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Influence of polymer type and carbon nanotube properties on carbon nanotube/polymer nanocomposite biodegradation.
Frank, Benjamin P; Goodwin, David G; Bohutskyi, Pavlo; Phan, Duc C; Lu, Xier; Kuwama, Leo; Bouwer, Edward J; Fairbrother, D Howard.
Afiliación
  • Frank BP; Department of Chemistry, Johns Hopkins University, 3400 N Charles St., Baltimore, MD 21218, United States.
  • Goodwin DG; Department of Chemistry, Johns Hopkins University, 3400 N Charles St., Baltimore, MD 21218, United States.
  • Bohutskyi P; Biological Sciences Division, Pacific Northwest National Laboratory, 3300 Stevens Dr., Richland, Washington 99354, United States.
  • Phan DC; Department of Environmental Health and Engineering, Johns Hopkins University, 3400 N Charles St., Baltimore, MD 21218, United States; Department of Civil and Environmental Engineering, The University of Texas at San Antonio, 1 UTSA Circle, San Antonio, TX 78249, United States.
  • Lu X; Department of Environmental Health and Engineering, Johns Hopkins University, 3400 N Charles St., Baltimore, MD 21218, United States.
  • Kuwama L; Department of Environmental Health and Engineering, Johns Hopkins University, 3400 N Charles St., Baltimore, MD 21218, United States.
  • Bouwer EJ; Department of Environmental Health and Engineering, Johns Hopkins University, 3400 N Charles St., Baltimore, MD 21218, United States.
  • Fairbrother DH; Department of Chemistry, Johns Hopkins University, 3400 N Charles St., Baltimore, MD 21218, United States. Electronic address: howardf@jhu.edu.
Sci Total Environ ; 742: 140512, 2020 Nov 10.
Article en En | MEDLINE | ID: mdl-32721719
The interaction of anaerobic microorganisms with carbon nanotube/polymer nanocomposites (CNT/PNC) will play a major role in determining their persistence and environmental fate at the end of consumer use when these nano-enabled materials enter landfills and encounter wastewater. Motivated by the need to understand how different parameters (i.e., polymer type, microbial phenotype, CNT characteristics) influence CNT/PNC biodegradation rates, we have used volumetric biogas measurements and kinetic modeling to study biodegradation as a function of polymer type and CNT properties. In one set of experiments, oxidized multiwall carbon nanotubes (O-MWCNTs) with a range of CNT loadings 0-5% w/w were incorporated into poly-ε-caprolactone (PCL) and polyhydroxyalkanoates (PHA) matrices and subjected to biodegradation by an anaerobic microbial community. For each CNT/PNC, complete polymer biodegradation was ultimately observed, although the rate of biodegradation was inhibited above certain critical CNT loadings dependent upon the polymer type. Higher loadings of pristine MWCNTs were needed to decrease the rate of polymer biodegradation compared to O-MWCNTs, an effect ascribed principally to differences in CNT dispersion within the polymer matrices. Above certain CNT loadings, a CNT mat of similar shape to the initial PNC was formed after polymer biodegradation, while below this threshold, CNT aggregates fragmented in the media. In situations where biodegradation was rapid, methanogen growth was disproportionately inhibited compared to the overall microbial community. Analysis of the results obtained from this study indicates that the inhibitory effect of CNTs on polymer biodegradation rate is greatest under conditions (i.e., polymer type, microbial phenotype, CNT dispersion) where biodegradation of the neat polymer is slowest. This new insight provides a means to predict the environmental fate, persistence, and transformations of CNT-enabled polymer materials.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Nanotubos de Carbono / Nanocompuestos Tipo de estudio: Prognostic_studies Idioma: En Revista: Sci Total Environ Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Nanotubos de Carbono / Nanocompuestos Tipo de estudio: Prognostic_studies Idioma: En Revista: Sci Total Environ Año: 2020 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Países Bajos