CHANGES IN THE THERMAL STABILITY AND ACIDIC CHARACTERISTICS OF HYDROXY-Al-MONTMORILLONITE COMPLEXES FORMED IN THE PRESENCE OF CITRIC ACID
- 1 August 1985
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Soil Science
- Vol. 65 (3) , 519-522
- https://doi.org/10.4141/cjss85-055
Abstract
The thermal stability and acidic characteristics of Al interlayered montmorillonite were affected by citric acid which was present during its formation. Perturbation to the formation of Al interlayers by citric acid resulted in more gradual loss of their structural water in the 430 °C to 520 °C region at initial citric acid/Al molar ratios of 0.1 and 0.5. The data clearly reveal that, besides hydroxy-Al polymers, hydroxy-Al-citrate complexes adsorbed on the surfaces of montmorillonite very substantially contribute to the total and third buffer range titratable acidity of the clay. Key words: Hydroxy-Al-citrate interlayers, smectite, organic acid, DTA, third buffer range, organic carbonThis publication has 2 references indexed in Scilit:
- FORMATION OF HYDROXY-Al-MONTMORILLONITE COMPLEXES AS INFLUENCED BY CITRIC ACIDCanadian Journal of Soil Science, 1984
- Hydrogen-Aluminum Clays: A Third Buffer Range Appearing in Potentiometric TitrationScience, 1963