Accelerating radical generation from peroxymonosulfate by confined variable Co species toward ciprofloxacin mineralization: ROS quantification and mechanisms elucidation

Liang, Jinping; Fu, Ling; Gao, Kai; Duan, Xiaoguang

doi:10.1016/j.apcatb.2022.121542

Cited by 108 publications

(20 citation statements)

References 84 publications

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“…The PMSO to PMSO 2 conversion ratio was employed to identify Fe(IV). , Figure a shows that 175 μmol·L –1 PMSO was consumed, while only 70 μmol·L –1 PMSO 2 was produced, so the PMSO 2 yield was 40%. In Figure b, higher PMSO concentrations (1000 μmol·L –1 ) caused an increase in PMSO 2 yield (50%), and similar results were found in previous studies . These findings confirm that Fe(IV) was formed during Fe 3+ /PDS/β-Mo 2 C. However, the low yield of PMSO 2 (0 < η < 1) indicated that Fe(IV) was not the only reason causing the PMSO decomposition.…”

Section: Results and Discussionsupporting

confidence: 88%

Efficacious Reduction of Ferric Ions by Molybdenum Carbide in the Peroxydisulfate Fenton-Like Reaction for Dexamethasone Degradation

et al. 2023

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The tardy Fe2+ regeneration and the limited pH range confine the practical application of Fe-based homogenous Fenton-like reaction performance. To surmount the abovementioned obstacles, we applied molybdenum carbide (β-Mo2C) as the cocatalyst to boost Fe3+ reduction in the activation of peroxydisulfate (PDS) for the efficient degradation of dexamethasone (DXM). The proposed Fe3+/PDS/β-Mo2C can remove more than 90% DXM in the wide pH range (3.4 to 9.4). Electron spin resonance analysis and probe and quenching tests comprehensively demonstrated that a series of reactive species (•OH, SO4 •–, O2 •–, 1O2, and Fe(IV)) were formed during the synergistic process, and SO4 •– was the leading role. The circulation of Fe3+/Fe2+ was driven by the exposed sites of Mo2+/Mo4+ on the β-Mo2C, which further promoted the PDS activation. The reaction mechanism was clarified by various characterizations and density functional theory calculation, which indicated that the adsorption between Fe3+ and β-Mo2C could form Mo–Fe bonds and lengthen Fe–O and then improve the electron transport from β-Mo2C to Fe3+ and boost Fe3+ reduction. The reactivity and stability of β-Mo2C was higher than those of popular Mo-based materials. This work represents an attempt and possibility for Mo-based inorganic cocatalysis of advanced oxidation processes.

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Section: Results and Discussionsupporting

confidence: 88%

Efficacious Reduction of Ferric Ions by Molybdenum Carbide in the Peroxydisulfate Fenton-Like Reaction for Dexamethasone Degradation

et al. 2023

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“…LSV can intuitively reveal the transfer process of electrons enriched on the surface of rGO to H 2 O 2 molecules (Figure d) . When FeOCl/CC@rGO was used as the working electrode, there was no apparent response current change in the electrolyte containing only OTC.…”

Section: Resultsmentioning

confidence: 99%

“…LSV can intuitively reveal the transfer process of electrons enriched on the surface of rGO to H 2 O 2 molecules (Figure 6d). 39 When FeOCl/CC@rGO was used as the working electrode, there was no apparent response current change in the electrolyte containing only OTC. Upon the addition of H 2 O 2 , however, the current increased rapidly with a positive shift in the open circuit potential, indicating that H 2 O 2 interacted with the rGO shell to form a charge-transfer (donor−acceptor) complex.…”

Section: Activity and Stabilitymentioning

confidence: 99%

Overcoming the Activity–Stability Trade-Off in Heterogeneous Electro-Fenton Catalysis: Encapsulating Carbon Cloth-Supported Iron Oxychloride within Graphitic Layers

Cui

Zhao

Xie³

et al. 2022

ACS Catal.

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Maintaining a long-term service life of catalytic materials under the established configuration and design concept is a key focus in catalytic process research and development, especially for iron-functionalized cathode-based heterogeneous electro-Fenton (EF) processes operated under harsh conditions. Herein, a versatile and robust encapsulation engineering strategy is proposed based on the concept of tightly covering the surface of conventional iron-functionalized cathodes with an ultrathin carbon layer to significantly improve the stability of composite cathodes without causing activity loss. Taking carbon cloth-supported iron oxychloride (FeOCl/CC) as a model cathode catalyst, it was successfully encapsulated in a reduced graphene oxide protective shell (FeOCl/CC@rGO) using an electrophoretic deposition method, thereby achieving high stability due to negligible iron leaching (only 0.57% of FeOCl/CC), while maintaining almost unaffected activity due to electron penetration effect. Experimental analysis of the structure–activity relationship and theoretical calculations were used to establish the underlying molecular mechanism of electron penetration-triggered H2O2 activation on the outermost surface of rGO. This study uses an effective approach to overcome the activity–stability trade-off of integrated cathodes in heterogeneous EF processes, providing theoretical guidance for the rational design of high-performance cathodes with an encapsulated structure.

