A review on the use of chelating agents as an alternative to promote photo-Fenton at neutral pH: Current trends, knowledge gap and future studies

Ahile, Ungwanen J.; Wuana, R. A.; Itodo, A. U.; Sha’Ato, Rufus; Dantas, Renato F.

doi:10.1016/j.scitotenv.2019.134872

Cited by 140 publications

(68 citation statements)

References 127 publications

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“…]. Without irradiation, the mechanism of the Fenton‐like reaction with copper to produce reactive oxidants HO ⋅ can be sumarized as follows, in which regeneration of Cu 2+ thanks to reaction (6) is slower than its consumption as discussed in the Introduction for iron: [20, 21]

true Cu^{2 +}_{(aq)} + normalH_{2} normalO_{2} \to Cu^{+}_{(aq)} + HO_{2}^{•} + normalH^{+}

true HO_{2}^{•} \to normalO_{2}^{•}^{-} + normalH^{+}

true Cu^{2 +}_{(aq)} + normalO_{2}^{•}^{-} (or HO_{2}^{•}) \to Cu^{+}_{(aq)} + normalO_{2} (or O_{2} + H^{+})

true Cu^{+}_{(aq)} + normalH_{2} normalO_{2} \to Cu^{2 +}_{(aq)} + OH^{-}_{(aq)} + HO^{•}

…”

Section: Resultsmentioning

confidence: 99%

Copper‐Based Hybrid Polyion Complexes for Fenton‐Like Reactions

Mestivier

Camy

et al. 2020

Chemistry A European J

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An innovative strategy allowing the development of a new generation of easy‐to‐prepare and easy‐to‐use nano‐sized catalysts with high tenability is presented. This strategy is based on the formation of hybrid polyion complexes (HPICs) from the complexation of copper with a block copolymer consisting of an ionizable complexing block and a neutral stabilizer block. These complexes have a well‐defined structure and size with a hydrodynamic diameter around 29 nm. They are stable in aqueous solution over a pH range from 4 to 8 and are not sensitive to NaCl salt addition or dilution effects. As a proof‐of‐concept the degradation of naphthol blue black in water through the use of the Fenton or photo‐Fenton reaction is studied. Their performances are comparable to a classical homogeneous reaction, whereas HPICs are easily recyclable by simple dialysis.

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true Cu^{2 +}_{(aq)} + normalH_{2} normalO_{2} \to Cu^{+}_{(aq)} + HO_{2}^{•} + normalH^{+}

true HO_{2}^{•} \to normalO_{2}^{•}^{-} + normalH^{+}

true Cu^{2 +}_{(aq)} + normalO_{2}^{•}^{-} (or HO_{2}^{•}) \to Cu^{+}_{(aq)} + normalO_{2} (or O_{2} + H^{+})

true Cu^{+}_{(aq)} + normalH_{2} normalO_{2} \to Cu^{2 +}_{(aq)} + OH^{-}_{(aq)} + HO^{•}

…”

Section: Resultsmentioning

confidence: 99%

Copper‐Based Hybrid Polyion Complexes for Fenton‐Like Reactions

Mestivier

Camy

et al. 2020

Chemistry A European J

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“…Optimal pH keeps iron soluble to interact with hydrogen peroxide and continue the reaction (Ahile et al, 2020). In Figure 2 is observed that the values of pH 3 and 4 are more efficient in the removal of color and COD than the leachates treated with pH 2, as mentioned in the literature for Fenton process (Wang et al, 2020).…”

Section: Optimization Of the Fenton Processmentioning

confidence: 59%

Fenton-adsorption process for leachates from two landfills (karstic-clays)

San-Pedro

Méndez-Novelo²,

Hernández‐Núñez³

et al. 2021

RMIQ

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“…This process is called chelate-modified Fenton (MF; Fe(II)/Fe(III) + H 2 O 2 + CA) process. Inorganic and organic CAs form complexes with Fe(II)/Fe(III) at neutral pH, keep it soluble, and thus enhance the production of oxidative species and extend the applicability of Fenton oxidation to a wider range of pH [28,40,41]. The extraction of the transition metals of the soil is also enhanced by the addition of chelating agents [42].…”

Section: Major Limitations Of Fenton Oxidation In Contaminated Soilsmentioning

confidence: 99%

“…Applying different CAs to make iron soluble at circumneutral pH (as catalyst for hydrogen peroxide decomposition) has been recently reviewed for Fenton and photo-Fenton processes in the aqueous phase [32,40,41]. The authors affirmed that the contaminants are efficiently degraded by this process (MF), highlighting a potential treatment approach for the degradation of different pollutants (including emerging contaminants, aromatic compounds, pesticides, dyes, etc.)…”

Section: Fe(ii)-mentioning

confidence: 99%

Application of Chelating Agents to Enhance Fenton Process in Soil Remediation: A Review

et al. 2021

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Persistent organic contaminants affecting soil and groundwater pose a significant threat to ecosystems and human health. Fenton oxidation is an efficient treatment for removing these pollutants in the aqueous phase at acidic pH. However, the in-situ application of this technology for soil remediation (where pHs around neutrality are required) presents important limitations, such as catalyst (iron) availability and oxidant (H2O2) stability. The addition of chelating agents (CAs), forming complexes with Fe and enabling Fenton reactions under these conditions, so-called chelate-modified Fenton process (MF), tries to overcome the challenges identified in conventional Fenton. Despite the growing interest in this technology, there is not yet a critical review compiling the information needed for its real application. The advantages and drawbacks of MF must be clarified, and the recent achievements should be shared with the scientific community. This review provides a general overview of the application of CAs to enhance the Fenton process for the remediation of soils polluted with the most common organic contaminants, especially for a deep understanding of the activation mechanisms and influential factors. The existing shortcomings and research needs have been highlighted. Finally, future research perspectives on the use of CAs in MF and recommendations have been provided.

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A review on the use of chelating agents as an alternative to promote photo-Fenton at neutral pH: Current trends, knowledge gap and future studies

Cited by 140 publications

References 127 publications

Copper‐Based Hybrid Polyion Complexes for Fenton‐Like Reactions

Copper‐Based Hybrid Polyion Complexes for Fenton‐Like Reactions

Fenton-adsorption process for leachates from two landfills (karstic-clays)

Application of Chelating Agents to Enhance Fenton Process in Soil Remediation: A Review

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