Thermal
behavior of Cu(II)-, Cd(II)-, and Hg(II)-exchanged montmorillonite complexedwith
cysteine |
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Authors: | D Malferrari Maria Franca Brigatti Angela Laurora L Medici S Pini |
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Institution: | (1) Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, Modena, Italy, 41100, via S. Eufemia 19;(2) IMAA–CNR, Area della Ricerca di Potenza, Tito Scalo, Potenza, Italy, 85050, Via S. Loja |
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Abstract: | The thermal behavior
of montmorillonite and organically modified montmorillonite, both treated
with heavy metal cations Cu(II), Cd(II) and Hg(II)], was characterized via
thermal analyses (TG, DTG and DTA) combined with evolved species gas mass
spectrometry (MS-EGA), and X-ray diffraction at in situ controlled temperature
(HTXRD). The reactions involving Cu(II)- and Cd(II)-montmorillonite samples
are mostly related to H2O and OH loss, unlike Hg(II)-montmorillonite,
where effects associated to Hg(II) loss are also present. Finally reactions
related to dehydration, dehydroxylation and to organic matter decomposition
can be observed in montmorillonite samples treated with cysteine. |
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Keywords: | Cd(II) Cu(II) cysteine Hg(II) mass spectrometry montmorillonite thermal analyses |
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