Electrochemical oxidation of hydroquinone using Eu-doped PbO2 electrodes: Electrode characterization, influencing factors and degradation pathways

Zhang, Zhengting; Yi, Guiyun; Peng, Li; Wang, Xikui; Wang, Xiaodong; Zhang, Chuanxiang; Sun, Qi

doi:10.1016/j.jelechem.2021.115493

Cited by 37 publications

(12 citation statements)

References 54 publications

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“…(c) Time-course results of hydroquinone oxidation at 1.0 V with and without 1 g L –1 FeTC. (d) Comparison of energy consumption with other technologies treating hydroquinone. − EEO: Energy consumption per order of removal. The electrolyte is 0.1 M NaClO 4 solution containing 1 mM oxalate or hydroquinone and experiments were conducted in the divided reactor.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure c, the addition of FeTC can completely degrade hydroquinone in 40 min, while only 61.8% of hydroquinone was removed in the control, indicating that the high valent iron generated from FeTC can significantly enhance the oxidation of hydroquinone. In addition, the energy consumption of using FeTC to treat hydroquinone was compared with other electrochemical technologies (Figure d), − showing a low energy consumption of 0.06 kWh m –3 (Table S2).…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Direct Electron Transfer Mediated Contaminant Degradation by Fe(IV) Using a Carbon Black-Supported Fe(III)-TAML Suspension Electrode System

Xie

Miller

et al. 2023

Environ. Sci. Technol.

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Iron complexes of tetra-amido macrocyclic ligands (Fe-TAML) are recognized to be effective catalysts for the degradation of a wide range of organic contaminants in homogeneous conditions with the high valent Fe(IV) and Fe(V) species generated on activation of the Fe-TAML complex by hydrogen peroxide (H2O2) recognized to be powerful oxidants. Electrochemical activation of Fe-TAML would appear an attractive alternative to H2O2 activation, especially if the Fe-TAML complex could be attached to the anode, as this would enable formation of high valent iron species at the anode and, importantly, retention of the valuable Fe-TAML complex within the reaction system. In this work, we affix Fe-TAML to the surface of carbon black particles and apply this “suspension anode” process to oxidize selected target compounds via generation of high valent iron species. We show that the overpotential for Fe(IV) formation is 0.17 V lower than the potential required to generate Fe(IV) electrochemically in homogeneous solution and also show that the stability of the Fe(IV) species is enhanced considerably compared to the homogeneous Fe-TAML case. Application of the carbon black-supported Fe-TAML suspension anode reactor to degradation of oxalate and hydroquinone with an initial pH value of 3 resulted in oxidation rate constants that were up to three times higher than could be achieved by anodic oxidation in the absence of Fe-TAML and at energy consumptions per order of removal substantially lower than could be achieved by alternate technologies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced Direct Electron Transfer Mediated Contaminant Degradation by Fe(IV) Using a Carbon Black-Supported Fe(III)-TAML Suspension Electrode System

Xie

Miller

et al. 2023

Environ. Sci. Technol.

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“…This result is probably because the unstable phenoxy radical formed between phenol and OH • led to the urea bond scission of MBU-EA more efficiently. Hence, hydroquinone was used to inhibit OH • at the bubble–liquid interface, which forms stable benzoquinone after reaction with OH • (with the rate constant being 11 × 10 9 M –1 s –1 ) and is more hydrophobic than phenol. , Both the release rate and yield of MB decreased with the enhanced hydroquinone concentration, indicating that this transformation occurred at the bubble–liquid interface (Figure E). To further support this claim, tert -butanol was tested as another radical scavenger.…”

Section: Resultsmentioning

confidence: 99%

Urea-Bond Scission Induced by Therapeutic Ultrasound for Biofunctional Molecule Release

