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 zwittterionic 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.

Interaction between glycine and Na-, Ca- and Cu-rich smectites / Benincasa, Emanuele; Brigatti, Maria Franca; Lugli, Cristina; L., Medici; Poppi, Luciano. - In: CLAY MINERALS. - ISSN 0009-8558. - STAMPA. - 35:(2000), pp. 635-641. [10.1180/000985500547098]

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

BENINCASA, Emanuele;BRIGATTI, Maria Franca;LUGLI, Cristina;POPPI, Luciano
2000

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 zwittterionic 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.
2000
35
635
641
Interaction between glycine and Na-, Ca- and Cu-rich smectites / Benincasa, Emanuele; Brigatti, Maria Franca; Lugli, Cristina; L., Medici; Poppi, Luciano. - In: CLAY MINERALS. - ISSN 0009-8558. - STAMPA. - 35:(2000), pp. 635-641. [10.1180/000985500547098]
Benincasa, Emanuele; Brigatti, Maria Franca; Lugli, Cristina; L., Medici; Poppi, Luciano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/306205
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