Modification of the adsorption properties of montmorillonite by the thermochemical treatment

Authors

  • Olga V. - Dorzhieva PhD-student at the Institute of geology of ore deposits, petrography, mineralogy and geochemistry of Russian Academy of Sciences; Geological Institute, Russian Academy of Science, Lead Research Trainee at Laboratory of Physical Methods for the Study of Rock-forming Minerals, junior research fellow; Moscow, Russian Federation; dorzhievaov@gmail.com
  • Sergey V. Zakusin PhD-student of geological faculty at Lomonosov Moscow State University; Laboratory of crystal chemistry of minerals, Institute of geology of ore deposits, petrography, mineralogy and geochemistry of Russian Academy of Sciences, junior research fellow; Moscow, Russian Federation; zakusinsergey@gmail.com
  • Ekaterina A. Tyupina PhD in technical sciences, D. Mendeleyev University of Chemical Technology of Russia, Department of High-Energy Chemistry and Radioecology, associate professor, vice head of department; Moscow, Russian Federation; tk1972@mail.ru
  • Victoria V Krupskaya PhD in geological and mineralogical sciences, Laboratory of crystal chemistry of minerals, Institute of geology of ore deposits, petrography, mineralogy and geochemistry of Russian Academy of Sciences; geological faculty of Lomonosov Moscow State University, senior research fellow; Moscow, Russian Federation; krupskaya@ruclay.com
  • Anatoly P. Zhuhlistov PhD in geological and mineralogical sciences, Laboratory of crystal chemistry of minerals, Institute of geology of ore deposits, petrography, mineralogy and geochemistry of Russian Academy of Sciences, leading research fellow; Moscow, Russian Federation; anzhu@igem.ru

DOI:

https://doi.org/10.17308/sorpchrom.2015.15/343

Keywords:

montmorillonite, bentonite clays, Tagansky deposit, structure modification, thermochemical treatments, adsorption properties, engineering barriers.

Abstract

The results of the study on changes in the structure and surface properties of montmorillonite from
Tagansky deposit from exposure to nitric acid of varying duration at an elevated temperature are presented in
this work. Treatment with 1M HNO3 solution causes partial leaching of octahedral and interlayer cations
which leads to protonation of internal surfaces and to an increase in microporosity as a result of octahedral
OH-groups protonation and change of octahedral Al coordination. The result of the exposure to acid solutions
is a change of layer charge and interaction between the sheets and layers with each other which in turn leads
to a significant increase of the specific surface area. Also, a reduction in the cation exchange capacity occurs
due to the deposition of amorphous silica from disintegrated tetrahedral sheets on the particle surfaces as well
as a reduction of the layer charge.

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Published

2018-02-20

Issue

Vol. 15 No. 6 (2015): Sorption and chromatographic processes

Section

Статьи

How to Cite

Modification of the adsorption properties of montmorillonite by the thermochemical treatment. (2018). Sorbtsionnye I Khromatograficheskie Protsessy, 15(6), 874-883. https://doi.org/10.17308/sorpchrom.2015.15/343

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