Ferrate and Alkaline Chlorination Treatment of Cyanide-Heavy Metal Maritime Wastewater

Reed, Brian E.; Islam, Anjuman A.; Bendick, John

doi:10.1061/(asce)ee.1943-7870.0000676

Cited by 3 publications

(1 citation statement)

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“…The silver cyanides from the photographic, electroplating, and mining industries need to be carefully treated. , Numerous methods, including activated carbon adsorption, ferrate oxidation, and alkaline chlorination, have been investigated for the removal of cyanide from contaminated water. In these processes, the removal of metal cyanide complexes was not complete and the byproducts needed to be treated carefully .…”

Section: Introductionmentioning

confidence: 99%

H₂O₂ Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C₃N₄ Photoanode with Simultaneous Ag Recovery

Yang

Wang

et al. 2017

ACS Sustainable Chem. Eng.

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A g-C 3 N 4 thin film was synthesized by a liquid-based reaction onto ITO substrate via the calcination treatment. The resultant electrode was used as photoanode for photoelectrocatalytic (PEC) oxidation of Ag cyanide complexes with simultaneous Ag recovery, which was enhanced with the addition of H 2 O 2 . Surface variation of the g-C 3 N 4 photoanode and titanium cathode was analyzed using SEM, XRD, and XPS techniques. It was observed that, with the cyanide oxidation, Ag oxides and metal Ag were deposited onto the g-C 3 N 4 photoanode and titanium cathode, respectively. The photoelectrochemical response of the g-C 3 N 4 photoanode was obviously increased after the AgO deposition. ESR and trapping experiments confirmed the existence and roles of • O 2 − and • OH in the PEC oxidation process. The photogenerated electrons from g-C 3 N 4 could be captured by • O 2 − and H 2 O 2 , generating • OH radicals for oxidizing the Ag cyanide complexes. Meanwhile, the deposition of AgO species onto the g-C 3 N 4 surface increased its electrical conductivity and the migration rate of the photogenerated electrons. Deposited AgO can also enhance the production of active radicals, leading to an increased PEC activity toward the cyanide destruction.

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Section: Introductionmentioning

confidence: 99%

H₂O₂ Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C₃N₄ Photoanode with Simultaneous Ag Recovery

Yang

Wang

et al. 2017

ACS Sustainable Chem. Eng.

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Removal of cyanide by peroxydisulfate activated by copper ions inherently present in the electroplating wastewater

Wang,

Cho,

Lin

2024

Journal of Environmental Chemical Engineering

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Oxidation of Ni(II)-cyano and Co(III)-cyano complexes by Ferrate(VI): Effect of pH

Osathaphan

Kittisarn

Chatchaitanawat

et al. 2014

Journal of Environmental Science and Health, Part A

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Free cyanide (CN(-)) and metal-cyanide complexes (tetracyanonickelate(II)), Ni(CN)4(2-) and hexacyanocobaltate(III)), Co(CN)6(3-) are common constituents of effluents of mining, coal gasification, and petroleum refining. This article presents the degradation of Ni(CN)4(2-) and Co(CN)6(3-) by ferrate(VI) (Fe(VI)O4(2-), Fe(VI)) in alkaline media. The effect of pH (9.0-11.0) and reactant molar ratios on the degradation of the cyanide complexes was investigated. The removal of Ni(CN)4(2-) ion in 200 min was found to be > 90% at pH 9.0; forming cyanate (NCO(-)) ions as the stoichiometric products ([Fe(VI)]:[Total CN(-)] = [Fe(VI)]:[NCO(-)] ≈ 1.0). The degradation efficiency decreased with an increase in pH from 9.0 to 11.0. Comparatively, the Co(CN)6(3-) ion could be degraded only up to 10% in 200 min at pH 9.0 and the final oxidized products were nitrite and nitrate ions. The oxidation efficiency of removing Co(CN)6(3-) did not vary significantly with pH. Fe(VI) consumptions as a result of the oxidation of free cyanide and metal-cyanides and their products are compared and discussed.

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Ferrate and Alkaline Chlorination Treatment of Cyanide-Heavy Metal Maritime Wastewater

Cited by 3 publications

References 15 publications

H₂O₂ Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C₃N₄ Photoanode with Simultaneous Ag Recovery

H₂O₂ Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C₃N₄ Photoanode with Simultaneous Ag Recovery

Removal of cyanide by peroxydisulfate activated by copper ions inherently present in the electroplating wastewater

Oxidation of Ni(II)-cyano and Co(III)-cyano complexes by Ferrate(VI): Effect of pH

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Ferrate and Alkaline Chlorination Treatment of Cyanide-Heavy Metal Maritime Wastewater

Cited by 3 publications

References 15 publications

H2O2 Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C3N4 Photoanode with Simultaneous Ag Recovery

H2O2 Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C3N4 Photoanode with Simultaneous Ag Recovery

Removal of cyanide by peroxydisulfate activated by copper ions inherently present in the electroplating wastewater

Oxidation of Ni(II)-cyano and Co(III)-cyano complexes by Ferrate(VI): Effect of pH

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H₂O₂ Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C₃N₄ Photoanode with Simultaneous Ag Recovery

H₂O₂ Assisted Photoelectrocatalytic Oxidation of Ag-Cyanide Complexes at Metal-free g-C₃N₄ Photoanode with Simultaneous Ag Recovery