Hexabromocyclododecane (HBCD) has been listed in Annex A of the Stockholm Convention on Persistent Organic Pollutants (POPs) in 2013, but till now there is a lack of efficient methods for its degradation. In this study, nanoscale zero-valent aluminum (nZVAl), an excellent reductant with a very low redox potential of E(Al/Al) = -1.662 V and strong electron transfer ability, was used to reductively degrade HBCD. Nearly 100% HBCD was degraded within 8 h reaction at 25 °C in ethanol/water (v/v, 50/50) solution without pH adjustment. And about 67% cyclododecatriene (CDT) was obtained, which is the complete debromination product. What's more, the yield of Br could achieve nearly 100% after optimizing conditions. The reaction was strongly promoted by increasing the dosages of nZVAl or decreasing the initial concentration of HBCD. The temperature had the most significant influence and the degradation was completed in 40 min with elevating the reaction temperature to 45 °C. The reaction mechanism was further revealed through the characterization of nZVAl particles before and after the reaction by SEM-EDS, TEM, HRTEM, XRD, and XPS. It was found that, after corrosion of the oxide film on the surface of nZVAl, metallic aluminum inside was exposed. The reactive sites were provided and electrons released were transferred from nZVAl to HBCD, causing HBCD degraded to dibromocyclododecadiene (DBCD) and then CDT by reductive debromination. These findings imply that nZVAl can degrade HBCD efficiently with no extra energy input and this offers a new idea for better treatment of HBCD.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.chemosphere.2019.125536 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A physiologically based pharmacokinetic (PBPK) model describing the kinetics of a commercial mixture α-, β-, and γ-hexabromocyclododecane exposure in mice.
Arch Toxicol
January 2025
Scientist Emeritus, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA.
Hexabromocyclododecane (HBCD) is a brominated flame retardant, that is added, but not chemically bonded, to consumer products. HBCD is sold as a commercial-grade HBCD mixture containing three major stereoisomers: alpha (α), beta (β), and gamma (γ), with relative amounts of 12% for α-HBCD, 6% for β-HBCD, and 82% for γ-HBCD. HBCDs are widely measured in the environment and in biological matrices.
View Article and Find Full Text PDFDevelopment and validation of a robust single extraction method for analysis of PAHs, HBCD, BDE, and PCBs in the coastal environment.
Anal Methods
January 2025
Marine Elements and Marine Environment Division, CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar 364 002, Gujarat, India.
Monitoring persistent organic pollutants (POPs) with endocrine-disrupting properties poses significant analytical challenges due to labor-intensive, costly, and environmentally unsustainable procedures. This study developed an efficient and robust approach for the simultaneous detection of diverse groups of semi-volatile organics in water and sediment samples using gas chromatography-tandem mass spectrometry (GC-MS). Two extraction methods were studied for determining POPs in water and sediments.
View Article and Find Full Text PDFSupramolecular Interface Buffer Layer for Stable Zinc Anode.
Small Methods
January 2025
Science Island Branch of Graduate School University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
The aqueous zinc ion batteries (AZIBs) are chronically plagued by the inevitable side-reaction and uneven Zn planets stack. Through regulating the water activity and Zn crystal dynamics could effectively relieve those anode/electrolyte interface problems. The (2-hydroxypropyl)-β-cyclodextrin (HBCD), characterized by the excluded-volume and mitigating zinc-flux aggregation effect, is chosen as the electrolyte additive to tail the anode/electrolyte interface.
View Article and Find Full Text PDFTranscriptome analysis reveals the different toxic mechanism of three HBCD diastereoisomers to Brachionus plicatilis based on chemical defensome.
J Hazard Mater
January 2025
Department of Marine Ecology, College of Marine Life Sciences, Ocean University of China, No.5 Yushan Road, Qingdao, China; Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, China. Electronic address:
The emerging contaminants hexabromocyclododecanes (HBCDs) are proved to exhibit highly reproductive toxicity to marine rotifer Brachionus plicatilis, but how about the toxic differentiation among three diastereoisomers of HBCD, and what's the possible hidden mechanism? B. plicatilis was exposed to different concentrations of HBCD diastereoisomers, and the results showed that α-, β- and γ-HBCD exhibited various toxicity on it, the adverse effects on individual life history traits included shortened lifespan, shortened body length and reduced offspring number. Population dynamics analysis showed that the maximum population density and time to reach it were also significantly influenced.
View Article and Find Full Text PDFOccurrence and distribution of brominated and fluorinated persistent organic pollutants in surface sediments focusing on industrially affected rivers.
Chemosphere
February 2025
Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Republic of Korea; Institute for Environment and Energy, Pusan National University, Busan, 46241, Republic of Korea. Electronic address:
Article Synopsis
- The study focused on legacy persistent organic pollutants like PBDEs, HBCDs, and PFAS found in sediments from five major rivers, revealing higher contamination levels in areas with industrial activity.
- The predominant compounds detected were decaBDE for PBDEs, γ-HBCD for HBCDs, and PFOS for PFAS, with alternative substances appearing less frequently.
- Overall, while most ecological risk assessment values were low, PBDEs and PFOS posed significant risks at certain sites, indicating a need for ongoing monitoring to protect aquatic ecosystems.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!