https://doi.org/10.1140/epjst/e2014-02233-8
Review
Cation exchange dynamics confined in a synthetic clay mineral
1 Instituto de Física, Universidade de Brasília, 70.919-970 Brasília – DF, Brazil
2 Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
3 Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
4 Universidade Federal do ABC, 09.210-580 Santo André – SP, Brazil
5 Laboratório de Microhidrodinâmica e Escoamento em Meios Porosos, Department of Mechanical Engineering, Pontifícia Universidade Católica do Rio de Janeiro, 22.451-263 Rio de Janeiro – RJ, Brazil
6 Centro de Componentes Semicondutores, Universidade Estadual de Campinas, 13.083-870 Campinas – SP, Brazil
a e-mail: grassi@unb.br
b e-mail: jon.fossum@ntnu.no
Received: 30 June 2014
Revised: 21 July 2014
Published online: 22 September 2014
In this work we report X-Ray Diffraction (XRD) and Energy Dispersive X-Ray Spectroscopy (EDS) measurements to investigate the confined cation exchange process in saline aqueous suspensions of a synthetic clay mineral from Lithium-Fluorohectorite to Nickel-Fluorohectorite, as well as the reverse process from Nickel-Fluorohectorite to Lithium-Fluorohectorite and also from Lithium-Fluorohectorite to Sodium-Fluorohectorite. The dynamics of these cation exchanges was followed and it was observed that these processes can be faster than 1 minute. The results are compared to the observations on samples prepared by cation exchange procedures for which the exchange process was performed on the time-scale of months.
© EDP Sciences, Springer-Verlag, 2014
