Modified carbon felt made using CexA1−xO2 composites as a cathode in electro-Fenton system to degrade ciprofloxacin

Li, Yi; Han, Jingjing; Mi, Xueyue; Mi, Xinqiang; Li, Yanan; Zhang, Suge; Zhan, Sihui

doi:10.1039/c7ra03302h

Cited by 23 publications

(6 citation statements)

References 57 publications

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“…First, 34.40 mg of Ce(NO 3 ) 3 ·6H 2 O, 11.33 mg of Zr(NO 3 ) 4 ·5H 2 O, and 14.27 mg of FeCl 3 ·6H 2 O (molar ratio of 3:1:2) dissolved in 50 mL of beaker with 20 mL of deionized water. Then, the pretreated CF (5 cm × 3 cm × 0.5 cm) was immersed into the aforementioned solution . When the CF was completely soaked, 0.1 mol L –1 NH 3 ·H 2 O was added to the solution until a yellowish-brown precipitate was formed.…”

Section: Methodsmentioning

confidence: 99%

“…Then, the pretreated CF (5 cm × 3 cm × 0.5 cm) was immersed into the aforementioned solution. 16 When the CF was completely soaked, 0.1 mol L −1 NH 3 •H 2 O was added to the solution until a yellowish-brown precipitate was formed. To disperse the precipitation adequately on the surface of CF, the ultrasonic treatment was carried out for 30 min.…”

Section: Introductionmentioning

confidence: 99%

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Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Xie

Liu

et al. 2019

ACS Appl. Mater. Interfaces

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Polyacrylamide (PAM) in environmental water has become a major problem in water pollution management due to its high molecular mass, corrosion resistance, high viscosity, and nonabsorption by soil. The composite of Fe-doped Ce0.75Zr0.25O2 solid solution (Fe-Ce0.75Zr0.25O2) loaded on carbon felt (CF) was fabricated by a hydrothermal synthesis method, which was used as the cathode in a heterogeneous electro-Fenton system for the degradation of PAM. It showed that the degradation efficiency of PAM by the Fe-Ce0.75Zr0.25O2/CF cathode was 86% after 120 min and the molecular mass of PAM decreased by more than 90% after 300 min. Total organic carbon removal reached 78.86% in the presence of Fe-Ce0.75Zr0.25O2/CF, while the value was only 38.01% in the absence of Fe-Ce0.75Zr0.25O2. Further studies showed that the breaking of the chain begins with the amide bond, and then, the carbon chain was cracked into a short alkyl chain. As degradation progressed, both the complex viscosity and elasticity modulus of PAM solutions decreased nearly 50% at 300 min. It indicated that •OH were the most significant active species for the degradation of PAM. This novel Fe-Ce0.75Zr0.25O2/CF composite is an efficient and promising electrode for the removal of PAM in wastewater.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Xie

Liu

et al. 2019

ACS Appl. Mater. Interfaces

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“…This enhanced degradation rate of CIP is due to the higher electrochemical production of H 2 O 2 and facilitated Fe 2+ catalyst regeneration that causes a higher concentration of homogeneous •OH in the solution . However, with the further increase of current, the degradation rate begins to decrease because the four-electron O 2 reduction side reaction has an enhanced rate which competes with the CIP oxidative degradation (eqs – ) . The optimal current for the CIP degradation is 0.3 A by 6 mm plastic pipe aeration.…”

Section: Results and Discussionmentioning

confidence: 99%

“…4 However, with the further increase of current, the degradation rate begins to decrease because the four-electron O 2 reduction side reaction has an enhanced rate which competes with the CIP oxidative degradation (eqs 5−7). 39 The optimal current for the CIP degradation is 0.3 A by 6 mm plastic pipe aeration. On the other hand, as the applied current of membrane aeration increases from 0.1 to 0.3 A, the CIP degradation rate after 60 min of 800 nm membrane aeration and 3 μm membrane aeration increases from 94.24% and 96.06% to 96.29% and 97.52%, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Electro-Fenton Degradation of Ciprofloxacin by Membrane Aeration

Zhi

Han

Zheng

et al. 2022

Ind. Eng. Chem. Res.

