INVESTIGATION OF THERMAL AND STRUCTURAL PROPERTIES OF NITRIC, HYDROCHLORIC AND SULPHURIC ACID-TREATED ZEOLITE

Year 2019, Volume: 20 , 114 - 119, 16.12.2019

Meryem Akbelen , Çağatay Ezber

https://doi.org/10.18038/estubtda.647910

Abstract

 

In this study, in order to
consider the effect of the hydrochloric acid (HCl), nitric acid (HNO₃)
and sulphuric acid (H₂SO₄) treatments on
thermal and structural properties, zeolite was modified with 1 M
acid solutions at 70 ^oC during 4 h using batch method. The
structural and thermal properties of zeolites were studied by X-ray diffraction
(XRD), X-ray fluorescence (XRF), thermogravimetric analysis (TG), differential
thermogravimetric analysis (DTG) and differential thermal analysis (DTA). Quantitative
XRD analysis show that the natural zeolite mainly consists of mordenite and
clinoptilolite with varying amounts of quartz, feldspar and clay mineral. TG-DTG
and DTA curves of all zeolite samples were obtained in the temperature range
between 30 and 1000 ^oC. Based on the TG results, the
total mass losses for all acid-treated samples (8.51-8.44 %) are less than that
of the natural (Z) sample (10.14 %).  SiO₂/
Al₂O₃ ratio of the natural zeolite sample (Z) increased
from 5.6 to 9.8, 9.7 and 8.8 in the Z-N, Z-H and Z-S samples, respectively,
indicating the removal of the significant amount of aluminum from the zeolite
structure. 

Keywords

Natural zeolite, Clinoptilolite, Mordenite, XRD, XRF, TGA-DTG-DTA

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