Ni(II) Sorption on Biogenic Mn-Oxides with Varying Mn Octahedral Layer Structure

Manganese-oxidizing bacteria have been widely investigated for bioremediation of Mn-contaminated water sources and for production of biogenic Mn oxides that have extensive applications in environmental remediation. In this study, a total of 5 Mn-resistant bacteria were isolated from river water and investigated for Mn removal. Among them, Ochrobactrum sp. NDMn-6 exhibited the highest Mn removal efficiency (99.1%). The final precipitates produced by this strain were defined as a mixture of Mn2O3, MnO2, and MnCO3. Optimal Mn-removal performance by strain NDMn-6 was obtained at a temperature range of 25–30 °C and the salinity of 0.1–0.5%. More interestingly, strain NDMn-6 could be resistant to salinities of up to 5%, revealing that this strain could be possibly applied for Mn remediation of high salinity regions or industrial saline wastewaters. This study also revealed the potential of self-detoxification mechanisms, wherein river water contaminated with Mn could be cleaned by indigenous bacteria through an appropriate biostimulation scheme.

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Effect of Doping Metal Ions on the Structure Transformation of Octahedral Layer Structure Manganese Oxide

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.723.670 ◽

2015 ◽

Vol 723 ◽

pp. 670-673

Author(s):

Chen Liang Zhou ◽

Bin Zheng Fang ◽

Jian Wei Cao ◽

Na Zhang ◽

Jia Li Han ◽

...

Keyword(s):

Metal Ions ◽

Manganese Oxide ◽

Powder Diffraction ◽

Redox Reactions ◽

Manganese Oxides ◽

Layer Structure ◽

Structure Transformation ◽

Octahedral Layer ◽

X Ray ◽

Before And After

The Octahedral layer structure manganese oxides (Buserite and Birnessite) have been synthesized and modified by aging a MnOx gel which was produced from the redox reactions between Mn2+ and MnO4- in the presence of other metal cations (Mg2+, Ni2+, Co2+ or Cu2+). The present study investigates the structure transformation between Buserite and Birnessite using X-ray powder diffraction conducted on cation doped manganese oxides at different stages of before and after hydration. The results indicate that introduction of Mg2+ into the interlayer can completely achieve the structure transformation between Birnessite and Buserite after hydrated at 24h, and Ni2+ can partially reverse.

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Sorption of Co Ions on Biogenic Mn Oxides Produced by a Mn-Oxidizing Fungus, Paraconiothyrium sp.-like Strain

Advanced Materials Research - Biohydrometallurgy: From the Single Cell to the Environment ◽

10.4028/0-87849-452-9.607 ◽

2007 ◽

pp. 607-610

Author(s):

Keiko Sasaki ◽

M. Matsuda ◽

T. Urata ◽

T. Hirajima ◽

H. Konno

Keyword(s):

Biogenic Mn Oxides ◽

Mn Oxides

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Microbial communities and biogenic Mn-oxides in an on-site biofiltration system for cold Fe-(II)- and Mn(II)-rich groundwater treatment

The Science of The Total Environment ◽

10.1016/j.scitotenv.2019.136386 ◽

2020 ◽

Vol 710 ◽

pp. 136386 ◽

Cited By ~ 1

Author(s):

Sandeepraja Dangeti ◽

Joyce M. McBeth ◽

Babak Roshani ◽

Jonathan M. Vyskocil ◽

Brian Rindall ◽

...

Keyword(s):

Microbial Communities ◽

Groundwater Treatment ◽

Biogenic Mn Oxides ◽

Mn Oxides

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Sorption of Co Ions on Biogenic Mn Oxides Produced by a Mn-Oxidizing Fungus, Paraconiothyrium sp.-like Strain

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.20-21.607 ◽

2007 ◽

Vol 20-21 ◽

pp. 607-610

Author(s):

Keiko Sasaki ◽

M. Matsuda ◽

T. Urata ◽

Tsuyoshi Hirajima ◽

H. Konno

Keyword(s):

Redox Reaction ◽

Mn Oxide ◽

Biogenic Mn Oxide ◽

Biogenic Mn Oxides ◽

Mn Oxides

Sorption of Co(II) on the biogenic Mn oxide produced by a Paraconiothyrium sp.-like strain was investigated. The biogenic Mn oxide, which was characterized to be poorly crystalline birnessite (Na4Mn(III) 6Mn(IV) 8O27 ·9H2O) bearing Mn(III) and Mn(IV) in the structure, showed approximately 6.0-fold higher efficiency for Co(II) sorption than a synthetic Mn oxide. XP-spectra of Co 2p for the biogenic and synthetic Mn oxides after Co(II) sorption indicate that Co was immobilized as Co(III) on the surface of Mn oxides, clearly suggesting that redox reaction occurs between Co(II) ions and each Mn oxides. The Co(II) ions would be initially sorbed on the vacant sites of the surface of biogenic Mn oxide, and then oxidized to Co(III) by neighbor Mn(III/IV) atoms to release Mn(II). For the synthetic Mn oxide, release of Mn(II) was negligibly small because the oxidant is only Mn(IV) in ramsdellite (γ-MnO2). The Mn(II) release from the biogenic Mn oxide during Co(II) adsorption would be not only from weakly bounded Mn(II), but also from redox reaction between Mn(III/IV) and Co(II) ions.

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