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Characterization of Natural Clays from Italian Deposits with Focus on Elemental Composition and Exchange Estimated by EDX Analysis: Potential Pharmaceutical and Cosmetic Uses

Published online by Cambridge University Press:  01 January 2024

Valentina Iannuccelli ,
Eleonora Maretti ,
Francesca Sacchetti ,
Marcello Romagnoli ,
Alessia Bellini ,
Eleonora Truzzi ,
Paola Miselli  and
Eliana Leo
Valentina Iannuccelli*
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
Eleonora Maretti
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
Francesca Sacchetti
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
Marcello Romagnoli
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
Alessia Bellini
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
Eleonora Truzzi
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
Paola Miselli
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
Eliana Leo
Affiliation:
Department of Life Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125, Modena, Italy Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, via P. Vivarelli 10, 41125, Modena, Italy
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Purification processes performed on natural clays to select specific clay minerals are complex and expensive and can lead to over-exploitation of some deposits. The present study aimed to examine physicochemical (mineralogy, morphology, size, surface charge, chemical composition, cation exchange capacity [CEC], and pH) and hydration (swelling, wettability, water sorption, and rheological behavior) properties of three native clays from Italian deposits for potential pharmaceutical and cosmetic uses due to the presence of phyllosilicate minerals. Particular emphasis was placed on energy dispersive X-ray (EDX) microanalysis coupled with the ‘cesium method’ to assay clay elemental composition and CEC. One bentonite of volcanic origin (BNT) and two kaolins, one of hydrothermal origin (K-H) and another of lacustrine-fluvial origin (K-L), were evaluated in comparison with a commercial, purified bentonite. The CEC assay revealed the complete substitution of exchangeable cations (Na+ and Ca2+) by Cs+ in BNT samples and CEC values consistent with those of typical smectites (100.64 ± 7.33 meq/100 g). For kaolins, partial substitution of Na+ cations occurred only in the K-L samples because of the interstratified mineral component which has small CEC values (11.13 ± 5.46 meq/100 g for the K-H sample and 14.75 ± 6.58 meq/100 g for the K-L sample). The degree of isomorphous substitution of Al3+ by Mg2+ affected the hydration properties of BNT in terms of swelling, water sorption, and rheology, whereas both of the poorly expandable kaolins exhibited significant water-adsorption properties. The EDX microanalysis has proved to be of considerable interest in terms of providing more information about clay properties in comparison with other commonly used methods and to identify the role played by both chemical and mineralogical composition of natural clays for their appropriate use in pharmaceutical and cosmetic fields.

Keywords

BentoniteCation Exchange CapacityEnergy Dispersive X-ray AnalysisKaolinRheologyWater Sorption
Type
Article
Information
Clays and Clay Minerals , Volume 64 , Issue 6 , December 2016 , pp. 719 - 731
Copyright
Copyright © Clay Minerals Society 2016

Footnotes

An erratum to this article is available online at https://doi.org/10.1007/BF03406058.

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