Microwave photo-oxidation with diverse oxidants for Congo red degradation: effect of oxidants, degradation pathway and economic analysis

Neha, Shukla; Remya, Neelancherry

doi:10.1080/09593330.2019.1670737

Cited by 13 publications

(1 citation statement)

References 21 publications

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“…With the rapid development of printing and dyeing textile industries, the large amount of printing and dyeing wastewater produced has become one of the main water pollution sources in the world (Gu et al, 2021;Pinedo-Hernández et al, 2022). Printing and dyeing wastewater has a complicated composition, high concentration of pollutants, poor biochemical properties, and is difficult to treat (Ben Hafaiedh et al, 2020;Domingues et al, 2019;Shukla and Remya, 2021). Among the contaminants, methyl orange (MO) contains -N=N-and is a typical azo dye (Aghdasinia et al, 2016;.…”

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confidence: 99%

Degradation of methyl orange by the Fenton-like reaction of pyrite-activated hydrogen peroxide forming the Fe(III)/Fe(II) cycle

Wenlong Bi,

Ruojin Du,

Hui Liu

et al. 2024

WSA

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In this study, the typical azo dye methyl orange (MO) was degraded by pyrite (FeS2) activated by hydrogen peroxide (H2O2). When [MO] = 0.1 mM, [FeS2] = 2.0 g/L and [H2O2] = 22 mM, 96.4% MO was removed in 120 min and the TOC removal rate was higher than 50%. HO• was the primary radical responsible for MO degradation. In addition, the acid condition promoted the degradation of MO in the FeS2/H2O2 system. MO in tap water and river water was not effectively degraded, whereas acidification could weaken the inhibitory effect on the FeS2/H2O2 system to enable the degradation of MO in tap and river water. The OD600 indicated that the solution was environmentally friendly after the reaction, and three degradation pathways of MO were discussed. In summary, Fe(II) could be dissolved from FeS2, which activated H2O2 to generate Fe(III) and HO•. FeS2 could reduce Fe(III) into Fe(II), thus realizing the Fe(III)/(II) cycle and efficiently activating H2O2 to degrade MO.

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Section: Introductionmentioning

confidence: 99%

Degradation of methyl orange by the Fenton-like reaction of pyrite-activated hydrogen peroxide forming the Fe(III)/Fe(II) cycle

Wenlong Bi,

Ruojin Du,

Hui Liu

et al. 2024

WSA

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Highly dispersed Mn₂O₃−Co₃O₄ nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Hazarika

Talukdar

Sudarsanam

et al. 2020

Applied Organom Chemis

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This work reports the synthesis of various carbon (Vulcan XC‐72 R) supported metal oxide nanostructures, such as Mn2O3, Co3O4 and Mn2O3−Co3O4 as heterogeneous Fenton‐like catalysts for the degradation of organic dye pollutants, namely Rhodamine B (RB) and Congo Red (CR) in wastewater. The activity results showed that the bimetallic Mn2O3−Co3O4/C catalyst exhibits much higher activity than the monometallic Mn2O3/C and Co3O4/C catalysts for the degradation of both RB and CR pollutants, due to the synergistic properties induced by the Mn−Co and/or Mn (Co)−support interactions. The degradation efficiency of RB and CR was considerably increased with an increase of reaction temperature from 25 to 45°C. Importantly, the bimetallic Mn2O3−Co3O4/C catalyst could maintain its catalytic activity up to five successive cycles, revealing its catalytic durability for wastewater purification. The structure–activity correlations demonstrated a probable mechanism for the degradation of organic dye pollutants in wastewater, involving •OH radical as well as Mn2+/Mn3+ or Co2+/Co3+ redox couple of the Mn2O3−Co3O4/C catalyst.

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Microwave-assisted synthesis and environmental remediation: a review

2023

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Microwave photo-oxidation with diverse oxidants for Congo red degradation: effect of oxidants, degradation pathway and economic analysis

Cited by 13 publications

References 21 publications

Degradation of methyl orange by the Fenton-like reaction of pyrite-activated hydrogen peroxide forming the Fe(III)/Fe(II) cycle

Degradation of methyl orange by the Fenton-like reaction of pyrite-activated hydrogen peroxide forming the Fe(III)/Fe(II) cycle

Highly dispersed Mn₂O₃−Co₃O₄ nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Microwave-assisted synthesis and environmental remediation: a review

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Microwave photo-oxidation with diverse oxidants for Congo red degradation: effect of oxidants, degradation pathway and economic analysis

Cited by 13 publications

References 21 publications

Degradation of methyl orange by the Fenton-like reaction of pyrite-activated hydrogen peroxide forming the Fe(III)/Fe(II) cycle

Degradation of methyl orange by the Fenton-like reaction of pyrite-activated hydrogen peroxide forming the Fe(III)/Fe(II) cycle

Highly dispersed Mn2O3−Co3O4 nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst

Microwave-assisted synthesis and environmental remediation: a review

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Highly dispersed Mn₂O₃−Co₃O₄ nanostructures on carbon matrix as heterogeneous Fenton‐like catalyst