DOI: 10.1016/j.watres.2018.12.017
Scopus记录号: 2-s2.0-85059147336
论文题名: Releases of brominated flame retardants (BFRs) from microplastics in aqueous medium: Kinetics and molecular-size dependence of diffusion
作者: Sun B. ; Hu Y. ; Cheng H. ; Tao S.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 215
结束页码: 225
语种: 英语
英文关键词: Activation energy
; Aquatic environment
; Brominated flame retardants (BFRs)
; Diffusion coefficient
; Microplastic
; Release kinetics
Scopus关键词: ABS resins
; Activation energy
; Flame retardants
; Glass transition
; Kinetics
; Leaching
; Organic pollutants
; Pelletizing
; Styrene
; Temperature distribution
; Water quality
; 1 ,2-bis(2 ,4 ,6-tribromophenoxy) ethane
; Acrylonitrile butadiene styrene
; Apparent activation energy
; Aquatic environments
; Brominated flame retardants (BFRs)
; Microplastic
; Polybrominated diphenyl ether (PBDEs)
; Release kinetics
; Diffusion
; acrylonitrile
; flame retardant
; plastic
; polybrominated diphenyl ether
; styrene derivative
; activation energy
; aqueous solution
; diffusion
; equation
; flame retardant
; leaching
; marine environment
; molecular analysis
; plastic waste
; reaction kinetics
; water quality
; Article
; bromination
; chemical structure
; diffusion
; environmental temperature
; glass transition temperature
; leaching
; marine environment
; priority journal
; stereospecificity
; temperature dependence
英文摘要: Microplastics (<5 mm) are increasingly detected in aquatic environment, and the high levels of brominated flame retardants (BFRs) contained in them can potentially impact water quality. This study characterized the release kinetics of polybrominated diphenyl ethers (PBDEs) and 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE) from millimeter-sized microplastic pellets in water at environmentally relevant temperatures. Leaching rates of BFRs from the microplastic pellets made of acrylonitrile butadiene styrene (ABS) were found to be controlled by their diffusion within the plastic matrix, and their diffusion coefficients (D) in the plastic matrices ranged from 10−28.30 to 10−20.84 m2 s−1. The apparent activation energies of the BFRs’ diffusion coefficients were estimated to be in the range of 64.1–131.8 kJ mol−1 based on their temperature dependence and the Arrhenius equation. The diffusion coefficients of the BFRs decrease with their molecular diameters, while the activation energies for diffusion increase with the molecular diameters, which are indicative of significant steric hindrance for BFR diffusion within the plastic matrices. A semi-empirical linear relationship was observed between Log10D and the glass transition temperature (Tg) of plastics, which allows prediction of the diffusion coefficients of BFRs in other types of microplastics commonly found in marine environment. The half-lives of BFR leaching (i.e., 50% depletion) from the microplastic pellets would range from tens of thousands to hundreds of billions of years at ambient temperatures if their physical and chemical structures could remain intact. Although the release fluxes of BFRs from microplastics are extremely low under the model conditions, a range of physical and chemical processes in the natural environment and the digestive systems of organisms that ingested them could potentially accelerate their leaching by causing breakdown and swelling of the plastic matrices. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122055
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; MOE Laboratory of Groundwater Circulation and Evolution, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, China; MOE Key Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China
Recommended Citation:
Sun B.,Hu Y.,Cheng H.,et al. Releases of brominated flame retardants (BFRs) from microplastics in aqueous medium: Kinetics and molecular-size dependence of diffusion[J]. Water Research,2019-01-01