Mechanistic understanding of polychlorinated biphenyls degradation by peroxymonosulfate activated with CuFe2O4 nanoparticles: Key role of superoxide radicals

Qin, Wenxiu; Fang, Guodong; Wang, Yujun; Zhou, Dongmei

doi:10.1016/j.cej.2018.04.215

Cited by 341 publications

(64 citation statements)

References 53 publications

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“…Although conventional oxidation processes can dechlorinate PCBs [32,33], the use of Fe(II) activated H 2 O 2 system resulted in negligible degradation in our experimental conditions ( Fig. 2 and S6), suggesting that the attack of ferrate(VI) on Cl substituents is more efficient than the action of the other oxidants.…”

Section: Integrated Application Of Fe(vi) and Conventional Oxidantsmentioning

confidence: 80%

“…However in case of PCBs, such mechanism is not favored probably due to the high degree of chlorination of molecules hindering the access to the carbon aromatic structure[1], thus necessitating a dechlorination step[33] which is hardly achieved using radical pathway. Qin et al also demonstrated that light PCB (PCB28) needs to be dechlorinated before being mineralized[32], supporting the above suggested mechanistic pathway. This difficulty in oxidizing PCBs by radicals is supported by the…”

mentioning

confidence: 77%

“…and radical pathway, respectively. Since the identification and quantification of PCB degradation by-products in the soil system is not straightforward, this task could be preliminarily performed in aqueous phase, as recently reported in [32,33], with the aim to better understand the degradation pathways in a more complex system (i.e. soil).…”

Section: Availability Of Pcbsmentioning

confidence: 99%

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Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Monfort

Usman

Soutrel

et al. 2019

Chemical Engineering Journal

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Ferrate (Fe(VI)) has emerged as an efficient oxidant to treat organic pollutants in aqueous solution. However, its application has never been assessed to remediate the contaminated soils. Here, we report the first study to use Fe(VI) for chemical oxidation of PCBs in historically contaminated soils obtained from an industrial wasteland. The first part of this study explores the efficiency of ferrate(VI) to degrade PCBs under various experimental conditions (liquid/solid ratio, oxidant dose, temperature and reaction time). Integrated application of Fe(VI) with conventional oxidants (hydrogen peroxide H 2 O 2 , persulfate S 2 O 8 2and peroxymonosulfate HSO 5-) was also tested. Conventional oxidants resulted in only 2-2 12% PCB degradation while Fe(VI) removed 30% of PCBs. Integrated use of Fe(VI) and conventional oxidants improved the degradation efficiency which was the highest (40% removal) by Fe(VI)/HSO 5-. This could be attributed to two-step degradation proceeding firstly by electron transfer with Fe(VI) followed by radical attack of conventional oxidants. To evaluate if PCB degradation is limited by soil factors, role of carbonate content, overall soil matrix, and PCB availability were assessed as a second part of this study. Negative role of soil matrix was highly prominent for conventional oxidants than Fe(VI). An increase in PCB availability improved the treatment efficiency (45% removal by Fe(VI) alone) highlighting the role of soil factors. All these results indicate the higher suitability and efficiency of Fe(VI) as compared to the conventional oxidants for soil remediation. Since use of Fe(VI) is innovative for both soil remediation and PCB oxidation, degradation mechanisms are also proposed.

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Section: Integrated Application Of Fe(vi) and Conventional Oxidantsmentioning

confidence: 80%

mentioning

confidence: 77%

Section: Availability Of Pcbsmentioning

confidence: 99%

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Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Monfort

Usman

Soutrel

et al. 2019

Chemical Engineering Journal

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“…38,39]. The observed strong XRD peaks indicate that the CuFe 2 O 4 @RSDBC was successfully synthesized.…”

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confidence: 88%

Catalytic degradation of Acid Orange 7 in water by persulfate activated with CuFe₂O₄@RSDBC

