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Effect of Tannate, ph, Sample Preparation, Ageing And Temperature on the Formation and Nature of Al Oxyhydroxides

Published online by Cambridge University Press:  01 January 2024

C. Colombo ,
M. Ricciardella ,
A. Di Cerce ,
L. Maiuro  and
A. Violante
C. Colombo*
Affiliation:
Dipartimento di Scienze Animali, Vegetali e dell’ Ambiente, Università del Molise, Via De Sanctis s/n, 86100 Campobasso (CB), Italy
M. Ricciardella
Affiliation:
Dipartimento di Scienze del Suolo della Pianta e dell’ Ambiente, Università di Napoli Federico II, Via Università, 100, 80055 Portici (NA), Italy
A. Di Cerce
Affiliation:
Dipartimento di Scienze Animali, Vegetali e dell’ Ambiente, Università del Molise, Via De Sanctis s/n, 86100 Campobasso (CB), Italy
L. Maiuro
Affiliation:
Centro Servizi Interdipartimentali di Microscopia, Università del Molise, Via De Sanctis s/n, 86100 Campobasso (CB), Italy
A. Violante
Affiliation:
Dipartimento di Scienze del Suolo della Pianta e dell’ Ambiente, Università di Napoli Federico II, Via Università, 100, 80055 Portici (NA), Italy
*
*E-mail address of corresponding author: colombo@unimol.it
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Abstract

The aim of this work was to study the influence of tannate concentration (tannic acid/Al molar ratio [R] of 0.01–0.1), pH (5.0 and 8.0), order of aluminum, hydroxyl, and tannate addition, and prolonged ageing at different temperatures (10 months at 50°C and 5 y at room temperature and further ageing for 3–15 days at 140°C) on the nature and crystallinity of synthetic boehmite. Tannate facilitated the formation of boehmite relative to Al(OH)3 polymorphs when coprecipitated with Al and also when added to Al(OH)x phases already formed at pH 4.5 or 8.0. However, the organic ligand was more effective in preventing or perturbing the growth of the crystals of boehmite when coprecipitated with Al than when added to soluble Al(OH)x species or preformed Al precipitates. Boehmite aged at temperatures ⩽50°C typically showed a fibrous morphology. Crystals with a rhombic habit were observed in some treatments after ageing at 140°C. Significant amounts (15–30% C) of tannate were present in the precipitates after prolonged ageing. This tannate was only partly (<50%) oxidized by repeated treatments with H2O2. With further ageing at 140°C, the crystallite size of selected samples increased only slightly, suggesting that much of the remaining tannate was present in the internal structure of these samples and not simply adsorbed to their surfaces. Atomic force microscopy observation showed the presence of globular nanoparticles (probably Al tannate precipitates) attached to the elongated crystals of boehmite. Taken together, our results demonstrate that the crystalline phases that formed under mild conditions in the presence of low concentrations (R = 0.01) of foreign ligands have the same structure as boehmite, but with a poorly ordered and defective ion arrangement. At higher ligand concentrations (R ⩾0.05), mixtures of materials are formed having varying degrees of order, particle size and morphology.

Keywords

Atomic Force MicroscopyBoehmiteCrystallite SizePoorly Ordered MaterialTannic Acid
Type
Research Article
Information
Clays and Clay Minerals , Volume 52 , Issue 6 , December 2004 , pp. 721 - 733
Copyright
Copyright © 2004, The Clay Minerals Society

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