Reduction behaviors of permanganate by microbial cells and concomitant accumulation of divalent cations of Mg2+, Zn2+, and Co2+

Kato, Tomoaki; Yu, Qian; Tanaka, Kohei; Kozai, Naofumi; Saito, Takumi; Ohnuki, Toshihiko

doi:10.1016/j.jes.2019.05.007

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…The SEM and EDS results in this study showed that mineral particles were attached to the mycelium surface, and Co, Sr, and U were accumulated on the mycelium surface. Microbial metabolic activities require the participation of elements and can also interact with heavy metals to jointly regulate the enrichment of heavy metals (Budhraja et al 2019;Kato et al 2019). In this study, the Na, Mn, Cu, Zn, Fe, and K contents decreased with the increase in the nuclide concentration, whereas the Ca and Mo contents increased with the increase in the nuclide concentration.…”

Section: Discussionmentioning

confidence: 61%

Bioconcentration and Tolerance Mechanism of a Trichoderma Strain Exposed to Cobalt, Strontium, and Uranium

Li¹,

Lai²,

Li³

et al. 2022

Preprint

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Microbial enrichment of radionuclides has the advantages of low cost, simple operation, and no secondary pollution, but the enrichment abilities of radionuclides differ. In this study, a Trichoderma fungus with high tolerance to a variety of radionuclides [i.e., cobalt (Co), strontium (Sr), and uranium (U)] was screened from radioactive contaminated soil by analyzing the enrichment characteristics. Combined with non-targeted metabolomics technology, the physiological response mechanism of Trichoderma fungus metabolism to cobalt, strontium and uranium exposure was revealed from the metabolic level. The results showed that the Trichoderma grew well under multi-nuclides exposure, and the Co, Sr, and U accumulated on the mycelium surface of the strain. Their enrichment reached 36.4–96.6 mg/kg, 76.7–239.7 mg/kg, and 268.5–667.0 mg/kg, respectively. With the increase in the multi-nuclides exposure concentration, the element metabolism of the strain changed, and U, Co, and Sr showed a cooperative absorption relationship. The gas chromatograph-mass spectrometer (GC-MS) non-targeted metabolome analysis showed that the amino acid metabolic pathway and the carbohydrate pathway of the strain changed when the Co, Sr, and U concentrations were 100 mg/L. The results showed that Trichoderma has strong enrichment potential and tolerance to Co, Sr, and U and can be used for radionuclide removal.

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Section: Discussionmentioning

confidence: 61%

Bioconcentration and Tolerance Mechanism of a Trichoderma Strain Exposed to Cobalt, Strontium, and Uranium

Li¹,

Lai²,

Li³

et al. 2022

Preprint

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“…For example, the partitioning of Co between seawater and marine ferromanganese crusts is as high as 10 9 , and the second highest of all chemical elements after lead (Pb). 23 Evidences for the strong uptake of Co by MnO2 has aroused the interest of scientists for decades and led to multiple sorption and coprecipitation studies aimed to understand the underlying chemical reaction on abiotic and biogenic MnO2, [24][25][26][27][28][29] and the structure, reactivity, and stability of Co-containing MnO2. [30][31][32][33] Early observations of the Co-MnO2 geochemical association in the 1970s invoked the oxidation of soluble Co(II) to insoluble Co(III) by Mn oxide minerals, [34][35][36] and first direct evidences were obtained in 1979-1983 by Murray, Dillard, and Crowther using XPS.…”

Section: Introductionmentioning

confidence: 99%

“…Manganese dioxides (MnO 2 ) dominate the geochemistry of cobalt (Co) in terrestrial and marine environments. − For example, the partitioning of Co between seawater and marine ferromanganese crusts is as high as 10 9 , the second highest of all chemical elements after lead (Pb) . Evidence for the strong uptake of Co by MnO 2 has aroused the interest of scientists for decades and led to multiple sorption and coprecipitation studies aimed to understand the underlying chemical reaction on abiotic and biogenic MnO 2 − and the structure, reactivity, and stability of Co-containing MnO 2 . − …”

Section: Introductionmentioning

confidence: 99%

Density Functional Theory Modeling of the Oxidation Mechanism of Co(II) by Birnessite

Manceau

Steinmann

2022

ACS Earth Space Chem.