Guan

Zhou

Zhang

et al. 2020

Mater. Res. Express

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In this study, a novel series of rectorite/sludge derived biochar (RSDBC) supporting CuFe 2 O 4 (CuFe 2 O 4 @RSDBC) composites were prepared as an effective catalyst to active persulfate (PS) for the removal of Acid Orange 7 (AO7) in water. The character of catalyst was analyzed by scanning electron microscope (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR) and x-ray diffraction (XRD). Various influencing factors including initial pH, PS concentration, catalyst dosage, initial dye concentration and reaction temperature were investigated. The optimal reaction conditions were found to be: PS concentration 2 mM; catalyst dosage 0.6 g l −1 ; initial pH value 7.0 and 25°C of reaction temperature. Further radical quenching tests were performed by using ethanol, tert-butanol (TBA) and benzoquinone (BQ), which confirmed that sulfate radicals ( -SO 4 · ) and hydroxyl radicals (HO•−) were the reactive species in the degradation process. The Gas chromatography-mass spectrometry (GC-MS) analysis was employed to determine the intermediate products and a plausible degradation pathway is proposed. In addition, the CuFe 2 O 4 @RSDBC sample exhibited high color removal ability (95%) and stable performance after three successive runs. At last, the catalyst proved a good removal effect for actual dye wastewater. These results indicate that CuFe 2 O 4 @RSDBC hybrids could be as effective catalysts for PS activation on dye pollutants elimination. List of abbreviationsAcronyms RSDBC rectorite/sludge derived biochar AO7 acid orange 7 AOP advanced oxidation process SEM scanning electron microscope TEM transmission electron microscope FTIR fourier transform infrared spectroscopy GC-MS gas chromatography-mass spectrometer PS persulfate XRD x-ray diffraction GAC granular activated carbon REC rectorite SS sewage sludge BET Brunauer-Emmett-Teller

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“…Recently, superoxide anion radicals (O 2 Á-) and singlet oxygen ( 1 O 2 ) have attracted increasing attention due to their unique advantages [46]. Therefore, we also studied the removal efficiency of RhB in the reaction system by adding different concentrations of superoxide dismutase (SOD) and L-histidine (LH), unique scavengers for O 2 Áand 1 O 2 , respectively [46,47]. As shown in Fig.…”

Section: Detection Of Reactive Oxygen Speciesmentioning

confidence: 99%

A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

et al. 2020

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There is an urgent need for an eco-friendly and efficient route to treat the organic pollutants in wastewater. Therefore, we report a facile synthesis of carbon nanotube-magnesium oxide composite (CNTs/MgO) which can efficiently activate peroxymonosulfate (PMS) to degrade Rhodamine B (RhB). Fabricated CNTs/MgO was characterized by XRD, FTIR, SEM, TEM, BET, XPS, and Raman. The results showed that the carbon nanotubes uniformly entangled on the MgO whiskers and linked to the MgO by Mg-C and CO bonds. The effects of temperature, pH value, CNTs/MgO dosage, PMS dosage and the ratio of MgO/CNTs on degradation of RhB were conducted to determine the activation performance of CNTs/MgO. The catalytic degradation process was carried out in a wide pH range of 3-9, and 100% of RhB was degraded in 20 min under optimized conditions. Moreover, the efficient degradation performance was attributed to singlet oxygen generated in the PMS&CNTs/MgO system. The excellent activation properties of CNTs/MgO was derived from the enhanced electron transport performance and chemical bonding between MgO and CNTs. In addition, this work provides an innovative design for the development of novel PMS catalysts without transition metal components.

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Mechanistic understanding of polychlorinated biphenyls degradation by peroxymonosulfate activated with CuFe2O4 nanoparticles: Key role of superoxide radicals

Cited by 341 publications

References 53 publications

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Catalytic degradation of Acid Orange 7 in water by persulfate activated with CuFe₂O₄@RSDBC

A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

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Mechanistic understanding of polychlorinated biphenyls degradation by peroxymonosulfate activated with CuFe2O4 nanoparticles: Key role of superoxide radicals

Cited by 341 publications

References 53 publications

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Ferrate(VI) based chemical oxidation for the remediation of aged PCB contaminated soil: Comparison with conventional oxidants and study of limiting factors

Catalytic degradation of Acid Orange 7 in water by persulfate activated with CuFe2O4@RSDBC

A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

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Product

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Catalytic degradation of Acid Orange 7 in water by persulfate activated with CuFe₂O₄@RSDBC