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Synthesis and characterization of kanemite from fluoride-containing media; influence of the alkali cation

Juan I. Corredor, Agustin Cota, Esperanza Pavon and Maria D. Alba
Synthesis and characterization of kanemite from fluoride-containing media; influence of the alkali cation
American Mineralogist (May 2013) 98 (5-6): 1000-1007

Abstract

Kanemite belongs to the group of naturally occurring sodium silicate minerals that was first found in Kanem, at the edge of the Lake Chad, and has been synthesized in different ways from NaOH-SiO (sub 2) mixtures and used as precursor for the design of microporous and mesoporous materials. The fluoride route to the synthesis of microporous materials is based on the substitution of OH (super -) anions by fluoride anions, which may subsequently also play a mineralizing role, and gives rise to materials with higher hydrophobicity and thermal and hydrothermal stability. Moreover, F (super -) plays an important role in the incorporation of framework heteroatoms, thereby affecting the activity of the final material. The aim of this study was to synthesize fluorokanemite using different synthetic routes and different F (super -) source. The final product was characterized by a combination of methods that provided information regarding the incorporation of fluorine into the framework and the short- and long-range structural order of the fluorosilicate. Kanemite with water content close to ideal was obtained in all cases. The washing process was found to have no effect in the long- or short-range structural order of the layer framework, although it did affect the structure of the cation in the interlayer space of kanemite. The mineralizing agent therefore appears to be the key to the synthesis. Furthermore, it governs the resulting kanemite structure by controlling the formation of hydrogen bonds in the framework, and therefore the degree of lamellar structure condensation.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 98
Serial Issue: 5-6
Title: Synthesis and characterization of kanemite from fluoride-containing media; influence of the alkali cation
Affiliation: Universidad de Cordoba, Servicio Central del Apoyo a la Investigacion, Resonancia Magnetica Nuclear, Cordoba, Spain
Pages: 1000-1007
Published: 201305
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 56
Accession Number: 2013-046153
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N07°19'60" - N23°30'00", E13°30'00" - E24°00'00"
Secondary Affiliation: Universidad de Sevilla, ESP, SpainUniversite de Lille-Nord de France, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201329
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