Zero-valent iron nanoparticles entrapped in SiO2 sol-gel matrices: A catalyst for the reduction of several pollutants

Neelam; Dan Meyerstein; Jaydeep Adhikary; Ariela Burg; Dror Shamir; Yael Albo

doi:10.1016/j.catcom.2019.105819

Zero-valent iron nanoparticles entrapped in SiO₂ sol-gel matrices: A catalyst for the reduction of several pollutants

Neelam, Dan Meyerstein, Jaydeep Adhikary, Ariela Burg, Dror Shamir, Yael Albo

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Zero-valent iron-nanoparticles (ZVI-NPs) entrapped in silica matrices through a sol-gel procedure are investigated as redox catalysts with BH₄⁻ (NaBH₄) as the reducing agent. The results indicated that the matrix functions as an efficient and multifunctional catalyst for the reduction of halo-acetic acids (HAAs), [BrO₃⁻] and 4-nitrophenol pollutants present in the contaminated water. The present study revealed that the reduction mechanism depends on the nature of the substrate, M⁰ used and the rate of the reductant addition (batch mode reactor system). The novelty of the present work is double-fold: First, in pointing out that the mechanism of the catalytic de-halogenation reaction depends on the nature of M⁰-NPs used as a catalyst, probably due to the different over-potential for the HER reaction on each M⁰-NPs and second, the development of a cost-effective remediation alternative compared to the analogous Au⁰-NPs or Ag⁰-NPs catalysts reported in the literature.

Original language	English
Article number	105819
Journal	Catalysis Communications
Volume	133
DOIs	https://doi.org/10.1016/j.catcom.2019.105819
State	Published - 5 Jan 2020

Bibliographical note

Publisher Copyright:
© 2019

Funding

This work was supported in part by a grant received from the PAZY foundation . Neelam would like to thank Ariel University for receiving a fellowship during her PhD studies. Authors are indebted to Onmaterials for their generous donation of the ZVI-NPs that were used herein.

Funders	Funder number
PAZY Foundation
Ariel University

Keywords

De-halogenation
Halo-acetic acids
Reduction catalyst
Sol-gel
Zero-valent iron

Access to Document

10.1016/j.catcom.2019.105819

Cite this

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title = "Zero-valent iron nanoparticles entrapped in SiO2 sol-gel matrices: A catalyst for the reduction of several pollutants",

abstract = "Zero-valent iron-nanoparticles (ZVI-NPs) entrapped in silica matrices through a sol-gel procedure are investigated as redox catalysts with BH4− (NaBH4) as the reducing agent. The results indicated that the matrix functions as an efficient and multifunctional catalyst for the reduction of halo-acetic acids (HAAs), [BrO3−] and 4-nitrophenol pollutants present in the contaminated water. The present study revealed that the reduction mechanism depends on the nature of the substrate, M0 used and the rate of the reductant addition (batch mode reactor system). The novelty of the present work is double-fold: First, in pointing out that the mechanism of the catalytic de-halogenation reaction depends on the nature of M0-NPs used as a catalyst, probably due to the different over-potential for the HER reaction on each M0-NPs and second, the development of a cost-effective remediation alternative compared to the analogous Au0-NPs or Ag0-NPs catalysts reported in the literature.",

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AB - Zero-valent iron-nanoparticles (ZVI-NPs) entrapped in silica matrices through a sol-gel procedure are investigated as redox catalysts with BH4− (NaBH4) as the reducing agent. The results indicated that the matrix functions as an efficient and multifunctional catalyst for the reduction of halo-acetic acids (HAAs), [BrO3−] and 4-nitrophenol pollutants present in the contaminated water. The present study revealed that the reduction mechanism depends on the nature of the substrate, M0 used and the rate of the reductant addition (batch mode reactor system). The novelty of the present work is double-fold: First, in pointing out that the mechanism of the catalytic de-halogenation reaction depends on the nature of M0-NPs used as a catalyst, probably due to the different over-potential for the HER reaction on each M0-NPs and second, the development of a cost-effective remediation alternative compared to the analogous Au0-NPs or Ag0-NPs catalysts reported in the literature.

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