Polycyclic aromatic hydrocarbon derivatives onto polar microplastics of polyurethane: equilibrium, thermodynamics, and kinetics of monolayer-multilayer adsorption.

Autor: Frescura LM; Laboratório de Análises Químicas E Farmacêuticas (LAQUIF), Department of Chemistry, Universidade Federal de Santa Maria - UFSM, Av. Roraima, 1000‑17, Santa Maria, RS, 97105-900, Brazil.; Programa de Pós-Graduação em Química, Universidade Federal de Santa Maria, Santa Maria, Brazil., de Menezes BB; Laboratório de Análises Químicas E Farmacêuticas (LAQUIF), Department of Chemistry, Universidade Federal de Santa Maria - UFSM, Av. Roraima, 1000‑17, Santa Maria, RS, 97105-900, Brazil.; Programa de Pós-Graduação em Química, Universidade Federal de Santa Maria, Santa Maria, Brazil., Junior RAF; Laboratório de Análises Químicas E Farmacêuticas (LAQUIF), Department of Chemistry, Universidade Federal de Santa Maria - UFSM, Av. Roraima, 1000‑17, Santa Maria, RS, 97105-900, Brazil.; Programa de Pós-Graduação em Química, Universidade Federal de Santa Maria, Santa Maria, Brazil., Mortari SR; Programa de Pós-Graduação Em Nanociências, Universidade Franciscana - UFN, Santa Maria, Rio Grande Do Sul, Brazil., de Moraes Bastos AF; Laboratório de Análises Químicas E Farmacêuticas (LAQUIF), Department of Chemistry, Universidade Federal de Santa Maria - UFSM, Av. Roraima, 1000‑17, Santa Maria, RS, 97105-900, Brazil., da Rosa MB; Laboratório de Análises Químicas E Farmacêuticas (LAQUIF), Department of Chemistry, Universidade Federal de Santa Maria - UFSM, Av. Roraima, 1000‑17, Santa Maria, RS, 97105-900, Brazil. marcelo.b.rosa@ufsm.br.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Sep; Vol. 31 (43), pp. 55158-55168. Date of Electronic Publication: 2024 Sep 02.
DOI: 10.1007/s11356-024-34848-9
Abstrakt: The study of the adsorption of polycyclic aromatic hydrocarbons on microplastics (MPs) has attracted much attention as to how microplastics can act as carriers of these pollutants. Polyurethane (PU) is one of the MPs found in aquatic environments, containing different functional groups it can interact with polar and nonpolar molecules. PAH derivatives (dPAHs) present different properties and thus can be adsorbed by different interactions; thus, this study investigated the adsorption of fluorene (FLN), dibenzothiophene (DBT), dibenzofuran (DBF), and carbazole (CBZ) onto PU MP. The Langmuir, Freundlich, and BET isotherm models were examined, and the BET model best fitted. The adsorption was a nonspontaneous process, exothermic for mono- and multilayer formation for FLN, DBT, and CBZ, and endothermic for DBF monolayer formation. The adsorption monolayer was formed by van der Waals forces, H─bonding, and π─π interactions, while the formation of the multilayer can be explained by π─π and hydrophobic interactions. The pseudo-second-order model proved to be more consistent for the adsorption of dPAHs. The adsorption in artificial seawater shows no significant differences for the monolayer but favored the adsorption multilayer due to the salting-out effect. Due to the existence of several adsorption mechanisms, PU MP interacts with dPAHs in greater quantities when compared to a MP with a simpler structure.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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