Some effects of trivalent chromium exchange of thermo-exfoliated commercial vermiculite

This manuscript presents the investigation on some effects of the CrIII adsorption from aqueous solution by thermally expanded commercial vermiculite. Three effects were studied: 1) contact time between the adsorbent and chromium dissolved in the retention process; 2) adsorbent mass; and 3) concentr...

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Bibliographic Details
Published in:Applied clay science 2014-03, Vol.90, p.96-100
Main Authors: Marcos, Celia, Rodríguez, Irene
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Binding
Chromium
Commercial vermiculite
Dissolution
Earth sciences
Earth, ocean, space
Exact sciences and technology
Heating
Ion exchangers
Mineralogy
Silicates
Thermo-exfoliation
Trivalent chromium
Vermiculite
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Summary:This manuscript presents the investigation on some effects of the CrIII adsorption from aqueous solution by thermally expanded commercial vermiculite. Three effects were studied: 1) contact time between the adsorbent and chromium dissolved in the retention process; 2) adsorbent mass; and 3) concentration of chromium in adsorption. The original and treated vermiculite samples were characterized by X-ray diffraction and infrared spectroscopy. The findings of this study showed, on the one hand, that vermiculite with high mica-like content, after abrupt heating to high temperatures, is very suitable for the recovery of traces of CrIII in waters of relatively high salt content due to its high degree of exfoliation and adsorption coefficient (Kd=0.74×105μgkg−1). On the other hand, that the mica-type structure originated by the sudden heating of vermiculite would have shifted again to that of the vermiculite, due to adsorption of CrIII (probably by ion exchange) and probably its binding with the water trapped in the structure.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2013.12.032