Mechanisms of 4-phenylazophenol elimination in micro- And nano-ZVI assisted-Fenton systems

The 4-phenylazophenol (4-PAP), was treated with two different sources of metallic iron (ZVI): commercial micrometric powder (pZVI) and nanoparticles synthetized by the borohydride reduction method (nZVI). 4-PAP degradation was studied both in the absence and in the presence of H₂O₂ at different pHs....

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Autores principales: Donadelli, Jorge Andrés, Caram, Bruno Federico, Kalaboka, Maria, Kapsi, Margarita, Sakkas, Vasilios A., Carlos, Luciano, García Einschlag, Fernando Sebastián
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Ingeniería Química
Zvi
Fenton
Azo dyes
Iron nanoparticles
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/145957
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-145957
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería Química
Zvi
Fenton
Azo dyes
Iron nanoparticles
spellingShingle Ingeniería Química
Zvi
Fenton
Azo dyes
Iron nanoparticles
Donadelli, Jorge Andrés
Caram, Bruno Federico
Kalaboka, Maria
Kapsi, Margarita
Sakkas, Vasilios A.
Carlos, Luciano
García Einschlag, Fernando Sebastián
Mechanisms of 4-phenylazophenol elimination in micro- And nano-ZVI assisted-Fenton systems
topic_facet Ingeniería Química
Zvi
Fenton
Azo dyes
Iron nanoparticles
description The 4-phenylazophenol (4-PAP), was treated with two different sources of metallic iron (ZVI): commercial micrometric powder (pZVI) and nanoparticles synthetized by the borohydride reduction method (nZVI). 4-PAP degradation was studied both in the absence and in the presence of H₂O₂ at different pHs. The degradation products of 4-PAP in each treatment were followed by LC-MS and CG-MS. Results showed that, in the absence of H2O2, the azo bond reduction of 4-PAP with the formation of amines was the main mechanism involved for both ZVI sources and nZVI exhibited a faster substrate removal than pZVI. In the presence of H₂O₂, an additional mechanism involving the oxidation mediated by hydroxyl radicals takes place. For pZVI, the addition of H₂O₂ produced a complete inhibition of the reduction pathway, being the oxidation the main degradation mechanism. In the case of nZVI, the system behavior showed an important dependence on the working pH. At pH 3.00, oxidative transformation pathways prevailed, whereas at pH 5.00 an almost negligible degradation -mainly driven by 4-PAP reduction- was observed. The assessment of the involved reaction mechanisms under different conditions allows the selection of the most suitable source for a specific treatment.
format Articulo
Articulo
author Donadelli, Jorge Andrés
Caram, Bruno Federico
Kalaboka, Maria
Kapsi, Margarita
Sakkas, Vasilios A.
Carlos, Luciano
García Einschlag, Fernando Sebastián
author_facet Donadelli, Jorge Andrés
Caram, Bruno Federico
Kalaboka, Maria
Kapsi, Margarita
Sakkas, Vasilios A.
Carlos, Luciano
García Einschlag, Fernando Sebastián
author_sort Donadelli, Jorge Andrés
title Mechanisms of 4-phenylazophenol elimination in micro- And nano-ZVI assisted-Fenton systems
title_short Mechanisms of 4-phenylazophenol elimination in micro- And nano-ZVI assisted-Fenton systems
title_full Mechanisms of 4-phenylazophenol elimination in micro- And nano-ZVI assisted-Fenton systems
title_fullStr Mechanisms of 4-phenylazophenol elimination in micro- And nano-ZVI assisted-Fenton systems
title_full_unstemmed Mechanisms of 4-phenylazophenol elimination in micro- And nano-ZVI assisted-Fenton systems
title_sort mechanisms of 4-phenylazophenol elimination in micro- and nano-zvi assisted-fenton systems
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/145957
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