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Electro-Fenton is a widely used electrochemical advanced oxidation process for the treatment of refractory organic pollutants, in which O 2 input is required to generate hydrogen peroxide. The aeration mode directly affects the dissolution and stability of O 2 bubbles in the solution, thus the rate of degradation. Herein, membrane aeration was introduced to the electro-Fenton degradation of ciprofloxacin in which O 2 was dispersed into the liquid phase in the form of microbubbles through the ceramic membrane. Microbubbles can greatly improve the gas−liquid mass transfer efficiency of unit volume O 2 to obtain an ultrahigh concentration of dissolved O 2 up to 46 mg/L, thus improving the reaction rate. The effects of aeration mode, applied current, membrane aperture, aeration rate, and ciprofloxacin concentration on degradation rate were studied. Compared with the conventional electro-Fenton process using plastic pipe aeration, the membrane aeration-enhanced electro-Fenton (MAEF) system achieved a significant improvement in the degradation rate, and the reaction time required to achieve a 97% degradation ratio was remarkably reduced from 4 h to 10 min. Membrane aeration is an efficient approach to facilitating heterogeneous catalysis reactions involving the gas phase.

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“…16,27,31,43 A much higher charge transfer resistance was observed for the carbon felt cathode (99.6 Ω) with its low electrical conductivity and porous surface structure presumably affecting electron transfer at its surface. 31,44,45 LSV results show that Ni reduction overpotential (∼−0.38 V) for carbon felt is relatively low while the hydrogen evolution reaction (HER) potential (∼−1.22 V) is high (Figure S4a,b). 46,47 In comparison, the HER potential and Ni reduction overpotential are similar for all other cathodes (Figure S4a,b).…”

Section: Chemical Reagents and Electrode Preparationmentioning

confidence: 99%

Approaches to Enhancing Cathodic Nickel Recovery from Ni-EDTA Containing Synthetic Wastewaters

et al. 2023

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Ethylenediaminetetraacetic acid (EDTA) is widely employed as a chelating agent in the electroless nickel plating industry to form stable metal−organic complexes (e.g., Ni-EDTA). These metal−organic complexes cannot be removed from plating wastewaters by traditional treatments in a cost-effective way. While electrochemical advanced oxidation processes (EAOPs) have been utilized for the efficient degradation of Ni-EDTA at the anode, challenges remain in the simultaneous and effective recovery of nickel at the cathode. In this study, we investigate the efficacy of five cathode materials [i.e., carbon felt (CF), titanium plate, graphite plate (GP), copper plate, and stainless-steel plate] with respect to Ni recovery. The highest Ni removal efficiency of 81.6 ± 0.1% was achieved with the carbon felt cathode which was 30% higher than that of the titanium cathode (52.1 ± 1.4%) with the improvement in performance attributed to the higher rate of mass transport of Ni ions (CF: 4.3 ± 0.4 × 10 −4 s −1 vs Ti: 1.8 ± 0.2 × 10 −4 s −1 ) toward the nanowire structure of carbon felt and to the large surface area of the carbon felt cathode compared with the other cathodes. While the chemical composition of the deposits was independent of the cathodic material or structure, the morphology of deposition varied with the cathode material. The accumulated Ni on the carbon felt surface was successfully recovered either as a nickel salt solution by acid leaching or as high purity NiO by calcinating the Ni-loaded carbon felt cathode at over 800 °C. The performance of the regenerated carbon felt after acid leaching was comparable to that of the fresh cathode even after 10 cycles of use and regeneration via acid leaching with this result confirming the stability and reusability of the carbon felt material.

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Modified carbon felt made using Ce_xA_1−xO₂ composites as a cathode in electro-Fenton system to degrade ciprofloxacin

Abstract: Carbon felt (CF) was modified by CexA1−xO2 (A = Zr, Cu and Ni) and the role of these CexA1−xO2/CF (A = Zr, Cu and Ni) cathode materials in the oxidative degradation of antibiotic ciprofloxacin (CIP) was investigated in the electro-Fenton system.

Cited by 23 publications

References 57 publications

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Enhanced Electro-Fenton Degradation of Ciprofloxacin by Membrane Aeration

Approaches to Enhancing Cathodic Nickel Recovery from Ni-EDTA Containing Synthetic Wastewaters

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Modified carbon felt made using CexA1−xO2 composites as a cathode in electro-Fenton system to degrade ciprofloxacin

Abstract: Carbon felt (CF) was modified by CexA1−xO2 (A = Zr, Cu and Ni) and the role of these CexA1−xO2/CF (A = Zr, Cu and Ni) cathode materials in the oxidative degradation of antibiotic ciprofloxacin (CIP) was investigated in the electro-Fenton system.

Cited by 23 publications

References 57 publications

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce0.75Zr0.25O2 Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce0.75Zr0.25O2 Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Enhanced Electro-Fenton Degradation of Ciprofloxacin by Membrane Aeration

Approaches to Enhancing Cathodic Nickel Recovery from Ni-EDTA Containing Synthetic Wastewaters

Contact Info

Product

Resources

About

Modified carbon felt made using Ce_xA_1−xO₂ composites as a cathode in electro-Fenton system to degrade ciprofloxacin

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process

Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce_0.75Zr_0.25O₂ Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process