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Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems

The formation of plastisphere on plastics and their potential impact on freshwater ecosystems have drawn increasing attention. However, there is still limited information about the effects of plastisphere on the heavy metal adsorption capacity and the related mechanism of plastic debris in different...

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Autores principales: Liu, Zhilin, Adyel, Tanveer M., Wang, Zhiyuan, Wu, Jun, Liu, Jianchao, Miao, Lingzhan, Hou, Jun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9658614/
https://www.ncbi.nlm.nih.gov/pubmed/36360635
http://dx.doi.org/10.3390/ijerph192113752
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author Liu, Zhilin
Adyel, Tanveer M.
Wang, Zhiyuan
Wu, Jun
Liu, Jianchao
Miao, Lingzhan
Hou, Jun
author_facet Liu, Zhilin
Adyel, Tanveer M.
Wang, Zhiyuan
Wu, Jun
Liu, Jianchao
Miao, Lingzhan
Hou, Jun
author_sort Liu, Zhilin
collection PubMed
description The formation of plastisphere on plastics and their potential impact on freshwater ecosystems have drawn increasing attention. However, there is still limited information about the effects of plastisphere on the heavy metal adsorption capacity and the related mechanism of plastic debris in different freshwaters. Herein, the trace metal adsorption capacity, kinetics and adsorption mechanisms of virgin and biofilm-covered plastic debris were investigated. Polypropylene (PP) and polyethylene terephthalate (PET) plastic debris were placed in three freshwaters (Xuanwu Lake, Donghu Lake and the Qinhuai River) for 45 days to incubate biofilms. Batch adsorption experiments were performed to compare the adsorption processes of trace metal on virgin and biofilm-covered plastics. Results showed that biofilms increase the adsorption of metals on plastics, and the adsorption isotherms were well fitted by the Langmuir model. Furthermore, the adsorption capacities for lead (Pb(II)) were higher than that of cadmium (Cd(II)) and zinc (Zn(II)), with 256.21 and 277.38 μg/g (Pb(II)) adsorbed in biofilm-covered PP and PET, respectively, in Xuanwu Lake. The adsorption kinetics of metals on plastic debris were significantly affected by the biofilms, by switching the intraparticle diffusion for virgin plastic debris to film diffusion for the biofilm-covered plastic debris. Moreover, the complexation of functional groups within the biofilms might mainly contribute to the increases of metal adsorption, involving the participation of oxygen and nitrogen groups. Overall, these results suggested that biofilms reinforce the potential role of plastics as a carrier of trace metals in freshwaters.
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spelling pubmed-96586142022-11-15 Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems Liu, Zhilin Adyel, Tanveer M. Wang, Zhiyuan Wu, Jun Liu, Jianchao Miao, Lingzhan Hou, Jun Int J Environ Res Public Health Article The formation of plastisphere on plastics and their potential impact on freshwater ecosystems have drawn increasing attention. However, there is still limited information about the effects of plastisphere on the heavy metal adsorption capacity and the related mechanism of plastic debris in different freshwaters. Herein, the trace metal adsorption capacity, kinetics and adsorption mechanisms of virgin and biofilm-covered plastic debris were investigated. Polypropylene (PP) and polyethylene terephthalate (PET) plastic debris were placed in three freshwaters (Xuanwu Lake, Donghu Lake and the Qinhuai River) for 45 days to incubate biofilms. Batch adsorption experiments were performed to compare the adsorption processes of trace metal on virgin and biofilm-covered plastics. Results showed that biofilms increase the adsorption of metals on plastics, and the adsorption isotherms were well fitted by the Langmuir model. Furthermore, the adsorption capacities for lead (Pb(II)) were higher than that of cadmium (Cd(II)) and zinc (Zn(II)), with 256.21 and 277.38 μg/g (Pb(II)) adsorbed in biofilm-covered PP and PET, respectively, in Xuanwu Lake. The adsorption kinetics of metals on plastic debris were significantly affected by the biofilms, by switching the intraparticle diffusion for virgin plastic debris to film diffusion for the biofilm-covered plastic debris. Moreover, the complexation of functional groups within the biofilms might mainly contribute to the increases of metal adsorption, involving the participation of oxygen and nitrogen groups. Overall, these results suggested that biofilms reinforce the potential role of plastics as a carrier of trace metals in freshwaters. MDPI 2022-10-22 /pmc/articles/PMC9658614/ /pubmed/36360635 http://dx.doi.org/10.3390/ijerph192113752 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liu, Zhilin
Adyel, Tanveer M.
Wang, Zhiyuan
Wu, Jun
Liu, Jianchao
Miao, Lingzhan
Hou, Jun
Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems
title Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems
title_full Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems
title_fullStr Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems
title_full_unstemmed Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems
title_short Effects of Biofilms on Trace Metal Adsorption on Plastics in Freshwater Systems
title_sort effects of biofilms on trace metal adsorption on plastics in freshwater systems
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9658614/
https://www.ncbi.nlm.nih.gov/pubmed/36360635
http://dx.doi.org/10.3390/ijerph192113752
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