EFFECT OF THE ACID TYPE ON THE NATURAL ZEOLITE STRUCTURE

Year 2019, Volume: 2 Issue: 2, 69 - 74, 15.11.2019

Fehime Cakicioglu-ozkan , Metin Becer

Abstract

In
this study, Clinoptilolite-rich zeolitic
tuff was treated with acids such as HCl, HNO₃, H₂SO₄,
and H₃PO₄. The effect of periods of time (3 hours and 6
hours), concentration (1 M, 2 M, 3 M, 5 M, and
10 M) and acid type  were taken as
parameters. In the characterization of the zeolites, XRD, ICP-AES, FTIR, and
SEM techniques were used. As the acid concentration and the treatment time were
increased, the aluminum and cation removal from the structure was increased.

HCl
and HNO₃ were more effective acids for the dealumination than H₂SO₄ and H₃PO₄.
It was found out that considerable change in the texture of the zeolitic tuff didn’t
take place during the H₃PO₄ treatment. On the other hands,
acid treatment resulted in an increase in
the micropore surface area and volume of the zeolite. Specific surface area of
the zeolitic tuff (19 m²/g) was increased up to 213 m²/g,
236 m²/g, 202 m²/g, 118 m²/g with HCl, HNO₃,
H₂SO_4, and H₃PO₄ treatments,
respectively. In the cases of HCl and HNO₃, an increase in their
concentration furthermore than 5
M caused to the collapse of the structure.

Keywords

Acid treatment, characterization

References

• 1. Tsitsishvili G. Natural zeolites. Ellis Horwood Limited; 1992.
• 2. Breck D. Zeolite molecular sieves. New York: John Wiley & Sons; 1974.
• 3. Gola A, Rebours B, Milazzo E, Lynch J, Benazzi E, Lacombe S, et al. Effect of leaching agent in the dealumination of stabilized Y zeolites. Microporous and Mesoporous Materials. 2000 Nov;40(1–3):73–83.
• 4. Giudici R, Kouwenhoven HW, Prins R. Comparison of nitric and oxalic acid in the dealumination of mordenite. Applied Catalysis A: General. 2000 Sep;203(1):101–10.
• 5. Kawai T, Tsutsumi K. [No title found]. Adsorption. 1998;4(3/4):225–31.
• 6. Notario JS, Garcia JE, Caceres JM, Arteaga IJ, Gonzalez MM. Characterization of natural phillipsite modified with orthophosphoric acid. Applied Clay Science. 1995 Oct;10(3):209–17.
• 7. Aguilar-Armenta G, Dı́az-Jiménez L. Characterization of the porous structure of two naturally occurring materials through N2-adsorption (77 K) and gas chromatographic methods. Colloids and Surfaces A: Physicochemical and Engineering Aspects.2001 Jan;176(2–3):245–52.
• 8. Hernández MA, Rojas F, Lara VH. [No title found]. Journal of Porous Materials. 2000;7(4):443–54.
• 9. Cakicioglu-Ozkan F, Ulku S. The effect of HCl treatment on water vapor adsorption characteristics of clinoptilolite rich natural zeolite. Microporous and Mesoporous Materials. 2005 Jan;77(1):47–53.
• 10. Cakicioglu-Ozkan F, Ulku S. Adsorption Characteristics of Lead-, Barium- and Hydrogen-Rich Clinoptilolite Mineral. Adsorption Science & Technology. 2003 May;21(4):309–17.
• 11. Polatoglu I, Cakicioglu-Ozkan F. Aqueous interactions of zeolitic material in acidic and basic solutions. Microporous and Mesoporous Materials. 2010 Jul;132(1–2):219–25.
• 12. Doula MK, Ioannou A. The effect of electrolyte anion on Cu adsorption–desorption by clinoptilolite. Microporous and Mesoporous Materials. 2003 Mar;58(2):115–30.
• 13. Inglezakis VJ, Zorpas AA, Loizidou MD, Grigoropoulou HP. Simultaneous removal of metals Cu2+, Fe3+ and Cr3+ with anions SO42− and HPO42− using clinoptilolite. Microporous and Mesoporous Materials. 2003 Jul;61(1–3):167–71.
• 14. Becer M. Adsorption in volumetric system [Master of Science Thesis]. [İzmir]: İzmir Institute of Technology; 2003.
• 15. Suzuki M. Adsorption engineering. Tokyo : Amsterdam ; New York: Kodansha ; Elsevier; 1990. 295 p. (Chemical engineering monographs).