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Properties of Organo-Mineral Complexes Formed by Different Addition Sequences of Hydroxy-Al, Montmorillonite, and Tannic Acid

Published online by Cambridge University Press:  02 April 2024

A. Buondonno ,
D. Felleca  and
A. Violante
A. Buondonno
Affiliation:
Istituto di Chimica Agraria, Università di Napoli, via Università 100, I-80055 Portici, Italy
D. Felleca
Affiliation:
Istituto di Chimica Agraria, Università di Napoli, via Università 100, I-80055 Portici, Italy
A. Violante
Affiliation:
Istituto di Chimica Agraria, Università di Napoli, via Università 100, I-80055 Portici, Italy
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Abstract

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A study was carried out on the influence of the sequence of addition of montmorillonite, hydroxy-Al ions, and tannic acid ([Al] = 0.015 M; 6 mmole Al/g of clay; tannic acid/Al molar ratio = 0.1) on the nature of organo-clay complexes formed at pH 4.5. A negligible amount of tannate was held on the clay surfaces in the absence of Al, whereas in the presence of Al, hydroxy-Al-tannate species were easily adsorbed on clay surfaces. Their distribution on the external surface and in the interlayer space of montmorillonite, however, was a consequence of how the components reacted with each other. The complexes showed broad X-ray powder diffraction peaks at 15.6 to 19.2 Å at room temperature. They also showed different behavior to preheating, ethylene glycol solvation, and chemical treatments. Whereas tannic acid showed two prominent exothermic peaks at 390° and 510°C, all hydroxy-Al-tannate-mont-morillonite complexes showed a broad exotherm at about 400°–450°C. Some complexes showed, in addition, a small inflection between 350° and 420°C. The complexes also showed distinct differences in cation-exchange capacity, carbon content, extractable Al, titratable acidity, and mode of aggregation after drying.

Keywords

Differential thermal analysisHydroxy-AlInterlayer spaceMontmorilloniteOrgano clayTannic acidX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 3 , June 1989 , pp. 235 - 242
Copyright
Copyright © 1989, The Clay Minerals Society

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