The dominant role of the peroxymonosulfate radical for removing contaminants in a Fenton process with metabisulfite

Farinelli, Giulio; Gil, Angela Garcia; Marugan, Javier; Minella, Marco; Fabbri, Debora; Laurenti, Enzo; Tiraferri, Alberto; Vione, Davide

doi:10.1007/s10311-023-01645-8

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…In the iron systems the ⋅ OH is immediately formed in all the systems and it slightly declines after 20 min with the exception of TPA-Fe(III) system where the presence of ⋅ OH is poor from the beginning and it is kept constant or it is slightly increased over the reaction time (20 min). On the other hand, in manganese systems there is no observation of adducts with both DMPO and TEMP (selective for singlet oxygen) 56 , 60 . Therefore, the manganese systems follow a non-radical path.…”

Section: Resultsmentioning

confidence: 98%

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Assessment of new hydrogen peroxide activators in water and comparison of their active species toward contaminants of emerging concern

Farinelli,

Rebilly,

Banse

et al. 2024

Sci Rep

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Advanced oxidation processes are the most efficient tool to thwart the overaccumulation of harmful organic compounds in the environment. In this direction bioinspired metal complexes may be a viable solution for oxidative degradations in water. However, their synthesis is often elaborated and their scalability consequently low. This study presents alternative easy-to-synthesize bioinspired metal complexes to promote degradations in water. The metals employed were iron and manganese ions, hence cheap and highly accessible ions. The complexes were tested toward Phenol, Estrone, Triclosan, Oxybenzone, Diclofenac, Carbamazepine, Erythromycin, Aspartame, Acesulfame K, Anisole and 2,4-Dinitrotoluene. The reaction favoured electron-rich compounds reaching a removal efficiency of over 90%. The central ion plays a crucial role. Specifically, Mn(II) induces a non-radical pathway while iron ions a predominant radical one (⋅OH is predominant). The iron systems resulted more versatile toward contaminants, while the manganese ones showed a higher turn-over number, hence higher catalytic behaviour.

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Section: Resultsmentioning

confidence: 98%

“…Literature reports that dioxygen can deeply affect the reaction efficiency when ⋅ OH is the predominant active species 56 – 58 . With this respect, the experiments of Fig.…”

Section: Resultsmentioning

confidence: 99%

Assessment of new hydrogen peroxide activators in water and comparison of their active species toward contaminants of emerging concern

Farinelli,

Rebilly,

Banse

et al. 2024

Sci Rep

Self Cite

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Harnessing Magnesium Ion for Innovative Fenton-Like Processes: Greener Multi-Oxidants Strategy to Depollute Water

Vijay,

Rolly,

Marks

et al. 2024

Preprint

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Organic water pollution poses significant environmental and public health challenges. Fenton reaction process is used as an advanced oxidation process to depolllute water, typically relying on transition metals and effective under acidic conditions of pH 3.0, contributing to secondary pollution. This research presents a Fenton-like process for the first time without applying transition metals that produce multi-oxidative species and are operational around neutral pH conditions. A solution comprising magnesium ions (Mg²⁺), bicarbonate ions (HCO₃⁻), and hydrogen peroxide (H₂O₂) at pH 7.4 generated reactive oxygen species that effectively degrade organic pollutants (e.g. dimethyl sulfoxide and acetamidophenol) in water. Product analysis was conducted using 1H-NMR and HPLC techniques to determine the efficiency of the oxidation process and to identify transformation products. The findings revealed that the active multi-oxidizing agents, hydroxyl radical and carbonate radical or superoxide and carbonate radical, effectively depolluted water. This study is novel in demonstrating that a Fenton-like process can be achieved with Mg²⁺ serving only as a template to facilitate redox reactions rather than participating directly. These findings suggest a more sustainable approach to remediating water pollutants. The mechanisms for generating oxidizing radicals offer potential applications in both environmental cleanup and biological processes.

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The dominant role of the peroxymonosulfate radical for removing contaminants in a Fenton process with metabisulfite

Cited by 2 publications

References 18 publications

Assessment of new hydrogen peroxide activators in water and comparison of their active species toward contaminants of emerging concern

Assessment of new hydrogen peroxide activators in water and comparison of their active species toward contaminants of emerging concern

Harnessing Magnesium Ion for Innovative Fenton-Like Processes: Greener Multi-Oxidants Strategy to Depollute Water

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