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Hydrothermal Synthesis of Mg-Rich and Mg-Ni-Rich Kaolinite

Published online by Cambridge University Press:  01 January 2024

Maria Bentabol ,
Maria Dolores Ruiz Cruz ,
Francisco Javier Huertas  and
Jose Linares
Maria Bentabol
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Spain
Maria Dolores Ruiz Cruz*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Spain
Francisco Javier Huertas
Affiliation:
Estación Experimental del Zaidín, CSIC, Prof. Albareda 1, 18008 Granada, Spain
Jose Linares
Affiliation:
Estación Experimental del Zaidín, CSIC, Prof. Albareda 1, 18008 Granada, Spain
*
*E-mail address of corresponding author: mdruiz@uma.es
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Abstract

Mg-rich kaolinite and Mg+Ni-rich kaolinite have been synthesized in hydrothermal experiments (200 and 400°C) from poorly crystalline kaolinite and Mg- and Mg+Ni-bearing solutions. Al-rich serpentine and Al-rich chlorite were obtained as sub-products of the reactions. The formation of these phases occurred through a dissolution-precipitation mechanism that led to spherical kaolinite after short reaction times. A morphological evolution towards platy particles and stacks occurred at increasing run times.

Identification of the several phases was carried out using a combination of X-ray diffraction and transmission/analytical electron microscopy. Analytical data indicate that the Mg content in kaolinite increased as a function of the reaction time and temperature, reaching up to 0.46 atoms per half formula unit (a.p.h.f.u.). The measured (Mg+Ni) content reached up to 0.56 a.p.h.f.u.. Both the gradual increase of the b-cell parameter of kaolinite at increasing Mg contents and the presence of new bands on the FTIR spectra of the synthesized kaolinite point to a Mg-for-Al replacement in the octahedral sheet rather than to the presence of serpentine-like layers interstratified in the kaolinite structure.

Keywords

Al-rich SerpentineFTIRHydrothermal SynthesisMg-rich KaoliniteTEM/AEMXRD

Information

Type
Research Article
Information
Clays and Clay Minerals , Volume 54 , Issue 6 , December 2006 , pp. 667 - 677
Copyright
Copyright © 2006, The Clay Minerals Society

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