Tong

Huang

et al. 2022

J. Am. Chem. Soc.

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Ultrasound-triggered remote control of biomolecular functions in cells provides unique advantages for us to interrogate nature. However, strategies to design therapeutic ultrasound-responsive functional molecules remain elusive, and rare ultrasound-cleavable chemical bonds have been developed to date. Herein, therapeutic ultrasound (1 MHz)-induced scission of urea bonds for drug release is demonstrated for the first time. Such a transformation has been verified to be initiated by hydroxyl radicals generated in the interior of cavitation bubbles, occurring specifically at the cavitation bubble−liquid interface. A series of urea-bond-containing prodrugs based on methylene blue (MB), namely MBUs, are designed. Upon sonication with low-intensity therapeutic ultrasound, the urea bonds linked with primary amines can be selectively cleaved, and free MB is released in a physiologically relevant environment, accompanied by recovered absorbance, fluorescence, and photosensitivity. Moreover, an FDAapproved alkylating agent (i.e., melphalan) bearing urea bond is also developed (MBU-Mel), successfully achieving ultrasoundtriggered drug release in deep-seated cancer cells (mimic with 1 cm pigskin), showing the scalability of our ultrasound-responsive molecule platform in bioactive molecules release. This may set the starting point for therapeutic ultrasound-induced drug release, making a forward step in "sonopharmacology".

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“…Because of their outstanding catalysis performance, they have been widely used in heterogeneous catalysis waste gas treatment, petrochemical engineering, etc. [26][27][28] Eu is a classic lanthanide element with stable electron saturation structure and high conductivity of 1.2 × 10 4 Ω À 1 cm À 1 . [26] Thus, the electrochemical properties of SnO 2 may be improved through Eu doping.…”

Section: Introductionmentioning

confidence: 99%

Enzymatic Electrochemical Biosensor from Eu‐Doped SnO₂ Embedded in MXene for High Performance Sensing Lactate

et al. 2022

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In this work, Eu3+‐doped SnO2 nanoparticles are prepared and embedded into MXene (Ti3C2) laminates, and Ti3C2@Eu‐SnO2 composites are obtained. Cyclic voltammetry (CV) and scanning electron microscopy (SEM) characterization show that the composites have excellent electrochemical properties and unique morphology. The electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectrometer (FTIR) results of lactate oxidase (Lox) immobilized on Ti3C2@Eu‐SnO2 indicate that Eu‐SnO2, Ti3C2, and Lox have a good hybrid coordination and biocompatibility. The enzymatic electrochemical biosensor constructed with Ti3C2@Eu‐SnO2/Lox on glassy carbon electrode (GCE) reveals an excellent linear relationship in the lactate concentration ranging from 1.0×10−9 to 1.0×10−4 mol L−1. It has a low detection limit of 3.38×10−10 mol L−1 and high sensitivity of 4.815 mA nmol−1 L cm−2. Furthermore, the fabricated biosensor has a reasonable recovery rate for determining lactate in human serum.

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Electrochemical oxidation of hydroquinone using Eu-doped PbO2 electrodes: Electrode characterization, influencing factors and degradation pathways

Cited by 37 publications

References 54 publications

Enhanced Direct Electron Transfer Mediated Contaminant Degradation by Fe(IV) Using a Carbon Black-Supported Fe(III)-TAML Suspension Electrode System

Enhanced Direct Electron Transfer Mediated Contaminant Degradation by Fe(IV) Using a Carbon Black-Supported Fe(III)-TAML Suspension Electrode System

Urea-Bond Scission Induced by Therapeutic Ultrasound for Biofunctional Molecule Release

Enzymatic Electrochemical Biosensor from Eu‐Doped SnO₂ Embedded in MXene for High Performance Sensing Lactate

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Electrochemical oxidation of hydroquinone using Eu-doped PbO2 electrodes: Electrode characterization, influencing factors and degradation pathways

Cited by 37 publications

References 54 publications

Enhanced Direct Electron Transfer Mediated Contaminant Degradation by Fe(IV) Using a Carbon Black-Supported Fe(III)-TAML Suspension Electrode System

Enhanced Direct Electron Transfer Mediated Contaminant Degradation by Fe(IV) Using a Carbon Black-Supported Fe(III)-TAML Suspension Electrode System

Urea-Bond Scission Induced by Therapeutic Ultrasound for Biofunctional Molecule Release

Enzymatic Electrochemical Biosensor from Eu‐Doped SnO2 Embedded in MXene for High Performance Sensing Lactate

Contact Info

Product

Resources

About

Enzymatic Electrochemical Biosensor from Eu‐Doped SnO₂ Embedded in MXene for High Performance Sensing Lactate