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Interaction between glycine and Na-, Caand Cu-rich smectites

Published online by Cambridge University Press:  09 July 2018

E. Benincasa,
M. F. Brigatti,
C. Lugli,
L. Medici and
L. Poppi
E. Benincasa
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Via S. Eufemia 19, I 41100, Modena, Italy
M. F. Brigatti*
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Via S. Eufemia 19, I 41100, Modena, Italy
C. Lugli
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Via S. Eufemia 19, I 41100, Modena, Italy
L. Medici
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Via S. Eufemia 19, I 41100, Modena, Italy
L. Poppi
Affiliation:
Department of Earth Sciences, University of Modena and Reggio Emilia, Via S. Eufemia 19, I 41100, Modena, Italy
*
*E-mail: brigatti@unimo.it
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Abstract

The interactions between glycine and two Na-, Ca- and Cu-exchanged smectites with different layer-charge location were studied. The sorption of glycine depends on the nature of the interlayer cations (Ca < Na < Cu), and on the type of smectite. Sequential extraction procedures were carried out in order to test the possibility of removing metals and/or glycine from the smectite interlayer. By the end of the treatments, the release of the amino acid from the substrates, with the exception of Cu-rich smectite, was virtually complete. The thermal curves of glycine-smectites confirm the stronger bonding of the amino acid with Cu-exchanged samples, and FTIR spectra indicate that glycine is mainly sorbed in the zwitterionic form. The data obtained suggest that in investigations into mechanisms of the binding of metals by minerals and their subsequent mobilization, amino acids merit close attention.

Keywords

glycinehomoionic smectiteslayer chargeFTIRthermal analysis

Information

Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 4 , September 2000, pp. 635 - 641
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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