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Phyllomanganates of the birnessite family are the most abundant manganese oxides on Earth and the strongest inorganic oxidants in the environment. Birnessite controls the oxidative scavenging of cobalt in soils, lake and marine sediments, and ferromanganese crusts and nodules, leading to enrichments of the order of one billion times the concentration in solution. However, a detailed mechanistic understanding of the enrichment processes is lacking. Here, we perform density functional theory (DFT) calculations to explore the mechanisms of Co(II) to Co(III) oxidation on the layer edge and surface of birnessite nanoparticles. We show that Co(II) sorption on a layer edge is an unlikely oxidation pathway. In contrast, Co(II) sorbed on a Mn(IV) vacancy site exposed on the layer surface as an octahedral triple-corner sharing (TCS) complex enters the vacancy where it is oxidized to Co(III) by a layer Mn(IV) cation, which is reduced to Mn(III). The stepwise reaction proceeds as follows. The octahedral TCS complex is transformed to a smaller tetrahedral TCS complex, allowing Co(II) to cross the surface oxygen layer and to fill the empty octahedral Mn(IV) site. When in the octahedral vacancy, Co(II) is converted from the high-spin (t2g 5 eg 2 ) to the low-spin (t2g 6 eg 1 ) state and the Co(II) octahedron becomes strongly distorted by the Jahn-Teller effect. Afterward, the electron exchange reaction between Mn(IV) (t2g 3 eg 0 ) and Co(II) (t2g 6 eg 1 ) takes place, resulting in the formation of a regular lowspin Co(III) (t2g 6 eg 0 ) octahedron and a Jahn-Teller distorted high-spin Mn(III) (t2g 3 eg 1 ) octahedron.These findings refine previously proposed mechanisms of Co(II) oxidation by birnessite and fill gaps in our understanding of global Co sequestration in natural systems.

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Kinetics of permanganate–sulfuric acid redox reaction with cetyltrimethylammonium bromide

Zaheer,

Bawazir,

Bahaidarah

et al. 2024

Int J of Chemical Kinetics

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The permanganate–H2SO4 redox reaction, useful in oxidative treatments under aqueous conditions, was studied spectrophotometrically in the absence and presence of cetyltrimethylammonium bromide (CTAB). The decolorization reactions were influenced by the [MnO4−], [H2SO4], and temperature. Permanganate reduction follows first‐, and complex–order kinetics with permanganate, and H2SO4 concentrations, respectively. The reduction of permanganate (Mn(VII)) proceeds through a complex formation between MnO4− and H2SO4. The characteristic absorption peaks for MnO42− (λmax = 439 and 606 nm), MnO43− (λmax = 667 nm), and MnO2 (λmax = 400–418 nm) were not appeared during the redox reaction. The KMnO4 degradation efficiency remains unaffected with sodium pyrophosphate and sodium fluoride. The results of this study demonstrated the formation of Mn(II) as the stable product in acidic reaction media. The degradation efficiency increases drastically from 15 to 100% with 2.0 × 10−4 to 16.0 × 10−4 mol/L CTAB concentration under sub‐, and post‐micellar reaction conditions, respectively. The thermodynamic parameters (activation energy = 98.8 and 43.2 kJ/mol), activation of enthalpy (96.3, and 39.0 kJ/mol), activation of entropy (16.2 and −149.5 J/K/mol), free energy of activation (93.1 and 83.5 kJ/mol) were calculated without and with CTAB, respectively. Hence, CTAB can be exploited for its multifunctional applications, and specifically for the catalytic role in the permanganate‐assisted redox reactions in future.

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Reduction behaviors of permanganate by microbial cells and concomitant accumulation of divalent cations of Mg2+, Zn2+, and Co2+

Cited by 4 publications

References 40 publications

Bioconcentration and Tolerance Mechanism of a Trichoderma Strain Exposed to Cobalt, Strontium, and Uranium

Bioconcentration and Tolerance Mechanism of a Trichoderma Strain Exposed to Cobalt, Strontium, and Uranium

Density Functional Theory Modeling of the Oxidation Mechanism of Co(II) by Birnessite

Kinetics of permanganate–sulfuric acid redox reaction with cetyltrimethylammonium bromide

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