Use of the second derivative of TG curves for investigation of the exchanged enterlayer cation in montmorillonite

M. Földvári, P. Kovács-Pálffy, N. Nagy, J. Kónya

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Various cation-exchanged montmorillonites (Li+, Na+, Ba2+, Mg2+, Ca2+, Mn2+, Co2+, Cu2+, Ag+, Cd2+, Hg2+, Al3+, Pb2+ and NH4+) were prepared from calcium montmorillonite and their properties were studied by means of X-ray diffraction and thermal analysis. The two methods give information on the cation exchange in the interlayer space only. X-ray diffraction studies at room temperature arc mainly suitable for estimation of the exchange of cations of different valencies. At 500°C, when the structure is completely collapsed, the d value of montmorillonite depends on the non-hydrated ionic radius of the interlayer cation, but the measurement, interval is limited for fine interpretation. The thermoanalytical method is suitable for a better distinction of different exchangeable cations of higher hydration energy on the basis of the DTG or DDTG curve.

Original languageEnglish
Pages (from-to)547-558
Number of pages12
JournalJournal of Thermal Analysis and Calorimetry
Volume53
Issue number2
Publication statusPublished - 1998

Fingerprint

Bentonite
montmorillonite
Clay minerals
Cations
Positive ions
Derivatives
cations
curves
interlayers
Ion exchange
diffraction
Hydration
X ray diffraction analysis
Thermoanalysis
hydration
calcium
Calcium
thermal analysis
x rays
arcs

Keywords

  • Cation exchange
  • Montmorillonite
  • Thermogravimetry
  • X-ray diffraction

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Use of the second derivative of TG curves for investigation of the exchanged enterlayer cation in montmorillonite. / Földvári, M.; Kovács-Pálffy, P.; Nagy, N.; Kónya, J.

In: Journal of Thermal Analysis and Calorimetry, Vol. 53, No. 2, 1998, p. 547-558.

Research output: Contribution to journalArticle

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AU - Kónya, J.

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