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

Published online by Cambridge University Press:  28 February 2024

Maria Franca Brigatti ,
Cristina Lugli ,
Giannantonio Cibin ,
Augusto Marcelli ,
Gabriele Giuli ,
Eleonora Paris ,
Annibale Mottana  and
Ziyu Wu
Maria Franca Brigatti
Affiliation:
Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, via S. Eufemia 19, 41100 Modena, Italy
Cristina Lugli
Affiliation:
Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, via S. Eufemia 19, 41100 Modena, Italy
Giannantonio Cibin
Affiliation:
I.N.F.N., Laboratori Nazionali di Frascati, P.O. Box 13, I-00044 Frascati, Italy
Augusto Marcelli
Affiliation:
I.N.F.N., Laboratori Nazionali di Frascati, P.O. Box 13, I-00044 Frascati, Italy
Gabriele Giuli
Affiliation:
Dipartimento di Scienze della Terra, Università di Camerino, Via Gentile III da Varano, I-62032 Camerino, MC, Italy
Eleonora Paris
Affiliation:
Dipartimento di Scienze della Terra, Università di Camerino, Via Gentile III da Varano, I-62032 Camerino, MC, Italy
Annibale Mottana
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma 3, Largo S. Leonardo Murialdo, 1, I-00146 Roma, Italy
Ziyu Wu
Affiliation:
Centre de Recherche sur la Synthèse et la Chimie des Mineraux, C.N.R.S., 1A rue de la Férollerie, F-45071, Orléans Cedex 2, France
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Abstract

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The reduction of hexavalent chromium species in aqueous solutions by interaction with Fe(II)-bearing solid surfaces was studied using a 0.96 × l0−3 M Cr(VI) solution and iron-rich clays with different Fe(II)/Fe(III) ratios, layer charge, and exchange properties, i.e., chlorite, corrensite, and montmorillonite. Experimental studies demonstrated that Fe(II)-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)/Fe(III) ratio and exchange capacity, adsorbs the greatest amount of chromium.

X-ray absorption spectroscopy at Al, 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 Al 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.

Keywords

AbsorptionChromiumEXAFSPhyllosilicatesReductionXANES
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 2 , April 2000 , pp. 272 - 281
Copyright
Copyright © 2000, The Clay Minerals Society

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