Study of the presence of PCDDs/PCDFs on zero-valent iron nanoparticles

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Title: Study of the presence of PCDDs/PCDFs on zero-valent iron nanoparticles
Authors: Calderón Roca, Blanca | Lundin, Lisa | Aracil, Ignacio | Fullana, Andres
Research Group/s: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química
Keywords: Toxicity | PCDD/F | Nanoparticles | nZVI | Iron chloride
Knowledge Area: Ingeniería Química
Issue Date: Feb-2017
Publisher: Elsevier
Citation: Chemosphere. 2017, 169: 361-368. doi:10.1016/j.chemosphere.2016.11.074
Abstract: Studies show that nanoscale zero-valent iron (nZVI) particles enhance the formation of chlorinated compounds such as polychlorinated dioxins and furans (PCDD/Fs) during thermal processes. However, it is unclear whether nZVI acts as a catalyst for the formation of these compounds or contains impurities, such as PCDD/Fs, within its structure. We analyzed the presence of PCDD/Fs in nZVI particles synthesized through various production methods to elucidate this uncertainty. None of the 2,3,7,8-substituted congeners were found in the commercially-produced nZVI, but they were present in the laboratory-synthesized nZVI produced through the borohydride method, particularly in particles synthesized from iron (III) chloride rather than from iron sulfate. Total PCDD/F WHO-TEQ concentrations of up to 35 pg/g were observed in nZVI particles, with hepta- and octa-chlorinated congeners being the most abundant. The reagents used in the borohydride method were also analyzed, and our findings suggest that FeCl3 effectively contains PCDD/Fs at concentrations that could explain the concentrations observed in the nZVI product. Both FeCl3 and nZVI showed a similar PCDD/F patterns with slight differences. These results suggest that PCDD/Fs might transfer from FeCl3 to nZVI during the production method, and thus, care should be taken when employing certain nZVI for environmental remediation.
Sponsor: We would like to acknowledge the University of Alicante (EEBB-UA2013) for financing this study.
ISSN: 0045-6535 (Print) | 1879-1298 (Online)
DOI: 10.1016/j.chemosphere.2016.11.074
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier Ltd.
Peer Review: si
Publisher version:
Appears in Collections:INV - REMAN - Artículos de Revistas

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