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

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