Insights into the mechanism of multiple Cu-doped CoFe2O4 nanocatalyst activated peroxymonosulfate for efficient degradation of Rhodamine B

Mo, Yuanmin; Zhang, Xiaoping

doi:10.1016/j.jes.2022.12.003

Cited by 19 publications

(1 citation statement)

References 65 publications

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“…In recent years, the use of peroxymonosulfate (PMS) as a chemical oxidant in AOPs has gained significant attention (Huang et al, 2021; Mo & Zhang, 2024; Peng et al, 2023; Wang et al, 2023). The activation of peroxymonosulfate will produce sulfate radicals (SO 4 •− ), hydroxyl radicals (OH • ), and other active species (Chen et al, 2020; Wang et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn₂O₄

Ruan,

Wang,

Huang

et al. 2024

Water Environment Research

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In this study, a highly efficient peroxymonosulfate (PMS) activator, ZnO/ZnMn2O4, was synthesized using a simple one‐step hydrothermal method. The resulting bimetallic oxide catalyst demonstrated a homogenous and high‐purity composition, showcasing synergistic catalytic activity in activating PMS for degrading 2, 4‐dichlorophenol (2, 4‐DCP) in aqueous solution. This catalytic performance surpassed that of individual ZnO, Mn2O3, and ZnMn2O4 metal materials. Under the optimized conditions, the removal efficiency of 2, 4‐DCP reached approximately 86% within 60 min, and the catalytic ability remained almost constant even after four cycles of recycling. The developed degradation system proved effective in degrading other azo‐dye pollutants. Certain inorganic anions such as HPO4−, HCO3−, and NO3− significantly inhibited the degradation of 2, 4‐DCP, while Cl− and SO42− did not exhibit such interference. Results from electrochemical experiments indicated that the electron transfer ability of ZnO/ZnMn2O4 surpassed that of individual metals, and electron transfer occurred between ZnO/ZnMn2O4 and the oxidant. The primary active radicals responsible for degrading 2, 4‐DCP were identified as SO4•−, OH• and O2•−, generated through the oxidation and reduction of PMS catalyzed by Zn (II) and Mn (III). Furthermore, X‐ray photoelectron spectroscopy (XPS) analysis of the fresh and used catalysts revealed that the exceptional electron transfer ability of ZnO facilitated the valence transfer of Mn (III) and the transfer of electrons to the catalyst's oxygen surface, thus enhancing the catalytic efficiency. The analysis of radicals and intermediates indicates that the two main pathways for degrading 2, 4‐DCP involve hydroxylation and radical attack on its aromatic ring.Practitioner Points A bimetallic ZnO/ZnMn2O4 catalyst was synthesized and characterized. ZnO/ZnMn2O4 can synergistically activate PMS to degrade 2, 4‐DCP compared with single metal oxide. Three primary active radicals, O2•−, •OH, and SO4•−, were generated to promote the degradation. ZnO promoted electron transfer among the three species of Mn to facilitate oxidizing pollutants. Hydroxylation and radical attack on the aromatic ring of 2, 4‐DCP are the two degradation pathways.

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Section: Introductionmentioning

confidence: 99%

Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn₂O₄

Ruan,

Wang,

Huang

et al. 2024

Water Environment Research

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One-pot synthesis of bimetallic Fe–Cu metal–organic frameworks composite for the elimination of organic pollutants via peroxymonosulphate activation

Fdez-Sanromán,

Rosales,

Pazos

et al. 2023

Environ Sci Pollut Res

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A series of bimetallic of FeCu metal–organic frameworks (MOFs) have been synthesised using a solvothermal process by varying the ratio between the two metals. Further, the bimetallic MOF catalysts were characterised by X-ray powder diffraction, scanning electron microscopy, and infrared spectroscopy techniques. Their catalytic properties for activation of peroxymonosulphate (PMS) have been tested by the removal of a model dye, rhodamine B. As a result, NH2–Fe2.4Cu1-MOF demonstrated the highest degradation, the effect of the ratio NH2–Fe2.4Cu1-MOF/PMS has been studied, and the main reactive species have been assessed. The application of these MOFs in powder form is difficult to handle in successive batch or flow systems. Thus, this study assessed the feasibility of growing NH2–Fe2,4Cu1-MOF on polyacrylonitrile (PAN) spheres using the one-pot solvothermal synthesis method. The optimisation of the catalytic activity of the synthesised composite (NH2–Fe2.4Cu1-MOF@PAN) has been evaluated by response surface methodology using a central composite face-centred experimental design matrix and selecting as independent variables: time, PMS concentration, and catalyst dosage. Based on the results, the optimisation of the operational conditions has been validated. At 2.5 mM PMS, 90 min, and 1.19 g·L−1 of catalyst dosage, maximum degradation (80.92%) has been achieved, which doubles the removal values obtained in previous studies with other MOFs. In addition, under these conditions, the catalyst has been proven to maintain its activity and stability for several cycles without activity loss. Graphical Abstract

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Enhanced degradation of Direct Red 80 dye via Fenton-like process mediated by cobalt ferrite: generated superoxide radicals and singlet oxygen

do Carmo Dias,

de Souza,

de Souza

et al. 2024

Environ Sci Pollut Res

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Insights into the mechanism of multiple Cu-doped CoFe2O4 nanocatalyst activated peroxymonosulfate for efficient degradation of Rhodamine B

Cited by 19 publications

References 65 publications

Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn₂O₄

Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn₂O₄

One-pot synthesis of bimetallic Fe–Cu metal–organic frameworks composite for the elimination of organic pollutants via peroxymonosulphate activation

Enhanced degradation of Direct Red 80 dye via Fenton-like process mediated by cobalt ferrite: generated superoxide radicals and singlet oxygen

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Insights into the mechanism of multiple Cu-doped CoFe2O4 nanocatalyst activated peroxymonosulfate for efficient degradation of Rhodamine B

Cited by 19 publications

References 65 publications

Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn2O4

Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn2O4

One-pot synthesis of bimetallic Fe–Cu metal–organic frameworks composite for the elimination of organic pollutants via peroxymonosulphate activation

Enhanced degradation of Direct Red 80 dye via Fenton-like process mediated by cobalt ferrite: generated superoxide radicals and singlet oxygen

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Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn₂O₄

Degradation of 2, 4‐dichlorophenol by peroxymonosulfate catalyzed by ZnO/ZnMn₂O₄