Mechanisms of nickel sorption by a bacteriogenic birnessite

Peña, J. Theodore; Kwon, Kideok D.; Refson, Keith; Bargar, John R.; Sposito, Garrison

doi:10.1016/j.gca.2010.02.035

Cited by 119 publications

(93 citation statements)

References 54 publications

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“…6b) show a major peak near 1.5 Å (R + dR), corresponding to the first shell of oxygen atoms surrounding Cu. The absence of a prominent second-shell peak near 3 Å (R + dR) contrasts the FT EXAFS spectra from Cu-δ-MnO 2 [pH 4 (Manceau et al, 2007b)], Cu-biogenic MnO 2 [pH 6 (Peña, 2009)], and Ni and Zn-MnO 2 [pH 4-8 Manceau et al, 2007b;Peacock and Sherman, 2007b;Peña et al, 2010)] where the metal adsorbs mainly as a TCS species at the vacancy sites. Instead, the FTs of our EXAFS spectra show two small second-shell peaks at ca.…”

Section: Qualitative Interpretation Of the Exafs Spectramentioning

confidence: 98%

Copper sorption by the edge surfaces of synthetic birnessite nanoparticles

2015

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a b s t r a c tWe investigated the sorption of Cu by δ-MnO 2 , an analog for natural birnessite (layer-type Mn oxide) that is characterized by randomly stacked and curled nanosheets, a low to moderate vacancy content, and variable amounts of layer and interlayer Mn 3+ . The synthetic δ-MnO 2 used in this study had a Na:Mn molar ratio of 0.13, an average manganese oxidation number (AMON) of 3.85 after reaction, a specific surface area of 254 m 2 g −1 and a particle size of 2-4 nm in the ab plane. The maximum surface excess (q max ) value at pH 6 estimated from sorption data of 0.72 (0.64-0.83, 95% confidence interval) mol Cu mol −1 Mn far exceeded the nominal vacancy content for δ-MnO 2 (ca. 6-11% mol vacancy mol −1 Mn), thus implicating multiple binding sites for Cu. The large values of q max and specific surface area of the mineral suggest a major role for surface sites at the particle edges relative to vacancy sites. The extended X-ray absorption fine structure (EXAFS) spectra from δ-MnO 2 samples differ with respect to the EXAFS spectra for Cu(OH) 2 , CuO, and Cu 3 (CO 3 ) 2 (OH) 2 and Cu-sorbed by biogenic MnO 2 . The Cu K-edge EXAFS spectra show two second-shell peaks that can be modeled with Mn and Cu nearneighbors. Copper appears to bind dominantly at particle edges of δ-MnO 2 as dimers or polynuclear surface species. This sorption mechanism is consistent with the moderate vacancy content of δ-MnO 2 and explains the similarity in the EXAFS spectra from samples having surface loadings of 0.01 to 0.26 mol Cu mol −1 Mn. The strong proclivity of Cu to bind on the edge surfaces of nanoparticulate birnessite leads to very large surface excesses of Cu without the formation of a discreet precipitate, making the surface sites at the particle edges the dominant sorption site for Cu.

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Section: Qualitative Interpretation Of the Exafs Spectramentioning

confidence: 98%

Copper sorption by the edge surfaces of synthetic birnessite nanoparticles

2015

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“…In comparison, adsorption of Pb on birnessite could be as high as 2.3 mmol/g ). Adsorption of Ni on a birnessite was attributed to cation exchange with a capacity at 0.44 mmol/g at pH 7 (Peña et al 2010). With a CEC of 1.43 mmol c /g, the charge density would be about 16 Å 2 .…”

Section: Sorption Mechanism and Limiting Factormentioning

confidence: 99%

Sorption and desorption of tetracycline on layered manganese dioxide birnessite

Jiang

Chang

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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Birnessite is one of the most common manganese oxides in the clay-sized fraction (\2 lm) of soils and has high cation exchange capacity and larger surface area. Birnessite was previously studied for decomposition of selected antibiotics from water. In this study, the removal of tetracycline (TC) by birnessite from aqueous solution was investigated as a function of initial tetracycline concentration, solution pH, temperature, and equilibrium time. Changes in solid phase after TC adsorption and desorption were characterized by X-ray photoelectron spectroscopy, X-ray diffraction (XRD), and Fourier transform infrared analyses. Desorption of exchangeable cations accompanying TC removal and partial desorption of TC from birnessite by AlCl 3 confirmed that cation exchange was responsible for TC removal at low initial concentrations. Both the external and internal surface areas were readily available for TC uptake by birnessite. The intercalated TC formed a horizontal monolayer configuration in the interlayer of birnessite as deduced from XRD analyses.

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“…In addition, Mn oxidation has been speculated to provide other advantages to the cell, such as abiotic oxidation of refractory organic matter by Mn oxides (3) or controlling the availability of toxic metal ions (2,3,19). Biogenic Mn oxides are effective metal sorbents (2,(20)(21)(22)(23), with two to five times more Pb-adsorbing capacities than abiotic Mn oxides and crystalline MnO 2 minerals (20). However, this previous work was performed with model microorganisms cultivated at neutral pH, and little is known about the advantages of MOB in low-pH metal-contaminated environments.…”

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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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Mechanisms of nickel sorption by a bacteriogenic birnessite

Cited by 119 publications

References 54 publications

Copper sorption by the edge surfaces of synthetic birnessite nanoparticles

Copper sorption by the edge surfaces of synthetic birnessite nanoparticles

Sorption and desorption of tetracycline on layered manganese dioxide birnessite

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

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