2O2 aging. PRACTITIONER POINTS: Adsorption behavior of Lev-HCl onto three non-degradable MPs was elucidated. The adsorption capacity increased significantly after aging for PVC, PS, and PET MPs. The hydrogen bonding and π-π interactions of H2O2-aged MPs were more significant. Multi-layer adsorption on non-homogeneous surfaces via micropore filling was revealed.
Published Version
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