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Article Dans Une Revue Clays and Clay Minerals Année : 2015

Key Steps Influencing the Formation of Aluminosilicate Nanotubes by the Fluoride Route

Résumé

Imogolite is usually formed by means of a three-step process involving the use of large amounts of water with long crystallization times and low yields, preventing large-scale synthesis. These drawbacks can be overcome by synthesis in the presence of fluoride, an approach which has

been demonstrated to be suitable for the synthesis of other phyllosilicates. In the present study, the nature of the Al and Si sources, the Al/Si molar ratio, the volume of H2O for the redispersion of the gel after desalination, the F/Si molar ratio, as well as the crystallization

temperature and time have been varied to investigate their role in the crystallization of imogolite. The structural properties of the as-synthesized samples were characterized by X-ray diffraction, infrared spectroscopy, and 29Si, 27Al, and 19F magic angle

spinning nuclear magnetic resonance spectroscopy. The results show that the imogolite nanotubes can be prepared with high yields (>55%) from AlCl3·6H2O and Na4SiO4 aqueous solutions with an Al/Si molar ratio of 2.5, addition of HF for a

F/Si molar ratio of 0.1 À 0.2, and 4 days of crystallization at 98°C.

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Dates et versions

hal-04555438 , version 1 (22-04-2024)

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Atika Chemmi, Jocelyne Brendle, Claire Marichal, Bénédicte Lebeau. Key Steps Influencing the Formation of Aluminosilicate Nanotubes by the Fluoride Route. Clays and Clay Minerals, 2015, 63 (2), pp.132-143. ⟨10.1346/ccmn.2015.0630205⟩. ⟨hal-04555438⟩
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