Redox Interactions of Cr(VI) and Substituted Phenols: Products and Mechanism

Elovitz, Michael S.; Fish, William

doi:10.1021/es00008a010

Cited by 112 publications

(77 citation statements)

References 57 publications

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“…These Cr(VI) complexes are generally very unstable and are therefore rapidly transformed to subsequent intermediates with lower chromium oxidation states by the intramolecular transfer of electrons (Cieślak-Golonka and Daszkiewicz 2005; Elovitz and Fish 1995;Szulczewski et al 2001). In these redox reactions, the oxygen-containing groups are oxidized and the Cr(VI) is reduced to Cr(III).…”

Section: Diffuse Reflectance Infrared Fourier Transform Spectroscopy mentioning

confidence: 99%

Kinetic Study of the Effect of pH on Hexavalent and Trivalent Chromium Removal from Aqueous Solution by Cupressus lusitanica Bark

Netzahuatl-Muñoz

Guillén-Jiménez

Chávez-Gómez

et al. 2011

Water Air Soil Pollut

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Solution pH is among the most important parameters that influence heavy metal biosorption. This work presents a kinetic study of the effects of pH on chromium biosorption onto Cupressus lusitanica Mill bark from aqueous Cr(VI) or Cr(III) solutions and proposes a mechanism of adsorption. At all assayed contact times, the optimum pH for chromium biosorption from the Cr(III) solution was 5.0; in contrast, optimum pH for chromium biosorption from the Cr(VI) solution varied depending on contact time. The kinetic models that satisfactorily described the chromium biosorption processes from the Cr(III) and Cr (VI) solutions were the Elovich and pseudo secondorder models, respectively. Diffuse reflectance infrared Fourier transform spectroscopy studies suggest that phenolic compounds present on C. lusitanica Mill bark play an important role in chromium biosorption from the Cr(III) solution. On the other hand, chromium biosorption from the Cr(VI) solution involved carboxyl groups produced on the bark by redox reactions between oxygen-containing groups and Cr(VI), and these were in turn responsible for the biosorption of Cr (III) produced by Cr(VI) reduction.

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Section: Diffuse Reflectance Infrared Fourier Transform Spectroscopy mentioning

confidence: 99%

Kinetic Study of the Effect of pH on Hexavalent and Trivalent Chromium Removal from Aqueous Solution by Cupressus lusitanica Bark

Netzahuatl-Muñoz

Guillén-Jiménez

Chávez-Gómez

et al. 2011

Water Air Soil Pollut

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“…The attainment of irreversible reduction is a prerequisite because of the possibility of reoxidation of Cr(III) back to Cr(VI) by manganese oxides under favorable soil conditions. Several effective Cr(VI) reducing agents have been tried including the ferrous iron (Eary and Rai 1988), sulfide (Pettine et al 1994), and organic complexes (Elovitz and Fish 1995;Deng and Stone 1996;Lay and Levina 1996). Additionally, direct enzymatic reduction of chromate has been demonstrated by a number of soil microorganisms (Ishibashi et al 1990;Llovera et al 1993).…”

Section: Irreversible Reduction Of Cr(vi) To Cr(iii)mentioning

confidence: 99%

Chemistry of Chromium in Soils with Emphasis on Tannery Waste Sites

Avudainayagam

Megharaj

Owens

et al. 2003

Reviews of Environmental Contamination and Toxicology

118

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“…The FYM plays an important role in Cr(VI) reduction by virtue of functional groups such as hydroquinones. The hydroquinone groups of DOC were identified as the major source of electron donor for the reduction of Cr(VI) to Cr(III) in soils (Elovitz and Fish 1995):…”

Section: Resultsmentioning

confidence: 99%

Conjunctive effect of CMC–zero-valent iron nanoparticles and FYM in the remediation of chromium-contaminated soils

et al. 2013

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Chromium is an important industrial metal used in various products and processes but at the same time causing lethal environmental hazards. Remediation of Cr-contaminated soils poses both technological and economic challenges, as conventional methods are often too expensive and difficult to operate. Zero-valent iron particles at nanoscale are proposed to be one of the important reductants of Cr(VI), transforming the same into nontoxic Cr(III). In the present investigation, soils contaminated with Cr(VI) are allowed to react with the various loadings of zero-valent iron nanoparticles (Fe 0 ) for a reaction period of 24 h. Fe 0 nanoparticles were synthesized by the reduction of ferrous sulfate in the presence of sodium borohydride and stabilized with carboxy methyl cellulose and were characterized by scanning electron microscopy, energy dispersion spectroscopy, X-ray diffraction, UV-vis spectrophotometer, Fourier transform-infra red spectrophotometer, Raman spectroscopy, dynamic light scattering technique and zeta potential. Further, this work demonstrates the potential utilization of farm yard manure (FYM) and Fe 0 nanoparticles in combination and individually for the effective remediation of Cr(VI)-contaminated soils. An increase in the reduction of Cr(VI) from 60 to 80 % was recorded with the increase in the loading of Fe 0 nanoparticles from 0.1 to 0.3 mg/100 g individually and in combination with FYM ranging from 50 to 100 mg/100 g soil.

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Redox Interactions of Cr(VI) and Substituted Phenols: Products and Mechanism

Cited by 112 publications

References 57 publications

Kinetic Study of the Effect of pH on Hexavalent and Trivalent Chromium Removal from Aqueous Solution by Cupressus lusitanica Bark

Kinetic Study of the Effect of pH on Hexavalent and Trivalent Chromium Removal from Aqueous Solution by Cupressus lusitanica Bark

Chemistry of Chromium in Soils with Emphasis on Tannery Waste Sites

Conjunctive effect of CMC–zero-valent iron nanoparticles and FYM in the remediation of chromium-contaminated soils

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