Acid Resistance and Ion-Exchange Capacity of Natural Mixtures of Heulandite and Chabazite
Tsitsishvili V. Panayotova M. Mirdzveli N. Dzhakipbekova N. Panayotov V. Dolaberidze N. Nijaradze M.
March 2023MDPI
Minerals
2023#13Issue 3
The recovery and immobilization of metals from wastewater often occurs in an acidic environment that destroys the structure of adsorbents such as zeolites, which are porous crystalline aluminosilicates. The influence of hydrochloric acid solutions on the structure and properties of two natural mixtures of heulandite (HEU) and chabazite (CHA)—tuff from the Georgian Dzegvi-Tedzami deposit (HEU/CHA ≈ 8) and rock from the Kazakhstani deposit Chankanay (HEU/CHA≈1)—was studied by the X-ray energy dispersion spectra and diffraction patterns, as well as by adsorption of water, benzene, and nitrogen methods. It was found that acid-mediated dealumination, decationization, dissolution, and changes in systems of micro- and mesopores depend on the nature and chemical composition of the initial zeolites. It is concluded that, under the influence of acid, (i) zeolite micropores become accessible to relatively large molecules and ions, and the surface area of the adsorbent increases; (ii) the volume of mesopores decreases, and pores with a diameter of less than 4 nm become predominant; (iii) in terms of the degree of dealumination and dissolution rate, Kazakhstani zeolite is more acid-resistant than Georgian heulandite; and (iv) Kazakhstani zeolite retains a high ion-exchange capacity in an acidic environment, while Georgian heulandite, treated with dilute hydrochloric acid solutions, uptakes relatively high amounts of valuable silver, copper, and zinc.
bactericidal metal ions exchanged zeolites , chabazite , heavy metals , heulandite-clinoptilolite , wastewater
Text of the article Перейти на текст статьи
Department of Chemistry and Chemical Technologies, Georgian National Academy of Sciences, Tbilisi, 0108, Georgia
Department of Chemistry, University of Mining and Geology “St. Ivan Rilski”, Sofia, 1700, Bulgaria
Petre Melikishvili Institute of Physical and Organic Chemistry, I. Javakhishvili Tbilisi State University, Tbilisi, 1086, Georgia
Department of Chemistry and Pharmaceutical Industry, Mukhtar Auezov South Kazakhstan University, Shymkent City, 160012, Kazakhstan
Engineering Sciences Unit, Bulgarian Academy of Sciences, Sofia, 1000, Bulgaria
Department of Chemistry and Chemical Technologies
Department of Chemistry
Petre Melikishvili Institute of Physical and Organic Chemistry
Department of Chemistry and Pharmaceutical Industry
Engineering Sciences Unit
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026