Spectroscopic, chemical and morphological characterization and superficial properties of a Mexican montmorillonite

  • Yolanda Marina Vargas-Rodríguez Departamento de Ciencias Químicas, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, Campo 1, 54740 Cuautitlán Izcalli, Estado de México, México.
  • Virginia Gómez-Vidales Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D. F., México.
  • Eloy Vázquez-Labastida Departamento de Ingeniería Química Industrial, ESIQIE, Instituto Politécnico Nacional, Unidad Profesional Adolfo López Mateos, 07738 México, D. F., México.
  • Arturo García-Bórquez Departamento de Ciencias de Materiales, ESFM-IPN, Edif. 9-UPALM, 07738 México D.F., México.
  • Guillermo Aguilar-Sahagún Instituto de Investigación en Materiales, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito Exterior, Del. Coyoacán, 04510 México D. F., México.
  • Héctor Murrieta-Sánchez Instituto de Física, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito Exterior, Del. Coyoacán, 04510 México D. F., México.
  • Manuel Salmón Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D. F., México
Keywords: clay, montmorillonite, magic angle spinning (MAS), Nuclear Magnetic Resonance (NMR), 29Si, 27Al, electronic paramagnetic resonance, X-ray diffraction, thermal analysis.

Abstract

The characterization by means of spectroscopic techniques of a natural montmorillonite collected at Cuencamé, Durango is described. The composition of the tetrahedral and octahedral layers was analyzed by magic angle spinning Nuclear Magnetic Resonance (NMR) for the nuclei of 29Si and 27Al. The superficial properties of the clay were quantified using the technique of adsorption-desorption of nitrogen as well as the Brunahuer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) methods. The results indicate that the analyzed clay is a Na-montmorillonite with a molecular layer of water adsorbed between their laminae, where the Si atoms in the phyllosilicate Q3 structure display different composition of Si-nAl (n = 0, 1 and 2). About 3.3% of the Al atoms in the structure are replacing Si atoms in the layer. The presence of the paramagnetic Fe+3 and Mn +2  ions in the structure was determined by electronic paramagnetic resonance after the analysis of the acidified clay treated with HCl and CF3SO3H. Additionally, the results acquired by atomic absorption, scanning electron microscopy, infrared and gravimetric thermal analysis are discussed.

Published
2018-01-22
Section
Articles