Fabrication of sandwich-like super-hydrophobic cathode for the electro-Fenton degradation of cefepime: H2O2 electro-generation, degradation performance, pathway and biodegradability improvement

Chu, Yanyang; Su, Hongzhao; Liu, Chang; Zheng, Xianglei

doi:10.1016/j.chemosphere.2021.131669

Cited by 16 publications

(3 citation statements)

References 40 publications

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“…As a result, the effective range of the oxidation process by • OH is limited to only 50 nm in the classical Fenton reaction and about 1 μm from the electrode surface in the electrochemical oxidation system. , Many efforts have been devoted to solving these issues and improving the efficiency of pollutant degradation. For instance, a gas diffusion electrode (GDE) will facilitate O 2 transfer and H 2 O 2 generation; − a sandwich-structured electrode will improve reactants transfer between the layers; materials or electrodes of high adsorption capacity will enhance pollutant adsorption for improved utilization efficiency of hydroxyl radicals ( • OH) due to shorter mass transfer distance. , …”

Section: Introductionmentioning

confidence: 99%

Electro-Fenton-Based Membrane System for Organic Micropollutant Removal: New Trend and Prospect

et al. 2023

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Electro-Fenton-based membrane (EFM) technologies are promising for removing micropollutants in wastewater bearing several benefits such as minimized chemical input, accelerated reactive oxygen species (ROS) generation, and improved ROS utilization efficiency, thanks to the enhanced mass transfer and effectively enlarged electroactive area. However, the complex mechanism and synergies between electro-Fenton reactions and membrane confinement remain unclear; gaining such information would be much beneficial for rational catalyst/membrane design, system optimization, and further application in actual water conditions. In this Perspective, we systematically describe the membrane compositions, multiple reaction pathways, and advances in EFM systems. Then, we proposed some promising hybrid systems that exhibit great synergies in maximizing purification efficiency. Finally, this perspective provides a roadmap for the future development of EFM systems with low cost and high efficiency by outlining the advanced membrane material design, coupling processes, and integrated device design.

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Section: Introductionmentioning

confidence: 99%

Electro-Fenton-Based Membrane System for Organic Micropollutant Removal: New Trend and Prospect

et al. 2023

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“…The hydroxyl radical (•OH) produced from the electro-Fenton (EF) process by the reaction of Fe 2+ and H 2 O 2 solution owns the characteristics of strong oxidation, high reactivity, easy formation, non-selectivity, and harmlessness, which has been proved to have perfect removal performance for the stable complex in wastewater (Wang and Wang, 2018;Chen and Wang, 2021). Chu et al (2022) prepared several composite cathodes using graphite, carbon nanotube, and polytetrafluoroethylene, and the degradation efficiency of cefepime reached nearly 100% at pH 3.0. Zhang et al (2022) synthesized a novel core-shell Fe@Fe 2 O 3 -CeO 2 composite for effective degradation of the tetracycline (TC) pollutant, and TC removal efficiency reached 90.7% within 1 h at the optimum pH of 3.85.…”

Section: Introductionmentioning

confidence: 99%

Decomplexation Performance of Cu–EDTA and Parameter Optimization by Three-Dimensional Electro-Fenton

Huang

Han³

et al. 2022

Front. Environ. Sci.

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The strong stability of Cu–ethylenediaminetetraacetic acid (Cu–EDTA) results in the low decomplexation efficiency by the traditional Fenton process. For breaking this limitation, a three-dimensional electro-Fenton (3D-EF) system was constructed to study the decomplexation of Cu–EDTA at different pH, and the effects of Fe2+ concentration, particle electrode dosage, current density, and coexisting ions on decomplexation performance were investigated. The results showed that 3D-EF exhibited high pollutant removal efficiency in a wide pH range compared with the traditional electro-Fenton process. The optimal conditions for the removal of Cu–EDTA were as follows: the pH was 7, Fe2+ was 1 mmol L−1, granular activated carbon was 2 g L−1, and current density was 10 mA cm−2, and the optimum Cu–EDTA removal efficiency reached 90.95%. In addition, the presence of Cl− slightly improved the decomplexation efficiency, whereas NO3− and HPO42− inhibited the removal of Cu–EDTA. The kinetics of Cu–EDTA decomplexation in all experimental groups followed the first-order kinetic equation.

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“…The hydrophobicity of the cathode ©s also so important in the EF reaction. Chu et al [153] managed to completely degrade cefepime with a sandwich-like superhydrophobic carbon cathode composed of graphite, carbon nanotubes, and PTFE observing that the hydrophobicity of the electrode significantly affects the ORR to H 2 O 2 (Figure 6). Moreover, the prepared superhydrophobic carbon cathode resulted in an excellent reduction of O 2 to H 2 O 2 , and, consequently, an excellent cefepime degradation, which is mainly dependent on the •OH production via Fenton reactions.…”

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confidence: 99%

From Fenton and ORR 2e−-Type Catalysts to Bifunctional Electrodes for Environmental Remediation Using the Electro-Fenton Process

et al. 2023

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Currently, the presence of emerging contaminants in water sources has raised concerns worldwide due to low rates of mineralization, and in some cases, zero levels of degradation through conventional treatment methods. For these reasons, researchers in the field are focused on the use of advanced oxidation processes (AOPs) as a powerful tool for the degradation of persistent pollutants. These AOPs are based mainly on the in-situ production of hydroxyl radicals (OH•) generated from an oxidizing agent (H2O2 or O2) in the presence of a catalyst. Among the most studied AOPs, the Fenton reaction stands out due to its operational simplicity and good levels of degradation for a wide range of emerging contaminants. However, it has some limitations such as the storage and handling of H2O2. Therefore, the use of the electro-Fenton (EF) process has been proposed in which H2O2 is generated in situ by the action of the oxygen reduction reaction (ORR). However, it is important to mention that the ORR is given by two routes, by two or four electrons, which results in the products of H2O2 and H2O, respectively. For this reason, current efforts seek to increase the selectivity of ORR catalysts toward the 2e− route and thus improve the performance of the EF process. This work reviews catalysts for the Fenton reaction, ORR 2e− catalysts, and presents a short review of some proposed catalysts with bifunctional activity for ORR 2e− and Fenton processes. Finally, the most important factors for electro-Fenton dual catalysts to obtain high catalytic activity in both Fenton and ORR 2e− processes are summarized.

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Fabrication of sandwich-like super-hydrophobic cathode for the electro-Fenton degradation of cefepime: H2O2 electro-generation, degradation performance, pathway and biodegradability improvement

Cited by 16 publications

References 40 publications

Electro-Fenton-Based Membrane System for Organic Micropollutant Removal: New Trend and Prospect

Electro-Fenton-Based Membrane System for Organic Micropollutant Removal: New Trend and Prospect

Decomplexation Performance of Cu–EDTA and Parameter Optimization by Three-Dimensional Electro-Fenton

From Fenton and ORR 2e−-Type Catalysts to Bifunctional Electrodes for Environmental Remediation Using the Electro-Fenton Process

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