Study of the presence of PCDDs/PCDFs on zero-valent iron nanoparticles.
Chemosphere
; 169: 361-368, 2017 Feb.
Article
em En
| MEDLINE
| ID: mdl-27886538
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.
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Base de dados:
MEDLINE
Assunto principal:
Benzofuranos
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Compostos de Ferro
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Nanopartículas Metálicas
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Dibenzodioxinas Policloradas
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Furanos
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Ferro
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article