Back to Search
Start Over
Electroactive properties of EABs in response to long-term exposure to polystyrene microplastics/nanoplastics and the underlying adaptive mechanisms.
- Source :
-
Journal of hazardous materials [J Hazard Mater] 2024 Mar 05; Vol. 465, pp. 133438. Date of Electronic Publication: 2024 Jan 05. - Publication Year :
- 2024
-
Abstract
- Given widespread presence of polystyrene (PS) microplastics/nanoplastics (MPs/NPs), the electroactive responses and adaptation mechanisms of electroactive biofilms (EABs) exposed long-term to PS-containing aquatic environments remain unclear. Therefore, this study investigated the impacts of PS MPs/NPs on electroactivity of EABs. Results found that EABs exhibited delayed formation upon initially exposure but displayed an increased maximum current density (I <subscript>max</subscript> ) after subsequent exposure for up to 55 days. Notably, EABs exposure to NH <subscript>2</subscript> PS NPs (EAB-NH <subscript>2</subscript> PSNPs) demonstrated a 50% higher I <subscript>max</subscript> than the control, along with a 17.84% increase in viability and a 58.10% increase in biomass. The cytochrome c (c-Cyts) content in EAB-NH <subscript>2</subscript> PSNPs rose by 178.35%, benefiting the extracellular electron transfer (EET) of EABs. Moreover, bacterial community assembly indicated the relative abundance of electroactive bacteria increased to 87.56% in EAB-NH <subscript>2</subscript> PSNPs. The adaptability mechanisms of EABs under prolonged exposure to PS MPs/NPs predominantly operate by adjusting viability, EET, and bacterial community assembly, which were further confirmed a positive correlation with I <subscript>max</subscript> through structural equation model. These findings provide deeper insights into long-term effects and mechanisms of MPs/NPs on the electroactive properties of EABs and even functional microorganisms in aquatic ecosystems.<br />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.<br /> (Copyright © 2024 Elsevier B.V. All rights reserved.)
- Subjects :
- Plastics
Ecosystem
Biofilms
Microplastics
Polystyrenes
Subjects
Details
- Language :
- English
- ISSN :
- 1873-3336
- Volume :
- 465
- Database :
- MEDLINE
- Journal :
- Journal of hazardous materials
- Publication Type :
- Academic Journal
- Accession number :
- 38198865
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2024.133438