Microbial manganese oxide formation and interaction with toxic metal ions

Miyata, Naoyuki; Tani, Yukinori; Sakata, Masahiro; Iwahori, Keisuke

doi:10.1263/jbb.104.1

Cited by 167 publications

(90 citation statements)

References 65 publications

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“…Metal adsorption to Mn oxides could occur through three pathways (Tebo et al, 2004;Miyata et al, 2007): (a) surface adsorption on layers or edges of Mn oxides involving the formation of either inner sphere or outer sphere complexes; (b) sorption into the interlayer regions or tunnels; and (c) incorporation into vacancies or substitution for Mn within the mineral lattice structure. In our kinetic experiment, changes in pH were observed when Cd adsorbed to both Mn oxides, while a significant Mn concentration change was only detected in the case of biogenic Mn oxides.…”

Section: Discussionmentioning

confidence: 99%

Biogenic Mn oxides for effective adsorption of Cd from aquatic environment

Meng

Zheng

Zhang

et al. 2009

Environmental Pollution

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Biogenic Mn oxides effectively adsorb Cd from aquatic environments. a r t i c l e i n f o a b s t r a c tBiogenic Mn oxides exert important controls on trace metal cycling in aquatic and soil environments. A Mn-oxidizing bacterium Bacillus sp. WH4 was isolated from Fe-Mn nodules of an agrudalf in central China. The biogenic Mn oxides formed by mediation of this Mn oxidizing microorganism were identified as short-ranged and nano-sized Mn oxides. Cd adsorption isotherms, pH effect on adsorption and kinetics were investigated in comparison with an abiotic Mn oxide todorokite. Maximum adsorption of Cd to the biogenic Mn oxides and todorokite was 2.04 and 0.69 mmol g À1 sorbent, respectively. Thus, the biogenic Mn oxides were more effective Cd adsorbents than the abiotic Mn oxide in the aquatic environment. The findings could improve our knowledge of biogenic Mn oxides formation in the environment and their important roles in the biogeochemical cycles of heavy metals.

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Section: Discussionmentioning

confidence: 99%

Biogenic Mn oxides for effective adsorption of Cd from aquatic environment

Meng

Zheng

Zhang

et al. 2009

Environmental Pollution

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“…Metal ions affect the growth and Mn-oxidizing ability of Mn-oxidizing organisms (52). We evaluated the metal tolerance of Duganella sp.…”

Section: Actinobacteriamentioning

confidence: 99%

Identification of Mn(II)-Oxidizing Bacteria from a Low-pH Contaminated Former Uranium Mine

Akob

Bohu

Beyer

et al. 2014

Appl Environ Microbiol

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e Biological Mn oxidation is responsible for producing highly reactive and abundant Mn oxide phases in the environment that can mitigate metal contamination. However, little is known about Mn oxidation in low-pH environments, where metal contamination often is a problem as the result of mining activities. We isolated two Mn(II)-oxidizing bacteria (MOB) at pH 5.5 (Duganella isolate AB_14 and Albidiferax isolate TB-2) and nine strains at pH 7 from a former uranium mining site. Isolate TB-2 may contribute to Mn oxidation in the acidic Mn-rich subsoil, as a closely related clone represented 16% of the total community. All isolates oxidized Mn over a small pH range, and isolates from low-pH samples only oxidized Mn below pH 6. Two strains with different pH optima differed in their Fe requirements for Mn oxidation, suggesting that Mn oxidation by the strain found at neutral pH was linked to Fe oxidation. Isolates tolerated Ni, Cu, and Cd and produced Mn oxides with similarities to todorokite and birnessite, with the latter being present in subsurface layers where metal enrichment was associated with Mn oxides. This demonstrates that MOB can be involved in the formation of biogenic Mn oxides in both moderately acidic and neutral pH environments.

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“…Birnessite (layer-type MnO 2 ), produced mainly by bacteria and fungi, is a ubiquitous environmental nanoparticle participating in important geochemical processes, particularly metal scavenging (Tebo et al, 2004;Tonkin et al, 2004;Toner et al, 2006, Manceau et al, 2007Miyata et al, 2007). Among the trace metals of major interest, Zn appears to be influenced strongly in its biogeochemical cycling by sorption on birnessite minerals found in soils, aquifers, streams, and wetlands .…”

Section: Introductionmentioning

confidence: 99%

Zinc surface complexes on birnessite: A density functional theory study

Kwon

Refson

Sposito

2009

Geochimica et Cosmochimica Acta

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Biogeochemical cycling of zinc is strongly influenced by sorption on birnessite minerals (layertype MnO 2 ), which are found in diverse terrestrial and aquatic environments. Zinc has been observed to form both tetrahedral (Zn IV ) and octahedral (Zn VI ) triple-corner-sharing surface complexes (TCS) at Mn(IV) vacancy sites in hexagonal birnessite. The octahedral complex is expected to be similar to that of Zn in the Mn oxide mineral, chalcophanite (ZnMn 3 O 7 ·3H 2 O), but the reason for the occurrence of the four-coordinate Zn surface species remains unclear. We address this issue computationally using spin-polarized Density Functional Theory (DFT) to examine the Zn IV -TCS and Zn VI -TCS species. Structural parameters obtained by DFT geometry optimization were in excellent agreement with available experimental data on Zn-birnessites.Total energy, magnetic moments, and electron-overlap populations obtained by DFT for isolated Zn IV -TCS revealed that this species is stable in birnessite without a need for Mn(III) substitution in the octahedral sheet and that it is more effective in reducing undersaturation of surface O at a Mn vacancy than is Zn VI -TCS. Comparison between geometry-optimized ZnMn 3 O 7 ·3H 2 O (chalcophanite) and the hypothetical monohydrate mineral, ZnMn 3 O 7 ·H 2 O, which contains only tetrahedral Zn, showed that the hydration state of Zn significantly affects birnessite structural stability. Finally, our study also revealed that, relative to their positions in an ideal vacancy-free

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Microbial manganese oxide formation and interaction with toxic metal ions

Cited by 167 publications

References 65 publications

Biogenic Mn oxides for effective adsorption of Cd from aquatic environment

Biogenic Mn oxides for effective adsorption of Cd from aquatic environment

Identification of Mn(II)-Oxidizing Bacteria from a Low-pH Contaminated Former Uranium Mine

Zinc surface complexes on birnessite: A density functional theory study

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