Aqueous Co removal by mycogenic Mn oxides from simulated mining wastewaters

Xu, Tingying; Roepke, Elizabeth W.; Flynn, Elaine D.; Rosenfeld, Carla E.; Balgooyen, Sarah; Ginger-Vogel, Matthew; Schuler, Christopher J.; Santelli, Cara M.

doi:10.1016/j.chemosphere.2023.138467

Cited by 4 publications

(11 citation statements)

References 105 publications

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“…These two radicals are well known as the main ones responsible for removing impurities due to their remarkable redox potential. Moreover, sulfate radical is much more efficient than hydroxyl radical in the degradation of pollutants because of its longer half-life (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) µs compared to 20 ns for hydroxyl radicals, excellent mass transfer, and reactivity [30].…”

Section: Manganese Dioxide Precipitationmentioning

confidence: 99%

“…The negative charge of manganese dioxide is created due to structural features such as edge shared MnO6 octahedra, layer vacancies, and substitution of Mn 4+ by lower valance cations (e.g., Mn 3+ , Co 3+ , Ni 3+ ). This negative charge is compensated by uptaking the surrounding cations of metals in various ways including adsorption, coprecipitation, and oxidation [37,39,40].…”

Section: Cobalt As Catalystmentioning

confidence: 99%

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Towards Using MMO Anodes in Zinc Electrorefining: Mn Removal by Simulated Plant Off-Gas

Askarian,

Mousavi,

Mollaabbasi

et al. 2023

Metals

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Implementing mixed metal oxide (MMO) anodes in zinc electrowinning is highly desired due to the considerable reduction in electrical energy consumption. However, the presence of manganese in the electrolyte is a major obstacle for implementing MMO anodes in the zinc cell houses. In this work, we explore the possibility of using plant off-gas, containing SO2, to remove manganese. A SO2/air gas mixture with different SO2 and O2 concentrations was therefore used for the oxidative precipitation of manganese. It was shown that the manganese oxidation reaction is highly pH-dependent. Calcium hydroxide was used to control the pH during the process. Different operating parameters, i.e., pH, SO2/air ratio, reaction time, and effect of cobalt as a reaction catalyst, were investigated. Optimal conditions for manganese removal were reported. Under the optimal conditions, the manganese concentration decreased from 1 g L−1 to less than 1 mg L−1 within 30 min. Precipitates were characterized using EDS, XRF, and XPS techniques and showed coprecipitation of manganese, zinc, gypsum, and cobalt.

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Section: Manganese Dioxide Precipitationmentioning

confidence: 99%

Section: Cobalt As Catalystmentioning

confidence: 99%

Towards Using MMO Anodes in Zinc Electrorefining: Mn Removal by Simulated Plant Off-Gas

Askarian,

Mousavi,

Mollaabbasi

et al. 2023

Metals

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Section: Effect Of Temperature On the Kinetics Of The Reactionmentioning

confidence: 96%

“…The concentration of cobalt also decreases monotonically with time and its removal rate increases with temperature. The removal of cobalt was also expected since it has been demonstrated that it coprecipitates with Mn, being trapped within the Mn structure [36,37]. Cobalt ions have the highest catalytic activity for peroxymonosulfate (PMS) activation, resulting in the creation of highly reactive oxygen species such as hydroxyl (OH •− ) and sulfate radicals (SO •− 4 ) [25,26,31], which can affect the reaction rate of manganese removal reactions.…”

Section: Effect Of Temperature On the Kinetics Of The Reactionmentioning

confidence: 99%

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Askarian,

Mousavi,

Dufault-Bedard

et al. 2024

Metals

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Removing manganese from zinc electrolytes is necessary to pave the way for replacing lead-based anodes with mixed metal oxide (MMO) anodes. MMO anodes offer significantly lower overpotential towards oxygen evolution reactions, thus are attractive from an energy consumption viewpoint. Previous studies had shown that, thanks to the catalytic effect of cobalt, manganese can be removed successfully from the zinc purification solution through the oxidative precipitation method using a simulated roasting off-gas plant. This study focuses on understanding the primary mechanism behind manganese oxidation precipitation and investigating the influence of various operating parameters such as temperature, dissolved oxygen (DO), and solution potential on the reaction kinetics. The results revealed that the kinetics of the reaction was highly dependent on the temperature and catalyst activity rather than on the reactant concentration. Additives, with radical scavenging effects, were added to identify the radicals responsible for the oxidation of Mn. The manganese oxidation reaction was dramatically suppressed when methanol was added. However, in the presence of tert-butyl alcohol (TBA), a sensible reduction in manganese removal was not observed, suggesting sulfate radical as the predominant species for oxidizing manganese. The physical and chemical characteristics of the sediments were also presented.

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“…Through the screening of microorganisms for Mn(II) oxidation capabilities by using a medium which consisted of 40 mg/L MnSO 4 •5H 2 O, 50 mg/L yeast extract, and 2% agarose ( 1 ), strain TS-2 was obtained as a mycelial colony that accumulated brownish Mn-oxide precipitates and was purified. Members of the fungal genus Periconia have been characterized as endophytic fungi known to produce pharmacologically valuable natural products ( 2 – 4 ), and Mn(II) oxidation in Periconia has rarely been investigated; Mn(II) oxidation was first reported in Periconia in 2023 in strain SM10a2_F1 ( 5 ), and the genome of this organism is not sequenced. Consequently, the genome of strain TS-2 was sequenced, and the functional genes were investigated to expand our understanding of the physiology of this fungal genus.…”

Section: Announcementmentioning

confidence: 99%

Whole-genome sequence of Periconia sp. strain TS-2, an ascomycete fungus isolated from a freshwater outflow and capable of Mn(II) oxidation

Tsushima,

Kanaly,

Mori

2023

Microbiol Resour Announc

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Aqueous Co removal by mycogenic Mn oxides from simulated mining wastewaters

Cited by 4 publications

References 105 publications

Towards Using MMO Anodes in Zinc Electrorefining: Mn Removal by Simulated Plant Off-Gas

Towards Using MMO Anodes in Zinc Electrorefining: Mn Removal by Simulated Plant Off-Gas

Kinetic Study of Manganese Oxidative Precipitation Reaction by Using SO2/Air Gas Mixture

Whole-genome sequence of Periconia sp. strain TS-2, an ascomycete fungus isolated from a freshwater outflow and capable of Mn(II) oxidation

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