Effect of anode passivation on ferrate(VI) electro-generation using ductile iron anode and application for methylene blue treatment

Mai, Thi Thanh Thuy; Anh Nguyen, Thi Van; Phan, Thi Binh

doi:10.1007/s10800-024-02066-3

J Appl Electrochem

2024

DOI: 10.1007/s10800-024-02066-3

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Effect of anode passivation on ferrate(VI) electro-generation using ductile iron anode and application for methylene blue treatment

Thi Thanh Thuy Mai,

Thi Van Anh Nguyen,

Thi Binh Phan

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2024

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Ferrate(VI) green oxidant: electrochemical generation, self‐decomposition, and application for reactive red 195 azo dye treatment

Nguyen,

Mai,

Phan

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDFerrate(VI), an environmentally friendly oxidant, has recently emerged as one of the most promising chemicals for water and wastewater treatment due to its versatile application as an oxidant, coagulant, and disinfectant. In this paper, the factors affecting the electrosynthesis process of ferrate using ductile iron anode were studied. Besides, the obtained ferrate was used to remove reactive red 195 (RR195).RESULTSThe optimal ferrate electrochemical synthesis conditions were determined, including 14 mol L−1 NaOH electrolyte solution, a current density of 40 mA cm−2, and electrolysis time of approximately 5–6 h. Furthermore, the kinetics of the ferrate's self‐decomposition reaction was also studied at different temperatures. The decomposition process of ferrate in a 14 mol L−1 NaOH environment followed second‐order kinetics, with reaction rate constants of 4.70 × 10−9, 7.31 × 10−8, 1.95 × 10−7, and 4.70 × 10−7 (L mol−1 s−1) at temperatures of 4, 10, 20, and 30 °C, respectively. RR195 treatment efficiency by ferrate reached 96.3% in a short time of 3 min at pH 3 with a ferrate/RR195 molar ratio of 30/1.CONCLUSIONThis study identified the optimal conditions for the electrochemical synthesis of ferrate using a ductile iron anode. Ferrate was stable at a low temperature of 4 °C, so unused ferrate needs to be stored at low temperatures to avoid decomposition of ferrate. The ferrate green oxidant demonstrated high efficiency in the treatment of RR195 in a short time. © 2024 Society of Chemical Industry (SCI).

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Ferrate(VI) green oxidant: electrochemical generation, self‐decomposition, and application for reactive red 195 azo dye treatment

Nguyen,

Mai,

Phan

et al. 2024

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

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Effect of anode passivation on ferrate(VI) electro-generation using ductile iron anode and application for methylene blue treatment

Cited by 1 publication

References 46 publications

Ferrate(VI) green oxidant: electrochemical generation, self‐decomposition, and application for reactive red 195 azo dye treatment

Ferrate(VI) green oxidant: electrochemical generation, self‐decomposition, and application for reactive red 195 azo dye treatment

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