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Uptake of Lanthanides by Vermiculite

Published online by Cambridge University Press:  02 April 2024

Pascual Olivera Pastor ,
Enrique RodríGuez-Castellon  and
Aurora Rodríguez García
Pascual Olivera Pastor
Affiliation:
Departemento de Química Inorgánica, Cristalografia y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
Enrique RodríGuez-Castellon
Affiliation:
Departemento de Química Inorgánica, Cristalografia y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
Aurora Rodríguez García
Affiliation:
Departemento de Química Inorgánica, Cristalografia y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
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Abstract

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The uptake of Ce3+, Nd3+, Gd3+, Er3+, and Lu3+ on vermiculite was studied using cation-exchange measurements, infrared spectroscopy (IR), and X-ray powder diffraction (XRD). The reaction was followed by measuring the amount of lanthanide ions (Ln3+) taken up by n-butylammonium-ex-changed vermiculite in relation to amount of Ln3+ salt added and the pH of the equilibrium solution. The amount of Ln3+ taken up in excess of the CEC value increased with the hydration energy of the lanthanide ion and with the pH of the n-butylammonium-exchanged vermiculite suspension. At equilibrium solution pHs of 3–4.5, the uptake of Ln3+ ions was only slightly greater than the CEC, whereas at pHs >4.5 the amount taken up by the vermiculite increased sharply. The uptake of Ln3+ ions beyond the CEC of the vermiculite is probably related to the hydrolysis of Ln3+ ions on the vermiculite interlayer surface. The appearance of a band at 1715–1720 cm−1 in the IR spectra of the Ln3+-exchanged vermiculite suggests a strongly acidic medium in the interlayer space. The Ln3+-exchanged vermiculites gave XRD patterns having 002/001 intensity ratios greater than that of Mg-exchanged vermiculite.

Keywords

Hydration energyHydrolysisInfrared spectroscopyIon exchangeLanthanide ionsVermiculiteX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 1 , February 1988 , pp. 68 - 72
Copyright
Copyright © 1988, The Clay Minerals Society

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