Abstract
Sorption studies were carried out in a batch system using Cr(III) solution on non-treated and acid-treated white-colored calcium-bentonite (WCa-B). WCa-B, which has the highest cation exchange capacity (119 meq/100 g), was treated with 2 different acids (H2SO4 and HCl) at various concentrations. The surface area was increased approximately 5 times (493 m2/g) without causing deterioration in the crystal structure of bentonite with 1.0 M H2SO4 activation. To determine the chemical and mineralogical composition of the adsorbent, which was characterized with XRD, XRF, Surface Area and Porosity, TG/DTA, FT-IR, SEM, and EDX. For Cr(III) uptake experiments, a batch method was applied. The highest Cr(III) monolayer adsorption capacity was specified as 219.8 mg/g. To Cr(III) adsorption, ΔH°, ΔS°, and ΔG° were designated onto adsorbent and it was found that adsorption is coherent with Langmuir monolayer isotherm, adsorption has an endothermic character, and has spontaneously occurred. By using pseudo-second-order and Lagergren kinetic models, Cr(III) adsorptions kinetic experiments were determined, it was designated that the adsorption was exhibited to be proper for the pseudo-second-order kinetic model.
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Data Availability
The data sets used and analyzed during the current study is available from the corresponding author on reasonable request.
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Acknowledgements
The writers are grateful for the valuable contribution to Dr Mehmet Bahadir ACAR and Dr Berkan CETINKAYA. The authors would like to thank Ceylan Mineral Madencilik San. ve Tic. A.S. for supplying and allowing the use of bentonites. The writers would like to thank Gazi University Scientific Research Projects Department for funding the 05/2015-14 coded project including this study. Also, the authors would like to thank Gazi University Academic Writing Application and Research Center (Certificate Number: 30.11.2021/0108).
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Cinar Acar, B., Yuksekdag, Z. Investigation of Chromium (III) Adsorption on Acid-Treated Bentonite Evaluation of Kinetic/Thermodynamic Data. Water Air Soil Pollut 234, 716 (2023). https://doi.org/10.1007/s11270-023-06727-5
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DOI: https://doi.org/10.1007/s11270-023-06727-5