A comparative study of iron-containing anodes and their influence on electrochemical synthesis of ferrate(VI)

Nikolić-Bujanović, Ljiljana; Čekerevac, Milan I.; Vojinovic-Miloradov, Mirjana; Jokić, Anja; Simičić, Miloš V.

doi:10.1016/j.jiec.2012.05.007

Cited by 16 publications

(11 citation statements)

References 29 publications

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“…The CV curves reveal typical oxidation and reduction peaks like the previous study, 27,37 but the potential and the height of these peaks depend on the materials, potential scan rates, and temperature. When the rate of the potential scan increases, most of the peak height will increase, especially two pairs of redox peaks (O1, R1) and (O3, R3), but the redox peaks O4 and R4 are less dependent on scan rates (Figs.…”

Section: Fe Oh 2esupporting

confidence: 64%

“…XRD patterns of DI and GCI anodes appeared more peak at 2θ of 26.6°deriving from graphite crystalline in the substrate. Thus, the anode surface layer after polarization consisted of the amorphous phase of ferric oxy-hydroxide 27 and the trace of the crystalline phase of the substrate.…”

Section: Fe Oh 2ementioning

confidence: 99%

“…6,7,26 In the electrochemical method, ferrate has been commonly synthesized by anodic dissolution of iron or iron alloy in highly alkaline media. 27,28 The ferrate generation takes place in the transpassive region at the potential close to the oxygen evolution, and the surface of the anode develops an increasing layer of iron oxides/ hydroxides species. This passive layer will affect the efficiency of ferrate(VI) electrochemical generation and depends on many factors including the anode compositions, the type and concentration of electrolyte, temperature, current densities, and electrolysis time.…”

mentioning

confidence: 99%

“…This passive layer will affect the efficiency of ferrate(VI) electrochemical generation and depends on many factors including the anode compositions, the type and concentration of electrolyte, temperature, current densities, and electrolysis time. 27,29 Numerous research has been conducted to determine the optimum Fe (VI) yield, and NaOH is the most acceptable electrolyte with a concentration range of 10 -15 M. 26,30,31 There are many different sources of iron used as anode materials such as iron rod, iron wire, iron gauze, iron coil, sponge iron, grey cast iron, white cast iron, and mild steel with different carbon and silicon content. 29,[31][32][33] Sponge iron and grey cast iron were used as anodes for the electrochemical generation of ferrate(VI), and the ferrate(VI) yield using sponge iron anode was higher than that using grey cast iron anode due to the decline in the passivity of sponge iron.…”

mentioning

confidence: 99%

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Ductile Iron: A Low-Cost Optimal Anode Material for Electrochemical Generation of Ferrate(VI)

Mai,

Nguyen,

Phan

et al. 2023

J. Electrochem. Soc.

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The effects of anode composition and temperature on anode electrochemical properties, the passivation layer’s structure, and ferrate (VI) generation in 14 M NaOH were investigated. Cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic polarization were used to analyze the electrochemical processes involving the electrosynthesis of ferrate using some low-cost anode materials: ductile iron, grey cast iron, and mild steel. The results proved that the presence of silicon and graphite with sphere form in the ductile iron anode significantly increased ferrate electro-generation. The optimal temperature for the electro-generation of ferrate was 30-40°C. The current efficiency using the ductile iron anode was constantly at least about 30% superior to that of the grey cast iron and mild steel electrodes. The ductile iron anode material was the most feasible option because it provides the highest ferrate concentration (1.58 g/L) with the highest current efficiency of 74% and the lowest specific energy consumption of 1.2 kWh/kg ferrate.

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Section: Fe Oh 2esupporting

confidence: 64%

Section: Fe Oh 2ementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Ductile Iron: A Low-Cost Optimal Anode Material for Electrochemical Generation of Ferrate(VI)

Mai,

Nguyen,

Phan

et al. 2023

J. Electrochem. Soc.

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“…Ferrate(VI) can be produced by the chemical or electrochemical synthesis. Ferrate(VI), produced by the electrochemical synthesis, has many advantages compared to the chemically synthesized ferrate(VI) [8,9] such as: simplicity, lower consumption of chemicals, non-toxic products and exceptional purity of the obtained ferrate(VI). Moreover, the electrochemically produced ferrate(VI) has no instability problem and needs no transportation, and due to the ecological advantages, it can be implemented in wastewater treatment practice, in situ.…”

Section: Introductionmentioning

confidence: 99%

Application of ecofrendly oxidant ferrate(vi) in the metallurgical processes of copper extraction

Vojvodić¹,

Nikolić-Bujanović²,

Kurilić³

et al. 2018

Min Metal Eng Bor

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This works deals with investigation the efficiency of sodium ferrate, Na 2 FeO 4 , obtained by the electrochemical oxidation, as coagulation and flocculation agent for purification of wastewater from the electrolytic refining process from the Bor Copper Refinery and Copper Smelter Plant of the Mining and Smelting Combine Bor. Removal of heavy metals and selenium by barium ferrate in aqueous solutions could be possible up to: 100 % for Cu, 97.18 % for As, 98.37 % for Sb and 6.06 % for Se using ferrate(VI) in the ratio M : Fe(VI) = 1:12. Also, the efficiency dependence of copper sulphide ore leaching from concentrate by the oxidation of copper sulfide and chalcopyrite with ferrate(VI) on the sulphuric acid concentration was investigated in this work. It is found that leaching of copper from vthe copper sulfide concentrate, carried out by ferrate(VI), proceeds easily due to the efficient oxidation of sulfide and sulfur, in respect of the classical acid process that usually needs the addition of strong oxidant, such as oxygen or hydrogen peroxide, to increase the process productivity.

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The effect of NaOH concentration on ferrate electrosynthesis

Van Anh,

Binh,

Xuan

et al. 2024

Vietnam Journal of Chemistry

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This study investigated the electrochemical characteristics of mild steel anode in NaOH solutions with concentrations ranging from 8 to 16 m to elucidate their impact on the electrochemical synthesis of ferrate and determine the optimal electrolyte concentration for this process. The electrochemical properties of anode material were determined using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and the Tafel polarization. The ferrate concentration was determined by UV–vis method and the conductivity of electrolytes was evaluated through EIS measurement in the high‐frequent range. The results showed that a passive layer easily formed on the anode surface in NaOH solution with a concentration range of 8–12 m, preventing the formation of ferrate. Conversely, at higher electrolyte concentrations (14 and 16 m NaOH), the dissolution capability of the passive layer was enhanced, resulting in a better ability to synthesize ferrate.

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A comparative study of iron-containing anodes and their influence on electrochemical synthesis of ferrate(VI)

Cited by 16 publications

References 29 publications

Ductile Iron: A Low-Cost Optimal Anode Material for Electrochemical Generation of Ferrate(VI)

Ductile Iron: A Low-Cost Optimal Anode Material for Electrochemical Generation of Ferrate(VI)

Application of ecofrendly oxidant ferrate(vi) in the metallurgical processes of copper extraction

The effect of NaOH concentration on ferrate electrosynthesis

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