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“…As depicted in Figure S22a, with the presence of BQ, only 13% BPA can be degraded within 60 min and k app reduces to 0.004 min –1 . It is notable that although BQ is used as the scavenger for O 2 •– ( k BQ , O2 •‑ = (0.9–1.0) × 10 9 M –1 s –1 ), it has a high reaction rate constant with ·OH ( k BQ , ·OH = 1.2 × 10 9 M –1 s –1 ) . Therefore, O 2 •– makes a minor contribution.…”

Section: Resultsmentioning

confidence: 99%

“…•− (k BQ,O2•-= (0.9−1.0) × 10 9 M −1 s −1 ), it has a high reaction rate constant with •OH (k BQ,•OH = 1.2 × 10 9 M −1 s −1 ). 53 Therefore, O 2…”

Section: •−mentioning

confidence: 98%

Facet Dependent Activity of Fe(III) Species Modified TiO₂ for Simulated Sunlight Driven Fenton-like Reactions

Zhao

Liu

et al. 2022

ACS Appl. Mater. Interfaces

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TiO2 crystals with different exposed facets are synthesized and modified facilely by depositing Fe(III) species. With more (101) facets exposed, the photoactivity of Fe-TiO2 is obviously enhanced with peroxymonosulfate (PMS) as oxidant. The degradation rate for 20 ppm Bisphenol A (BPA) on Fe-TiO2 (101) can achieve 0.219 min–1, ∼8.5 times faster than that of pure TiO2 under simulated sunlight irradiation. Photoelectrochemical measurements and density functional theory (DFT) calculations confirm that the interfacial charge transfer (IFCT) on Fe-TiO2 (101) is stronger than that on Fe-TiO2 (001) and a faster Fe(III)/Fe(II) transformation rate can be therefore achieved. As a result, the generation of ·OH and 1O2 will be accelerated with more (101) facets exposed, thus obtaining better photoactivity. Under the Fe-TiO2/PMS/Light system, BPA can be effectively degraded in a wide pH range or in the presence of multiple inorganic anions. After five cycles, 100% BPA can still be degraded within 60 min. The study provides new photocatalysts design strategy based on Fe(III)/Fe(II) redox for PMS based photocatalytic oxidation.

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Accelerating radical generation from peroxymonosulfate by confined variable Co species toward ciprofloxacin mineralization: ROS quantification and mechanisms elucidation

Cited by 108 publications

References 84 publications

Efficacious Reduction of Ferric Ions by Molybdenum Carbide in the Peroxydisulfate Fenton-Like Reaction for Dexamethasone Degradation

Efficacious Reduction of Ferric Ions by Molybdenum Carbide in the Peroxydisulfate Fenton-Like Reaction for Dexamethasone Degradation

Overcoming the Activity–Stability Trade-Off in Heterogeneous Electro-Fenton Catalysis: Encapsulating Carbon Cloth-Supported Iron Oxychloride within Graphitic Layers

Facet Dependent Activity of Fe(III) Species Modified TiO₂ for Simulated Sunlight Driven Fenton-like Reactions

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Accelerating radical generation from peroxymonosulfate by confined variable Co species toward ciprofloxacin mineralization: ROS quantification and mechanisms elucidation

Cited by 108 publications

References 84 publications

Efficacious Reduction of Ferric Ions by Molybdenum Carbide in the Peroxydisulfate Fenton-Like Reaction for Dexamethasone Degradation

Efficacious Reduction of Ferric Ions by Molybdenum Carbide in the Peroxydisulfate Fenton-Like Reaction for Dexamethasone Degradation

Overcoming the Activity–Stability Trade-Off in Heterogeneous Electro-Fenton Catalysis: Encapsulating Carbon Cloth-Supported Iron Oxychloride within Graphitic Layers

Facet Dependent Activity of Fe(III) Species Modified TiO2 for Simulated Sunlight Driven Fenton-like Reactions

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Facet Dependent Activity of Fe(III) Species Modified TiO₂ for Simulated Sunlight Driven Fenton-like Reactions