Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (7) Citing Articles via Google Scholar Google Scholar Articles by KOMADEL, P. Articles by KOPPELHUBER-BITSCHNAU, B. Search for Related Content GeoRef GeoRef Citation

Hydration of reduced-charge montmorillonite

P. KOMADEL¹, J. HROBÁRIKOVÁ¹, L’. SMROK¹ and B. KOPPELHUBER-BITSCHNAU²

¹ Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia, and ² Institut für Physikalische und Theoretische Chemie, Technische Universität Graz, Rechbauer Strasse 12, A-8010 Graz, Austria

^* E-mail: uachkomp{at}savba.sk

(Received 28 August 2001; revised 13 March 2002)

A series of reduced-charge montmorillonites with cation exchange capacities of 89, 73, 49 and 29% of the starting mineral was prepared from a Li-saturated smectite (Kriva Palanka, Republic of Macedonia) by heating at 110, 130, 160 and 300°C for 24 h (samples KP110–KP300, respectively). Hydration properties of this series were investigated gravimetrically and by in situ XRD at different relative humidities (RHs). In the gravimetric experiments, higher water contents were observed for desorption than for sorption and hysteresis was present over the whole range of RHs for all the samples. The parent montmorillonite and the samples KP110 and KP130 retained similar amounts of water under the same conditions, thus showing that the decreased negative charge on the layers had minor effect on the water uptake at all investigated RHs. Significantly decreased water content was retained by KP160 while KP300 contained only 8% water at 100% RH. The d₀₀₁ values of the parent montmorillonite and the samples KP110 and KP130 increased with RH, while those of KP160 and KP300 were independent of RH and remained at ~10.4 and ~9.6 Å, respectively.

KEYWORDS: smectite, Li-fixation, charge reduction, swelling, in situ XRD

This article has been cited by other articles:

				P. Komadel, J. Madejova, and J. Bujdak PREPARATION AND PROPERTIES OF REDUCED-CHARGE SMECTITES - A REVIEW Clays and Clay Minerals, August 1, 2005; 53(4): 313 - 334. [Abstract] [Full Text] [PDF]

				L. J. Michot, I. Bihannic, M. Pelletier, E. Rinnert, and J.-L. Robert Hydration and swelling of synthetic Na-saponites: Influence of layer charge American Mineralogist, January 1, 2005; 90(1): 166 - 172. [Abstract] [Full Text] [PDF]

				P. Komadel and P. KOMADEL Chemically modified smectites Clay Minerals, March 1, 2003; 38(1): 127 - 138. [Abstract] [Full Text] [PDF]