A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases

The development of treatment trains for pollutant degradation employing zerovalent iron has been attracting a lot of interest in the last few years. This approach consists of pre-treatment only with zerovalent iron, followed by a Fenton oxidation taking advantage of the iron ions released in the fir...

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Autores principales:	Iván Sciscenko, Antonio Arques, Carlos Escudero-Oñate, Melina Roccamante, Ana Ruiz-Delgado, Sara Miralles-Cuevas, Sixto Malato, Isabel Oller
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Fenton reaction heterogeneous catalysis pollutant reactivity enhancement contaminants of emerging concern zerovalent iron Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/1df595368ce24e41a64b0b5e2b409e83
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spelling	oai:doaj.org-article:1df595368ce24e41a64b0b5e2b409e832021-11-25T18:31:05ZA Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases10.3390/nano111129482079-4991https://doaj.org/article/1df595368ce24e41a64b0b5e2b409e832021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2948https://doaj.org/toc/2079-4991The development of treatment trains for pollutant degradation employing zerovalent iron has been attracting a lot of interest in the last few years. This approach consists of pre-treatment only with zerovalent iron, followed by a Fenton oxidation taking advantage of the iron ions released in the first step. In this work, the advantages/disadvantages of this strategy were studied employing commercial zerovalent iron microparticles (mZVI). The effect of the initial amount of mZVI, H<sub>2</sub>O<sub>2</sub>, pH, conductivity, anions and dissolved oxygen were analysed using <i>p</i>-nitrobenzoic acid (PNBA) as model pollutant. 83% reduction of PNBA 6 µM into <i>p</i>-aminobenzoic acid (PABA) was achieved in natural water at an initial pH 3.0 and 1.4 g/L of mZVI, under aerobic conditions, in 2 h. An evaluation of the convenience of removing mZVI after the reductive phase before the Fenton oxidation was investigated together with mZVI reusability. The Fenton step against the more reactive PABA required 50 mg/L of H<sub>2</sub>O<sub>2</sub> to achieve more than 96% removal in 15 min at pH 7.5 (final pH from the reductive step). At least one complete reuse cycle (reduction/oxidation) was achieved with the separated mZVI. This approach might be interesting to treat wastewater containing pollutants initially resistant to hydroxyl radicals.Iván SciscenkoAntonio ArquesCarlos Escudero-OñateMelina RoccamanteAna Ruiz-DelgadoSara Miralles-CuevasSixto MalatoIsabel OllerMDPI AGarticleFenton reactionheterogeneous catalysispollutant reactivity enhancementcontaminants of emerging concernzerovalent ironChemistryQD1-999ENNanomaterials, Vol 11, Iss 2948, p 2948 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Fenton reaction heterogeneous catalysis pollutant reactivity enhancement contaminants of emerging concern zerovalent iron Chemistry QD1-999
spellingShingle	Fenton reaction heterogeneous catalysis pollutant reactivity enhancement contaminants of emerging concern zerovalent iron Chemistry QD1-999 Iván Sciscenko Antonio Arques Carlos Escudero-Oñate Melina Roccamante Ana Ruiz-Delgado Sara Miralles-Cuevas Sixto Malato Isabel Oller A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases
description	The development of treatment trains for pollutant degradation employing zerovalent iron has been attracting a lot of interest in the last few years. This approach consists of pre-treatment only with zerovalent iron, followed by a Fenton oxidation taking advantage of the iron ions released in the first step. In this work, the advantages/disadvantages of this strategy were studied employing commercial zerovalent iron microparticles (mZVI). The effect of the initial amount of mZVI, H<sub>2</sub>O<sub>2</sub>, pH, conductivity, anions and dissolved oxygen were analysed using <i>p</i>-nitrobenzoic acid (PNBA) as model pollutant. 83% reduction of PNBA 6 µM into <i>p</i>-aminobenzoic acid (PABA) was achieved in natural water at an initial pH 3.0 and 1.4 g/L of mZVI, under aerobic conditions, in 2 h. An evaluation of the convenience of removing mZVI after the reductive phase before the Fenton oxidation was investigated together with mZVI reusability. The Fenton step against the more reactive PABA required 50 mg/L of H<sub>2</sub>O<sub>2</sub> to achieve more than 96% removal in 15 min at pH 7.5 (final pH from the reductive step). At least one complete reuse cycle (reduction/oxidation) was achieved with the separated mZVI. This approach might be interesting to treat wastewater containing pollutants initially resistant to hydroxyl radicals.
format	article
author	Iván Sciscenko Antonio Arques Carlos Escudero-Oñate Melina Roccamante Ana Ruiz-Delgado Sara Miralles-Cuevas Sixto Malato Isabel Oller
author_facet	Iván Sciscenko Antonio Arques Carlos Escudero-Oñate Melina Roccamante Ana Ruiz-Delgado Sara Miralles-Cuevas Sixto Malato Isabel Oller
author_sort	Iván Sciscenko
title	A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases
title_short	A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases
title_full	A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases
title_fullStr	A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases
title_full_unstemmed	A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases
title_sort	rational analysis on key parameters ruling zerovalent iron-based treatment trains: towards the separation of reductive from oxidative phases
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1df595368ce24e41a64b0b5e2b409e83
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A Rational Analysis on Key Parameters Ruling Zerovalent Iron-Based Treatment Trains: Towards the Separation of Reductive from Oxidative Phases

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