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Far infrared study of K⁺, Rb⁺ and Cs⁺ during their exchange with Na⁺ and Ca²⁺ in vermiculite

¹ Unité de Science du sol, INRA, Route de Saint Cyr, 78026 Versailles, and ² Laboratoire des Matériaux Minéraux, ENSCM, 3, rue Alfred Werner, 68093 Mulhouse, France

^* E-mail: prost{at}versailles.inra.fr

(Received 28 September 2000; revised 6 April 2001)

All the exchange isotherms of Na⁺ or Ca²⁺ in vermiculite for K⁺, Rb⁺ or Cs⁺ show two kinds of exchanges sites: the first corresponds to sites located in phlogopite-like interlamellar spaces and the second to sites located in smectite-like interlamellar spaces. During the exchange, three mineralogical phases are formed: Na- or Ca-vermiculite; K-, Rb- or Cs-vermiculite and a mixed-layer phase. Far infrared absorption bands of K⁺, Rb⁺ and Cs⁺ located in the phlogopite-like interlamellar spaces are at 72, 59 and 53 cm^–1, respectively. These frequencies are characteristic of a trioctahedral mixed-layer phase. Selectivity is greater for cations with a low hydration energy (K⁺, Rb⁺, Cs⁺) than for cations with a high hydration energy (Na⁺, Ca²⁺). On the other hand, for cations with a low hydration energy, structural parameters such as the tetrahedral rotation angle, , have to be taken into account.

KEYWORDS: b parameters, cation exchange, far infrared spectroscopy, mixed-layer phase, selectivity, vermiculites, X-ray diffraction

This article has been cited by other articles:

				R. BADREDDINE, R. LE DRED, and R. PROST A far infrared study of K+ ions during K+ {rightleftharpoons} Ca2+ exchange in vermiculite Clay Minerals, March 1, 2002; 37(1): 59 - 70. [Abstract] [Full Text] [PDF]