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Effects of clay activation and amine chain length on silica-palygorskite heterostructure properties

Lilya Boudriche, Faiza Bergaya and Amel Boudjemaa
Effects of clay activation and amine chain length on silica-palygorskite heterostructure properties
Clay Minerals (March 2023) 58 (1): 19-25


Various approaches have been used for the preparation of heterostructured materials based on clay minerals, with numerous potential applications offered by the resulting functional materials. In this study, a fibrous clay mineral (palygorskite) and a tetraethyl orthosilicate reagent were used to obtain silica-palygorskite heterostructures. The aim was to highlight the influence of two factors during the preparation process: the effect of acid activation pre-treatment of the palygorskite with HCl and the effect of varying the length of the amine chains used - dodecylamine and butylamine - on the formation and development of silica nanoparticles on the surface of the palygorskite fibres. The silica-palygorskite heterostructures were obtained after the removal of the organic templates by calcination at 500 degrees C. The textural and structural properties of the silica-palygorskite heterostructured samples were determined using various experimental characterization techniques, such as X-ray diffraction, transmission electron microscopy, gas adsorption and Fourier-transform infrared spectroscopy. The experimental variables targeted in this study appeared to have a significant effect on the textural properties of the silica-palygorskite heterostructure obtained. The great specific surface area and the mesoporous, microporous and ultramicroporous volumes as determined using nitrogen and/or carbon dioxide gas adsorption confirm the benefit of combining the acid activation pre-treatment of the fibrous clay mineral with the use of a long-chain amine co-surfactant (dodecylamine). The resulting silica-palygorskite heterostucture has a great specific surface area (628 m (super 2) g (super -1) ) and a well-developed total pore network (V (sub N2) = 0.24 cm (super 3) g (super -1) ; Vultra (CO (sub 2) ) = 0.18 cm (super 3) g (super -1) ). This material will be tested for the removal of volatile organic compounds at low concentrations.

ISSN: 0009-8558
EISSN: 1471-8030
Serial Title: Clay Minerals
Serial Volume: 58
Serial Issue: 1
Title: Effects of clay activation and amine chain length on silica-palygorskite heterostructure properties
Affiliation: Centre de Recherche Scientifique et Technique en Analyses Physico-Chimiques, Tipaza, Brazil
Pages: 19-25
Published: 202303
Text Language: English
Publisher: Cambridge University Press on behalf of the Mineralogical Society of the UK and Ireland, London, United Kingdom
References: 35
Accession Number: 2024-001094
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Interface, Confinement, Materiaux IRS -Univesite d'Oedleans, FRA, France
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2024, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2024
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