Studying the adsorption mechanisms of nanoplastics on covalent organic frameworks via molecular dynamics simulations
| Autor: | Youxing Liu, Bin Wu, Jichen Dong, Yunqi Liu, Shengcong Shang, Xinyu Wang, J. C. Chen, Minghui Liu, Yichao Bai |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Environmental Engineering Chemistry Health Toxicology and Mutagenesis Supramolecular chemistry Polymer Polyethylene Pollution symbols.namesake chemistry.chemical_compound Molecular dynamics Adsorption Chemical engineering Covalent bond symbols Environmental Chemistry Molecule van der Waals force Waste Management and Disposal |
| Zdroj: | Journal of Hazardous Materials. 421:126796 |
| ISSN: | 0304-3894 |
| Popis: | Covalent organic frameworks (COFs) with well-defined supramolecular structures and high surface-area-to-volume ratio have received extensive attention on their adsorption of contaminants from micro- to nano-size. Here, we studied the adsorption mechanisms of three typical nanoplastics (NP), including polyethylene (PE), nylon-6 (PA 6), and polyethylene terephthalate (PET) on chemically stable COFs (TpPa-X, X = H, CH3, OH, NO2 and F) by molecular dynamics simulations. Depending on molecular structure and surface composition, two distinct interactions–electrostatic interaction and van der Waals (vdW) interaction–are identified to be responsible for the adsorption of different NP pollutants on TpPa-X. The vdW interaction is dominant during the adsorption process, while polar groups in polymers and COFs can enhance the adsorption because of the electrostatic interaction. Compared with other functional COFs, we found that TpPa-OH shows the strongest adsorption with the NP pollutants employed in this study. This work reveals the COF-polymer adsorption behavior and properties at atomic scale, which is crucial to the development of promising COF materials to deal with NP pollution. |
| Databáze: | OpenAIRE |
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