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Article

Relationship between Textural Parameters of Lamellar Products Obtained by Acid Activation of Pure and Commercial Vermiculites and Their Iron and Water Content

1
Geology Department & Organometallic Chemical Institute “Enrique Moles”, University of Oviedo, Jesús Arias de Velasco s/n, 33005 Oviedo, Asturias, Spain
2
Laboratory of High-Resolution Transmission Electron Microscopy, Institute for Scientific and Technological Resources, University of Oviedo, Edificio Severo Ochoa s/n, Campus de El Cristo, 33006 Oviedo, Asturias, Spain
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 661; https://doi.org/10.3390/min10080661
Received: 3 July 2020 / Revised: 17 July 2020 / Accepted: 22 July 2020 / Published: 26 July 2020
(This article belongs to the Special Issue Environmental Applications of Chemically Modified Clay Minerals)
The relationship between textural parameters (specific superficial area (SBET) and porosity (Vp)) of lamellar products obtained from HNO3-activated vermiculites and their iron and water content has been established. Two commercial vermiculites, one thermoexfoliated commercial vermiculite, and one pure vermiculite were nitric-acid-treated at 4 and 8 M concentrations for 1, 3, and 7 days. Untreated and treated samples were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and N2 physisorption analysis. The untreated vermiculites showed a direct relationship between their iron content and the values of SBET, Vp, and pore size; an inverse relationship was observed in the case of the treated samples. The iron content may prevent further leaching of cations but not water loss, therefore forming lamellar products with lower SBET and Vp values. The SBET and Vp values of the studied thermoexfoliated sample were higher than those of the starting sample. The SBET and Vp values of the activated thermoexfoliated sample were lower than those of the activated non-thermoexfoliated sample. View Full-Text
Keywords: vermiculite; thermoexfoliated vermiculite; nitric acid treatment; specific surface area; porosity vermiculite; thermoexfoliated vermiculite; nitric acid treatment; specific surface area; porosity
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MDPI and ACS Style

Marcos, C.; Adawy, A.; Rodríguez, I. Relationship between Textural Parameters of Lamellar Products Obtained by Acid Activation of Pure and Commercial Vermiculites and Their Iron and Water Content. Minerals 2020, 10, 661. https://doi.org/10.3390/min10080661

AMA Style

Marcos C, Adawy A, Rodríguez I. Relationship between Textural Parameters of Lamellar Products Obtained by Acid Activation of Pure and Commercial Vermiculites and Their Iron and Water Content. Minerals. 2020; 10(8):661. https://doi.org/10.3390/min10080661

Chicago/Turabian Style

Marcos, Celia, Alaa Adawy, and Irene Rodríguez. 2020. "Relationship between Textural Parameters of Lamellar Products Obtained by Acid Activation of Pure and Commercial Vermiculites and Their Iron and Water Content" Minerals 10, no. 8: 661. https://doi.org/10.3390/min10080661

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