Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions | Sciact - CRIS-system of Boreskov Institute of Catalysis

Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions Full article

Journal

Minerals
ISSN: 2075-163X

Output data

Year: 2017, Volume: 7, Number: 4, Article number : 49, Pages count : 15 DOI: 10.3390/min7040049

Tags

Adsorption properties, Bentonite clays, Engineered barriers, Montmorillonite, Structural modification, Thermochemical treatments

Authors

Krupskaya Victoria V. ^1,2 , Zakusin Sergey V. ^1,2 , Tyupina Ekaterina A. ^3,4 , Dorzhieva Olga V. ^1,5 , Zhukhlistov Anatoliy P. ¹ , Belousov Petr E. ¹ , Timofeeva Maria N. ⁶

Affiliations

1	Belov Laboratory of Mineral Cristallochemistry, Institute of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Science, Moscow 119017, Russia
2	Department of Ecological Geology, Faculty of Geology, Lomonosov Moscow State University, Moscow 119899, Russia
3	Institute of Modern Energetics and Nanotechnology Materials-IPC, Dmitry Mendeleev University of Chemical Technology of Russia, Moscow 125480, Russia
4	National Research Nuclear University, Moscow 115409, Russia
5	Laboratory of Physical Methods Application to the Study of Rock-forming Minerals, Geological Institute, Russian Academy of Sciences, Moscow 119017, Russia
6	Research Group for Heterogeneous Catalysts for Liquid-Phase Selective Oxidations, Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russia

Funding (1)

Russian Science Foundation

16-17-10270

This paper discusses the mechanism of montmorillonite structural alteration and modification of bentonites’ properties (based on samples from clay deposits Taganskoye, Kazakhstan and Mukhortala, Buriatia) under thermochemical treatment (treatment with inorganic acid solutions at different temperatures, concentrations and reaction times). Treatment conditions were chosen according to those accepted in chemical industry for obtaining acid modified clays as catalysts or sorbents. Also, more intense treatment was carried out to simulate possible influence at the liquid radioactive site repositories. A series of methods was used: XRD, FTIR, ICP-AES, TEM, nitrogen adsorption, and particle size analysis. It allowed revealing certain processes: transformation of montmorillonite structure which appears in the leaching of interlayer and octahedral cations and protonation of the interlayer and –OH groups at octahedral sheets. In turn, changes in the structure of the 2:1 layer of montmorillonite and its interlayer result in significant alterations in the properties: reduction of cation exchange capacity and an increase of specific surface area. Acid treatment also leads to a redistribution of particle sizes and changes the pore system. The results of the work showed that bentonite clays retain a significant portion of their adsorption properties even after a prolonged and intense thermochemical treatment (1 M HNO3, 60 °C, 108 h).

Krupskaya V.V. , Zakusin S.V. , Tyupina E.A. , Dorzhieva O.V. , Zhukhlistov A.P. , Belousov P.E. , Timofeeva M.N.
Experimental Study of Montmorillonite Structure and Transformation of Its Properties under Treatment with Inorganic Acid Solutions

Minerals. 2017. V.7. N4. 49 :1-15. DOI: 10.3390/min7040049 WOS Scopus РИНЦ AN OpenAlex

Full text from publisher

Submitted:	Dec 17, 2016
Accepted:	Mar 19, 2017
Published online:	Mar 23, 2017
Published print:	Apr 1, 2017

Web of science:	WOS:000404046400003
Scopus:	2-s2.0-85016439876
Elibrary:	29495961
Chemical Abstracts:	2018:1574923
OpenAlex:	W2563294603

DB	Citing
Web of science	162
Scopus	177
Elibrary	181
OpenAlex	177