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Efficient degradation of hexabromocyclododecane using montmorillonite supported nano-zero-valent iron and Citrobacter sp. Y3. | LitMetric

Efficient degradation of hexabromocyclododecane using montmorillonite supported nano-zero-valent iron and Citrobacter sp. Y3.

J Hazard Mater

School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China. Electronic address:

Published: September 2023

AI Article Synopsis

  • - The study explores the combination of modified nanoscale zero-valent iron (nZVI) with organohalide-degrading bacteria to remediate environments contaminated with hexabromocyclododecane (HBCD), identifying complex interactions and the need for further research into their mechanisms.
  • - It demonstrates that the nZVI/OMt-Y3 combination can completely degrade HBCD into carbon dioxide within about 5 days, primarily through three pathways: dehydrobromination, hydroxylation, and debromination.
  • - The research employs various analytical techniques to confirm electron transport and proposes a metabolic mechanism for HBCD degradation, paving the way for future studies on the remediation of HBCD and similar pollutants.

Article Abstract

The coupling of modified nanoscale zero-valent iron (nZVI) with organohalide-degrading bacteria provides a promising solution for the remediation of hexabromocyclododecane (HBCD)-contaminated environments. However, the interactions between modified nZVI and dehalogenase bacteria are intricate, and the mechanisms of synergistic action and electron transfer are not clear, and requires further specific investigation. In this study, HBCD was used as a model pollutant, and stable isotope analysis revealed that organic montmorillonite (OMt)-supported nZVI coupled with the degrading bacterial strain Citrobacter sp. Y3 (nZVI/OMt-Y3) can use [C]HBCD as the sole carbon source and degrade or even mineralise it into CO with a maximum conversion rate of 100% within approximately 5 days. Analysis of the intermediates showed that the degradation of HBCD mainly involves three different pathways: dehydrobromination, hydroxylation, and debromination. The proteomics results showed that nZVI introduction promoted the transport of electrons and debromination. Combining the results from XPS, FTIR, and Raman spectroscopy with the analysis results of proteinomics and biodegradation products, we verified the process of electron transport and proposed a metabolic mechanism of HBCD degradation by the nZVI/OMt-Y3. Moreover, this study provides insightful avenues and models for the further remediation of HBCD and other similar pollutants in the environment.

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Source
http://dx.doi.org/10.1016/j.jhazmat.2023.131739DOI Listing

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