Interaction of fluorene and its analogs with high-density polyethylene microplastics: An assessment of the adsorption mechanism to establish the effects of heteroatoms in the molecule.

Autor: Frescura LM; Universidade Federal de Santa Maria - UFSM, Department of Chemistry, Av. Roraima, 1000, 97105-900, Santa Maria, RS, Brazil., Funari Junior RA; Universidade Federal de Santa Maria - UFSM, Department of Chemistry, Av. Roraima, 1000, 97105-900, Santa Maria, RS, Brazil., Brummelhaus de Menezes B; Universidade Federal de Santa Maria - UFSM, Department of Chemistry, Av. Roraima, 1000, 97105-900, Santa Maria, RS, Brazil., Flávia de Moraes Bastos A; Universidade Federal de Santa Maria - UFSM, Department of Chemistry, Av. Roraima, 1000, 97105-900, Santa Maria, RS, Brazil., Barcellos da Rosa M; Universidade Federal de Santa Maria - UFSM, Department of Chemistry, Av. Roraima, 1000, 97105-900, Santa Maria, RS, Brazil. Electronic address: marcelo.b.rosa@ufsm.br.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2023 Nov 15; Vol. 337, pp. 122573. Date of Electronic Publication: 2023 Sep 16.
DOI: 10.1016/j.envpol.2023.122573
Abstrakt: The threat of microplastics (MP) pollution in aquatic ecosystems can be even more severe for they are able to interact with organic pollutants that can migrate to adjacent environments. The presence of heteroatoms in organic pollutants can directly influence adsorption onto MP. This research evaluated the adsorption of fluorene (FLN) and its heteroatom analogs dibenzothiophene (DBT), dibenzofuran (DBF) and carbazole (CBZ) onto high-density polyethylene (HDPE) MP from residual (HDPE res ) and commercial (HDPE com ) sources. The Langmuir isotherm showed a better fit, while DBT showed higher maximum adsorption capacity (19.2 and 15.8 μmol g -1 ) followed by FLN (13.4 and 11.7 μmol g -1 ), and DBF (13.5 and 10.3 μmol g -1 ) to the HDPE com and HDPE res, respectively, which indicates a direct correlation with the hydrophobicity of the molecules determined by Log K ow . In contrast, CBZ showed no significant interaction with MP, due to their polar characteristic, thus, no kinetic and thermodynamic parameters could be determined. The adsorption process of all PAH was determined to be exothermic and spontaneous, with low temperatures favoring the process. The pseudo-second-order kinetic models have fitted to the adsorption onto both HDPE; intraparticle diffusion was also observed. Computational studies, physical characterization techniques and batch adsorption experiments demonstrated that the mechanism is governed by hydrophobic interactions, with van der Waals forces as a secondary effect in the adsorption of FLN, DBT and DBF onto HDPE res and HDPE com . Thus, allowing a deeper understanding of the interactions between HDPE MP and FLN as well with its derivatives.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: