Research Information System
Clay Minerals, vol.56, no.3, pp.178-184, 2021 (SCI-Expanded)
© 2021 Cambridge University Press. All rights reserved.In this study, the adsorption of NH3 gas on a bentonite from the Ünye (Turkey), in its natural state and after acid treatments, was investigated experimentally at 298 K up to 100 kPa. Bentonite was treated with HCl solutions of various concentrations (0.5 to 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 for the characterization of the bentonite before and after acid treatment. The quantitative XRD analysis demonstrated that the B sample was composed of predominantly smectite (75 %) with substantial amount of feldspar (20 %), and minor amounts of opal CT, analcime and quartz (5 %). Increasing gas adsorption values of acid-treated bentonites were analyzed depending on their structural changes. NH3 adsorption capacities of the bentonite samples within this study (3.801-5.068 mmol.g-1) were also compared with the clay-based materials currently studied (0.828-4.0 mmol.g-1) in terms of textural and structural differences.