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New Trends in Heterogeneous Fenton Catalysts
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New Trends in Heterogeneous Fenton Catalysts

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalysis in Organic and Polymer Chemistry".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 4193

Special Issue Editor

Dr. Nasr Bensalah

E-Mail Website
Guest Editor
Chemistry Program, Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, PO Box 2713, Doha, Qatar
Interests: electrochemical and chemical methods for energy and environment

Special Issue Information

Dear Colleagues,

The Fenton process has gained substantial interest in water and soil treatment applications due to its ability to degrade pollutants at great efficiencies through the in situ generation of hydroxyl radicals (·OH). In the classic Fenton process, the catalytic decomposition of hydrogen peroxide (H2O2) by ferrous iron (Fe2+) produces ·OH radicals. However, high amounts of Fe2+ are needed to attain complete removal of pollutants due to the slowness of Fe2+ regeneration. The heterogeneous Fenton process involves the reaction of H2O2 with a solid Fe(II)-containing catalyst, which produces ·OH radicals on the surface for the complete mineralization or oxidation of pollutants into smaller compounds. The Fenton process is believed to be a more cost-effective technology than other AOPs, as the process utilizes low-cost Fe-based catalysts and can be coupled with solar energy (photo-Fenton) to accelerate the recovery of Fe(II) from Fe(III) in the catalyst. With recent advancements in research, novel iron-based catalysts, such as nanoscale zero-valent iron (nZVI), multi-metal compounds, and composites containing zeolite, carbon-based compounds, clays, and metal-organic frameworks (MOF) as supporting materials, have been developed for Fenton-based processes. In addition, non-iron-based catalysts have also been shown to be effective in pollutant degradation via Fenton-like reactions, including Ce-, Cr-, Cu-, Mn-, and Ni-based materials. This Special Issue will focus on experimental and theoretical investigations of novel heterogeneous Fenton catalysts with ideal properties, such as enhanced catalytic activities (nZVI), stability (MOF, supported catalysts), conductivity (carbon-based support), reusability (supported catalysts), and a wider pH range of activity (non-iron-based materials) compared to conventional heterogeneous Fenton catalysts.

Dr. Nasr Bensalah
Guest Editor

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Keywords

  • heterogeneous Fenton catalysts: synthesis and characterization.
  • homogeneous and heterogeneous Fenton processes: comparison
  • enhanced catalytic activity in heterogeneous Fenton process
  • supported Fenton catalysts - MOFs and MXene as Fenton catalysts
  • carbon-based support for Fenton catalysts
  • natural heterogeneous Fenton catalysts
  • pH-independent Fenton catalysts
  • non-iron-based Fenton catalysts
  • heterogeneous photo-Fenton
  • heterogeneous electro-Fenton

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Published Papers (1 paper)

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Research

15 pages, 4299 KiB  
Article
Mineralization of Riluzole by Heterogeneous Fenton Oxidation Using Natural Iron Catalysts
by Nasr Bensalah, Emna Neily, Ahmed Bedoui and Mohammad I. Ahmad
Catalysts 2023, 13(1), 68; https://doi.org/10.3390/catal13010068 - 30 Dec 2022
Cited by 5 | Viewed by 2426
Abstract
Fenton (H2O2/Fe2+) system is a simple and efficient advanced oxidation technology (AOT) for the treatment of organic micropollutants in water and soil. However, it suffers from some drawbacks including high amount of the catalyst, acid pH requirement, [...] Read more.
Fenton (H2O2/Fe2+) system is a simple and efficient advanced oxidation technology (AOT) for the treatment of organic micropollutants in water and soil. However, it suffers from some drawbacks including high amount of the catalyst, acid pH requirement, sludge formation and slow regeneration of Fe2+ ions. If these drawbacks are surmounted, Fenton system can be the best choice AOT for the removal of persistent organics from water and soil. In this work, it was attempted to replace the homogeneous catalyst with a heterogeneous natural iron-based catalyst for the decomposition of H2O2 into oxidative radical species, mainly hydroxyl (HO•) and hydroperoxyl radicals (HO2•). The natural iron-based catalyst is hematite-rich (α-Fe2O3) and contains a nonnegligible amount of magnetite (Fe3O4) indicating the coexistence of Fe (III) and Fe(II) species. A pseudo-first order kinetics was determined for the decomposition of H2O2 by the iron-based solid catalyst with a rate constant increasing with the catalyst dose. The catalytic decomposition of H2O2 into hydroxyl radicals in the presence of the natural Fe-based catalyst was confirmed by the hydroxylation of benzoic acid into salicylic acid. The natural Fe-based catalyst/H2O2 system was applied for the degradation of riluzole in water. It was demonstrated that the smaller the particle size of the catalyst, the larger its surface area and the greater its catalytic activity towards H2O2 decomposition into hydroxyl radicals. The degradation of riluzole can occur at all pH levels in the range 3.0–12.0 with a rate and efficiency greater than H2O2 oxidation alone, indicating that the natural Fe-based catalyst can function at any pH without the need to control the pH by the addition of chemicals. An improvement in the efficiency and kinetics of the degradation of riluzole was observed under UV irradiation for both homogeneous and heterogeneous Fenton systems. The results chromatography analysis demonstrate that the degradation of riluzole starts by the opening of the triazole ring by releasing nitrate, sulfate, and fluoride ions. The reuse of the catalyst after heat treatment at 500 °C demonstrated that the heat-treated catalyst retained an efficiency >90% after five cycles. The results confirmed that the natural sources of iron, as a heterogeneous catalyst in a Fenton-like system, is an appropriate replacement of a Fe2+ homogeneous catalyst. The reuse of the heterogeneous catalyst after a heat-treatment represents an additional advantage of using a natural iron-based catalyst in Fenton-like systems. Full article
(This article belongs to the Special Issue New Trends in Heterogeneous Fenton Catalysts)
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