Special Issue dedicated to Francisco Hervé: Global tectonic processes of the ancient southwestern Gondwana margin in South America and the Antarctic Peninsula
Edited by:
- Mauricio Calderón, PhD, Universidad del Desarrollo, Chile
- Paula Castillo, PhD, Universität Münster, Deutschland
- Robert Pankhurst, PhD ScD, United Kingdom
Submission status: Extended until September 30, 2025
Special Issue: Geoethics in Chile and Latin America - Contextual reflections for responsible geoscience
Edited by:
- Luisa Pinto, Universidad de Chile
- Hernán Bobadilla, Politecnico di Milano
- Tania Villaseñor, Pontificia Universidad Católica de Chile
- Pablo Ramírez, Universidad de Chile
- Millarca Valenzuela, Universidad Católica del Norte
Submission status: Open between August 15, 2025, and March 31, 2026
Institute of Catalysis and Petrochemical Research, National University of the Littoral, Argentina. S3000AOM Santa Fe, Argentina.
Centro de Bioactivos Químicos, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba.
Departamento de Licenciatura en Química, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba. Cuba
Lester Alejandro Arias Felipe
Departamento de Licenciatura en Química, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba. Cuba
Julio Omar Prieto García
Centro de Bioactivos Químicos, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba. Cuba
María Elisa Jorge Rodríguez
Departamento de Licenciatura en Farmacia, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba. Cuba
Jorge Basilio de la Torre López
Departamento de Licenciatura en Química, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba. Cuba
Osvaldo Norman Montenegro
Centro de Bioactivos Químicos, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba. Cuba
Reinaldo Molina Ruíz
Centro de Bioactivos Químicos, Universidad Central "Marta Abreu" de Las Villas. Street to Camajuaní km 5 ½ Santa Clara. CP 54830, Villa Clara, Cuba. Cuba
Inés Silvia Tiscornia
Institute of Catalysis and Petrochemical Research, National University of the Littoral, Argentina. S3000AOM Santa Fe, Argentina. Argentina
Local Cuban bentonite clay: composition, structure and textural characterization
Pedro César Quero-Jiménez, Lester Alejandro Arias Felipe, Julio Omar Prieto García, María Elisa Jorge Rodríguez, Jorge Basilio de la Torre López, Osvaldo Norman Montenegro, Reinaldo Molina Ruíz, Inés Silvia Tiscornia
Abstract
The physic and chemical characterization of the bentonite clay from the Chiqui Gómez deposit, central Cuba, (Cuban bentonite clay) shows that it is mainly constituted by sodium montmorillonite (>90%), with a structural formula for one-layer unit determined as (Na3.99Al0.01)(Al1.11Fe3+0.49Mg0.18Ti0.07)(Ca0.24Na0.15K0.01)O10(OH)2. The Cuban bentonite clay has a specific surface area of 80 m2g-1, a pore volume of about 0.0776 cm3g-1, 61% porosity and both N2 adsorption-desorption isotherms exhibit a hysteresis loop of IV type. The thermogravimetric analysis (TGA) of the studied mineral presents the first endothermic peak, characteristic of montmorillonite, in 48.1 ºC and others less accentuated (80.8, 94.0, 119.8 ºC) characteristic of sodium montmorillonite, that corresponds to the loss of water, and can be extended up to 250 ºC. The FT-IR spectra show the existence of Si-OH, Al-Al-OH, Al-Fe-OH, Al-Mg-OH and Si-O-Si functional groups in all clay samples, bands between 1,120 and 461 cm-1 correspond to phyllosilicate structures and OH stretching vibrations were observed. pH at the point of zero charge (pHPZC) obtained has a value of 8.1, which allows montmorillonite to be classified as basic.