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Title: ACID AND HEAT TREATMENT OF GEORGIAN NATURAL HEULANDITE
ACID AND HEAT TREATMENT OF GEORGIAN NATURAL HEULANDITE

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Vladimer Tsitsishvili; Bela Khutsishvili; Marinela Panayotova; Manabu Miyamoto; Nato Mirdzveli
10.5593/sgem2023V/3.2/s12.01
10.5593/sgem2023v/3.2
1314-2704
978-619-7603-64-4
English
23
3.2
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE •    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Hydrology and Water Resources
Natural zeolites, a family of hydrated aluminosilicates, are important raw materials for micro and nano technologies due to their molecular-sieve, ion-exchange and catalytic properties. Their porous crystalline framework is built from alternating SiO4 and AlO4 – tetrahedra forming cages and channels, and improvement of zeolite performance is possible by thermal and chemical treatment. The influence of hydrochloric acid and calcination on heulandite-containing tuff from the Georgian Dzegvi-Tedzami deposit was studied by the X-ray energy dispersion spectra and diffraction patterns, thermal analysis, adsorption of water, benzene and nitrogen. It was found that an acidic environment leads to significant dealumination and decationization without amorphization, but with gradual dissolution of the sample; there is also a sharp increase in the surface area and volume of micropores available for large molecules, and in the mesoporous system, pores with a diameter of 4 nm become predominant. Heat treatment leads to dehydration proceeding up to ?800 oC, amorphization starting at ?250 oC; the transition to the heulandite B at ?340 oC is not fixed, at ?500 oC wairakite is formed; at temperatures above ?1000 oC, amorphous aluminosilicate contains crystalline inclusions of cristobalite, ?-quartz, albite, hematite and magnetite. It is also shown that heat treatment increases the acid resistance of heulandite by reducing the degree of dealumination of acid-treated samples.
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This work was supported by the International Science and Technology Center (ISTC) under the project GE-2506 “Scientific substantiation of the possibility of creating new bactericidal zeolite filter materials for purification-decontamination of water from various sources”.
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https://doi.org/10.5593/sgem2023V/3.2/s12.01
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Proceedings of 23rd International Multidisciplinary Scientific GeoConference SGEM 2023
23rd International Multidisciplinary Scientific GeoConference SGEM 2023, 28-30 November, 2023
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference-SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Russian Acad Arts; Turkish Acad Sci.
3-10
28-30 November, 2023
website
9386
heulandite, dealumination, decationization, dehydration, amorphization