Chromium(VI) Oxidations of Inorganic Substrates

Beattie, James K.; Haight, G. P.

doi:10.1002/9780470166185.ch3

Cited by 49 publications

(13 citation statements)

References 73 publications

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“…Under sterile conditions, the complex is stable, suggesting that the complex does not readily dissociate. This is in agreement with the slow ligand exchange of the Cr(III) complexes, which have dissociation half lives in the order of weeks (Beattie and Haight 1972). However, Leifsonia sp.…”

Section: Discussionsupporting

confidence: 66%

Isolation and characterization of an NAD+-degrading bacterium PTX1 and its role in chromium biogeochemical cycle

et al. 2007

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Microorganisms can reduce toxic chromate to less toxic trivalent chromium [Cr(III)]. Besides Cr(OH)(3) precipitates, some soluble organo-Cr(III) complexes are readily formed upon microbial, enzymatic, and chemical reduction of chromate. However, the biotransformation of the organo-Cr(III) complexes has not been characterized. We have previously reported the formation of a nicotinamide adenine dinucleotide (NAD(+))-Cr(III) complex after enzymatic reduction of chromate. Although the NAD(+)-Cr(III) complex was stable under sterile conditions, microbial cells were identified as precipitates in a non-sterile NAD(+)-Cr(III) solution after extended incubation. The most dominant bacterium PTX1 was isolated and assigned to Leifsonia genus by phylogenetic analysis of 16S rRNA gene sequence. PTX1 grew slowly on NAD(+) with a doubling time of 17 h, and even more slowly on the NAD(+)-Cr(III) complex with an estimated doubling time of 35 days. The slow growth suggests that PTX1 passively grew on trace NAD(+) dissociated from the NAD(+)-Cr(III) complex, facilitating further dissociation of the complex and formation of Cr(III) precipitates. Thus, organo-Cr(III) complexes might be an intrinsic link of the chromium biogeochemical cycle; they can be produced during chromate reduction and then further mineralized by microorganisms.

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Section: Discussionsupporting

confidence: 66%

Isolation and characterization of an NAD+-degrading bacterium PTX1 and its role in chromium biogeochemical cycle

et al. 2007

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“…From the review of Beattie and Haight [20], reduction mechanism of Cr(VI) by hydrazine may be expressed as…”

Section: Reduction Kineticsmentioning

confidence: 99%

“…One of the choices is to reduce and remove the Cr(VI) to produce commercial potassium carbonate. Quite a few methods for the removal of Cr(VI) can be found in the literatures [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], such as biosorption, ion exchange, solvent extraction, nanofiltration, micelle-enhanced ultra filtration, adsorption with inorganic sorbent materials, reduction and precipitation and so on. However, none of them can be directly used to this purpose due to two critical requirements.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Cr(VI) by hydrazine in solution saturated with KHCO3

Tian-gui

2005

Journal of Hazardous Materials

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“…[14][15] It has been reported that the chromate ester has greater stability in organic solvents than in water. [16][17] The large negative S # values implies the formation of a chromate ester with a high degree of orderedness supporting cyclic intermediate formation. Bordwell 18 had ruled out the occurrence of concerted one step bimolecular process by hydrogen transfer and in the present studies also the hydrogen transfer does not occur by an acyclic bimolecular process.…”

Section: Resultsmentioning

confidence: 99%

Kinetics and mechanism of the selective oxidation of primary aliphatic alcohols under phase transfer catalysis

Bijudas¹,

Nair²

2014

10.5267/j.ccl

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Kinetics of the oxidation of primary aliphatic alcohols has been carried out using phase transferred monochromate in benzene. Tetrabutylammonium bromide (TBAB) and tetrabutylphosphonium bromide (TBPB) are used as phase transfer catalysts (PT catalyst). The reaction shows first order dependence on both [alcohol] and [monochromate ion]. The oxidation leads to the formation of corresponding aldehyde and no traces of carboxylic acid has been detected. The reaction mixture failed to induce the polymerization of added acrylonitrile which rules out the presence radical intermediates in the reaction. Various thermodynamic parameters have been evaluated and a suitable mechanism has been proposed.

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Chromium(VI) Oxidations of Inorganic Substrates

Cited by 49 publications

References 73 publications

Isolation and characterization of an NAD+-degrading bacterium PTX1 and its role in chromium biogeochemical cycle

Isolation and characterization of an NAD+-degrading bacterium PTX1 and its role in chromium biogeochemical cycle

Reduction of Cr(VI) by hydrazine in solution saturated with KHCO3

Kinetics and mechanism of the selective oxidation of primary aliphatic alcohols under phase transfer catalysis

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