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Article

Simultaneous Sequestration of Co2+ and Mn2+ by Fungal Manganese Oxide through Asbolane Formation

1
Department of Environmental Health Sciences, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan
2
Department of Environmental and Life Sciences, School of Food and Nutritional Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan
3
Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai 319-1195, Japan
4
Department of Biological Environment, Akita Prefectural University, Shimoshinjo-Nakano, Akita 010-0195, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Bin Lian
Minerals 2022, 12(3), 358; https://doi.org/10.3390/min12030358
Received: 17 February 2022 / Revised: 12 March 2022 / Accepted: 13 March 2022 / Published: 15 March 2022
Biogenic manganese oxides (BMOs) have attractive environmental applications owing to their metal sequestration and oxidizing abilities. Although Co readily accumulates into Mn oxide phases in natural environments, the Co2+ sequestration process that accompanies the enzymatic Mn(II) oxidation of exogenous Mn2+ remains unknown. Therefore, we prepared newly formed BMOs in a liquid culture of Acremonium strictum KR21-2 and conducted repeated sequestration experiments in a Mn2+/Co2+ binary solution at pH 7.0. The sequestration of Co2+ by newly formed BMOs (~1 mM Mn) readily progressed in parallel with the oxidation of exogenous Mn2+, with higher efficiencies than that in single Co2+ solutions when the initial Co2+ concentrations (0.16–0.8 mM) were comparable to or lower than the exogenous Mn2+ concentration (~0.8 mM). This demonstrates a synergetic effect on Co sequestration. Powder X-ray diffraction showed a typical pattern for asbolane only when newly formed BMOs were treated in Mn2+/Co2+ binary systems, implying that the enzymatic Mn(II) oxidation by newly formed BMOs favored asbolane formation. Cobalt K-edge X-ray absorption near-edge structure measurements showed that both Co(II) and Co(III) participated in the formation of the asbolane phase in the binary solutions, whereas most of the primary Co2+ was sequestered as Co(III) in the single Co2+ solutions, which partly explains the synergetic effects on Co sequestration efficiency in the binary solutions. The results presented here provide new insights into the mechanism of Co interaction with Mn oxide phases through asbolane formation by enzymatic Mn(II) oxidation under circumneutral pH conditions. View Full-Text
Keywords: biogenic manganese oxide; Mn(II) oxidizing fungi; asbolane; heterogenite; birnessite; Co(II) sequestration biogenic manganese oxide; Mn(II) oxidizing fungi; asbolane; heterogenite; birnessite; Co(II) sequestration
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MDPI and ACS Style

Aoshima, M.; Tani, Y.; Fujita, R.; Tanaka, K.; Miyata, N.; Umezawa, K. Simultaneous Sequestration of Co2+ and Mn2+ by Fungal Manganese Oxide through Asbolane Formation. Minerals 2022, 12, 358. https://doi.org/10.3390/min12030358

AMA Style

Aoshima M, Tani Y, Fujita R, Tanaka K, Miyata N, Umezawa K. Simultaneous Sequestration of Co2+ and Mn2+ by Fungal Manganese Oxide through Asbolane Formation. Minerals. 2022; 12(3):358. https://doi.org/10.3390/min12030358

Chicago/Turabian Style

Aoshima, Miku, Yukinori Tani, Rina Fujita, Kazuya Tanaka, Naoyuki Miyata, and Kazuhiro Umezawa. 2022. "Simultaneous Sequestration of Co2+ and Mn2+ by Fungal Manganese Oxide through Asbolane Formation" Minerals 12, no. 3: 358. https://doi.org/10.3390/min12030358

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