Acid Modification of Georgian Natural Heulandite

• Autorzy: Tsitsishvili, Vladimer , Ebralidze, Ketevan , Dolaberidze, Nanuli , Mirdzveli, Nato , Nijaradze, Manana , Amiridze, Zurab , Khutsishvili, Bela

Warianty tytułu

PL

Kwaśna modyfikacja gruzińskiego heulandytu naturalnego

• Języki publikacji: EN

Abstrakty

EN

Acid treatment is a powerful tool for improving the performance of natural zeolites, and the purpose of our work was to study chemical composition, structure and properties of acid-treated heulandite from the Tedzami-Dzegvi deposit. Samples of heulandite-containing tuff from the Rkoni plot with zeolite phase content up to 90%, consisting of heulandite and chabazite in a ratio of 8:1, and having chemical composition described by empirical formula |Na0.25K0.06Ca0.19Mg0.15)|[AlSi3.6O9.2] .3H2O were treated with hydrochloric acid solutions with concentration up to 2.0 N. It was established that acid treatment leads to significant dealumination (the molar ratio of Si/Al increases from 3.6 to 9.5) and decationization (the total charge per aluminium atom decreases from 1 to 0.68), sodium and magnesium are mainly leached, calcium and potassium does not take part in the decationization process. Powder X-ray diffraction patterns show that hydrochloric acid solutions with a concentration up to 2.0 N do not lead to amorphization of the zeolite microporous crystal structure, but can gradually dissolve it. The adsorption of water vapor indicates the availability of micropores for the entry of small polar molecules, benzene adsorption shows a slight increase of hydrophobicity of the surface as a result of acid treatment. Nitrogen adsorption-desorption isotherms show acid-mediated sharp increase of adsorption in micropores and of the surface area, as well as changes in the mesoporous system, leading to the prevalence of pores with a diameter of 3 – 10 nm. The concentration of dilute solutions of hydrochloric acid is determined, which provides availability of micropores for large ions and nonpolar molecules, but at which dealumination is insignificant and ion-exchange capacity remains at a sufficient level. Materials obtained by acid treatment of heulandite can be used as adsorbents, ion exchangers, and carriers of biologically active substances and metal ions.

Słowa kluczowe

PL

kwasowanie; skład chemiczny; zeolity; materiały filtracyjne

EN

acid treatment; chemical composition; zeolites; filter materials

• Czasopismo: Inżynieria Mineralna
• Rocznik: 2024
• Tom: Vol. 1, no. 1
• Strony: 483--491
• Opis fizyczny: Bibliogr. 43 poz.,2, tab.,wykr.

Twórcy

autor

Tsitsishvili, Vladimer

• Georgian National Academy of Sciences, 52, Rustaveli Ave., 0108, Tbilisi, Georgia,
• Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia

autor

Ebralidze, Ketevan

• Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia,

autor

Dolaberidze, Nanuli

• Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia,

autor

Mirdzveli, Nato

• Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia,

autor

Nijaradze, Manana

• Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia,

autor

Amiridze, Zurab

• Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia,

autor

Khutsishvili, Bela

• Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia,

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki i promocja sportu (2025).

Identyfikatory

DOI

10.29227/IM-2024-01-54