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Influence of acid activation on the NH3-adsorption properties of a Turkish bentonite

Published online by Cambridge University Press:  24 November 2021

Burcu Erdoğan*
Affiliation:
Eskisehir Technical University, Faculty of Science, Department of Physics, Yunusemre Campus, 26470 Tepebasi, Eskisehir, Turkey
Orkun Ergürhan
Affiliation:
Eskisehir Technical University, Faculty of Science, Department of Physics, Yunusemre Campus, 26470 Tepebasi, Eskisehir, Turkey
Aslıhan Anter
Affiliation:
Gazi University, Faculty of Science, Department of Physics, Ankara, Turkey

Abstract

In this study, the adsorption of NH3 gas on a bentonite from Ünye (Turkey) in its natural state and after acid treatments, was investigated experimentally at 298 K and up to 100 kPa. Bentonite was treated with HCl solutions of various concentrations (0.5–2.5 M) at 75°C for 4 h. X-ray diffraction (XRD), X-ray fluorescence (XRF), N2 adsorption and thermogravimetric/differential thermal analysis (TG/DTA) were used to characterize the bentonite before and after acid treatment. The quantitative XRD analysis demonstrated that the bentonite sample was composed predominantly of smectite (75%), with abundant feldspar (20%) and minor opal-CT, analcime and quartz (5%). Increasing gas adsorption values of acid-treated bentonites were analysed depending on the structural changes of the clay. The NH3-adsorption capacities of the bentonite samples (3.801–5.068 mmol g–1) were also compared with previously studied clay-based materials (0.828–4.000 mmol g–1) in terms of their textural and structural differences.

Type
Article
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Stephan Kaufhold

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