The catalytic effect of sodium and lithium ions on coupled sorption-reduction of chromate at the biotite edge-fluid interface

Ilton, Eugene S.; Veblen, David R.; Moses, Carl O.; Raeburn, Stuart P.

doi:10.1016/s0016-7037(97)00185-3

Cited by 30 publications

(26 citation statements)

References 39 publications

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“…This effect would result in interlayer expansion and increased dissolution of the biotite layers, thereby increasing the release of Fe(II). Ilton et al (1997) have also suggested that hydration-expansion of the interlayer during exchange of Na ϩ for K ϩ under acidic conditions facilitated electron transfer to adsorbed Cr(VI) during coupled sorption-reduction of Cr(VI) at the biotite edge-water interface. High concentrations of Na-salts may thus promote the heterogeneous reduction of chromate by iron-bearing phyllosilicates.…”

Section: Chromate Reduction By Biotitementioning

confidence: 99%

Biotite dissolution and Cr(VI) reduction at elevated pH and ionic strength

Bigham

Traina

2005

Geochimica et Cosmochimica Acta

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Section: Chromate Reduction By Biotitementioning

confidence: 99%

Biotite dissolution and Cr(VI) reduction at elevated pH and ionic strength

Bigham

Traina

2005

Geochimica et Cosmochimica Acta

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“…In addition, previous workers have not considered the effects of alkali cations on the heterogeneous reduction of U VI by sheet silicates. Reduction of metals at the biotite edge-fluid interface is strongly dependent on the concentration and type of alkali metal in solution (Ilton and Veblen, 1994;Ilton et al, 1997Ilton et al, , 2000.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous reduction of uranyl by micas: Crystal chemical and solution controls

Ilton

Haiduc

Moses

et al. 2004

Geochimica et Cosmochimica Acta

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“…Furthermore, mobility and sorption of transition metals depend upon the valence state. However, few studies have addressed the heterogeneous oxidation-reduction reactions that involve electron transfer between metals in solution and in soil minerals (White and Peterson, 1996;Ilton et al, 1997;Peterson et al, 1997). In this work, we examine the role of some Fe-rich phyllosilicates for the removal of hexavalent chromium species from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Reduction and Sorption of Chromium by Fe(II)-Bearing Phyllosilicates: Chemical Treatments and X-Ray Absorption Spectroscopy (XAS) Studies

Brigatti

2000

Clays and clay miner.

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Abstract--The reduction of hexavalent chromium species in aqueous solutions by interaction with Fe(lI)-bearing solid surfaces was studied using a 0.96 • l0 3 M Cr(VI) solution and iron-rich clays with different Fe(lI)/Fe(III) ratios, layer charge, and exchange properties, i.e., chlorite, corrensite, and montmorillonite. Experimental studies demonstrated that Fe(lI)-bearing phyllosilicates reduce aqueous Cr(VI) ions at acidic pH. Chlorite and corrensite, owing to the high Fe(II)/Fe(III) ratio, are electrochemically reactive, as rapid Cr(VI) reduction indicated. In contrast, montmorillonite showed minimum to nil reactivity towards Cr(VI). Furthermore, corrensite, which is high in both Fe(II)~'e(III) ratio and exchange capacity, adsorbs the greatest amount of chromium.X-ray absorption spectroscopy at A1, Mg, Fe, and Cr K-edges was used to investigate the adsorbed chromium species. The montmorillonite sample, unaffected by treatment with Cr(VI) solution, displays no change at any investigated edge. Edge shape and energy also do not change for the Mg and A1 spectra in corrensite, and changes are minor in chlorite. By contrast, the Fe K-edge changes both in chlorite and corrensite, and indicates an increase of Fe(III) in treated samples at the expense of pre-existing Fe(II). Cr K-edge spectra show that chlorite and corrensite sorb Cr(III), which implies its reduction from Cr(VI) in the interacting solution.

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The catalytic effect of sodium and lithium ions on coupled sorption-reduction of chromate at the biotite edge-fluid interface

Cited by 30 publications

References 39 publications

Biotite dissolution and Cr(VI) reduction at elevated pH and ionic strength

Biotite dissolution and Cr(VI) reduction at elevated pH and ionic strength

Heterogeneous reduction of uranyl by micas: Crystal chemical and solution controls

Reduction and Sorption of Chromium by Fe(II)-Bearing Phyllosilicates: Chemical Treatments and X-Ray Absorption Spectroscopy (XAS) Studies

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