Modified iron-carbon as heterogeneous electro-Fenton catalyst for organic pollutant degradation in near neutral pH condition: Characterization, degradation activity and stability

Zhang, Chao; Zhou, Minghua; Yu, Xinmin; Ma, Liang; Yu, Fangke

doi:10.1016/j.electacta.2015.01.092

Cited by 74 publications

(22 citation statements)

References 40 publications

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“…These electrochemical processes achieved good results; however, they are expensive [ 18 , 19 , 20 , 21 ]. Iron-carbon micro-electrolysis coupled with H 2 O 2 is an advanced oxidation process (AOP), characterized by low processing cost, low energy consumption, long service life, simple operation, and convenient maintenance [ 22 , 23 ]. However, the decolorization effect and degradation mechanism of azo-dye wastewater is yet to be elucidated using this technology.…”

Section: Introductionmentioning

confidence: 99%

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Yang

Gao

Yan

et al. 2018

IJERPH

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Currently, many industrial dyes are discharged into the environment in China, leading to serious water pollution. However, synthetic organic dyes in industrial effluents cannot be degraded by conventional wastewater treatment methods. Consequently, it is necessary to develop new environmentally friendly technologies to completely mineralize these non-biodegradable compounds. In this study, 300 mg/L typical Color Index (CI) Direct Blue 15 (benzidine disazo) in simulated dye wastewater was degraded by iron-carbon micro-electrolysis coupled with H2O2 to explore its decolorization, total organic carbon (TOC) removal rate, and degradation characteristics. Under the optimal degradation conditions (Fe/C = 2:1, pH = 3, 60-min reaction, 2 mL/L H2O2 (added in three aliquots), 300 mg/L dye), the TOC removal rate and the level of dye decolorization attained 40% and 98%, respectively. In addition, the degradation kinetics indicated that the iron-carbon micro-electrolysis process coupled with H2O2 followed first-order reaction kinetics. A degradation pathway for CI Direct Blue 15 was proposed based on the analysis results of treated wastewater obtained using UV-Vis spectrophotometry and gas chromatography–mass spectrometry (GC-MS). This study provides an efficient and economical system for the degradation of non-biodegradable pollutants.

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Section: Introductionmentioning

confidence: 99%

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Yang

Gao

Yan

et al. 2018

IJERPH

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“…On the other hand, to avoid problems related to the loss of dissolved iron and the production of solid sludge, recent investigations focused on the possibility of using heterogeneous catalysts [27][28][29][30][31]. For this purpose, magnetite Fe 3 O 4 has attracted a great attention as efficient catalyst for the heterogeneous Fenton process due to its simple handling, ease of recovery with an external magnetic field, oxidative stability, biological compatibility, strong superparamagnetic behavior and its high catalytic activities [32][33][34].…”

Section: Figurementioning

confidence: 99%

Electro-Fenton catalyzed with magnetic chitosan beads for the removal of Chlordimeform insecticide

Rezgui

Amrane

Fourcade

et al. 2018

Applied Catalysis B: Environmental

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International audienceThe degradation of chlordimeform (CDM) has been investigated by a heterogeneous electro-Fenton process involving magnetite supported chitosan beads (Fe3O4-Cs) as catalyst. The catalyst was prepared by dropwise addition of an acidic chitosan-metal salts solution into sodium hydroxide precipitation bath. SEM, XRD and FTIR analysis were used to characterize the catalysts. The effect of experimental parameters, such as the current intensity, the amount of iron on chitosan beads, the concentration of the catalyst and the initial pH on the pollutant removal rate was investigated. The optimal conditions for the degradation of 37.5 mg L−1 initial CDM concentration were achieved at an applied cathodic current of −5 mA, using 0.5 g L−1 of magnetic chitosan beads (with an average iron amount of 0.104 mmol) and at pH = 3. Under these conditions, CDM was effectively removed within 30 min with 80% of NPOC removal after 6 h of treatment. The reaction followed a pseudo-first order kinetic equation. The adsorption test on the chitosan beads (with and without iron) demonstrated that the insecticide removal was solely induced by heterogeneous electro-Fenton treatment with Fe3O4-CS beads. In addition, the reusability of this catalyst was effectively demonstrated. Finally, LC–MS analysis allowed the proposal of a plausible degradation route. © 2017 Elsevier B.V

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“…Electro-Fenton system is an efficient technology to overcome the first challenge, as it in situ produces H 2 O 2 by electrochemical reduction of O 2 ( Jirkovský et al 2011;Luo et al 2015;Sklari et al 2015;Perazzolo et al 2015;Plakas et al 2016;Zhao et al 2018a). The second challenge can be solved by combining electro-Fenton technology with heterogeneous Fenton-like catalysts, which can catalyze H 2 O 2 to produce •OH in neutral medium (Wang et al 2013;Zhang et al 2015aZhang et al , 2015b. Thus, the electro-Fenton system in neutral medium, which can overcome both of the challenges of the traditional Fenton system, has attracted much more attention (Li et al 2009;Sun et al 2015;Jiang et al 2016;Zhao et al 2016).…”

Section: Introductionmentioning

confidence: 99%

N-doped three-dimensional carbon foam as binder-free electrode for organic pollutants removal by electro-Fenton in neutral medium

et al. 2019

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Electro-Fenton in neutral medium has attracted more and more attention since it can relieve the costs of H2O2 storage and pH adjustment, which are the major disadvantages limiting the practical applications of Fenton reaction. The electrode with good performance for electrochemical H2O2 production from O2 in neutral medium is of great importance in electro-Fenton. Herein, the N-doped three-dimensional carbon foam (NCF) electrode was obtained by using melamine foam as precursor. The nitrogen functional groups and graphitization degree could be tailored by adjusting the carbonization temperature. NCF1000, the sample carbonized at 1,000 °C, presents the H2O2 selectivity of 81.9%, which is the highest among those of other NCFs. The H2O2 concentration in neutral medium on NCF1000 achieved 0.87 mmol L−1 at −0.6 V, which is 1.8, 2 and 2.6 times as much as those on graphite, carbon cloth and carbon felt. Using as cathode in electro-Fenton, NCF1000 exhibits the kinetic rate of 0.062 min−1 for phenol degradation, which is 4.1 times larger than that on graphite electrode. As well, the performance of NCF1000 shows no visible attenuation after ten times phenol removal experiments, demonstrating its good reusability. These results indicate the potential of NCF as a promising alternative for commercial carbon-based electrode in electro-Fenton.

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Modified iron-carbon as heterogeneous electro-Fenton catalyst for organic pollutant degradation in near neutral pH condition: Characterization, degradation activity and stability

Cited by 74 publications

References 40 publications

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Degradation Characteristics of Color Index Direct Blue 15 Dye Using Iron-Carbon Micro-Electrolysis Coupled with H2O2

Electro-Fenton catalyzed with magnetic chitosan beads for the removal of Chlordimeform insecticide

N-doped three-dimensional carbon foam as binder-free electrode for organic pollutants removal by electro-Fenton in neutral medium

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