Sorption of uranium (VI) from aqueous solutions by DEEA organo-volcanic: Isotherms, kinetics and thermodynamic studies

doi:10.1007/s41365-018-0359-3

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (2): 30 doi: 10.1007/s41365-018-0359-3

• NUCLEAR CHEMISTRY,RADIOCHEMISTRY,RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE • Previous Articles

Sorption of uranium (VI) from aqueous solutions by DEEA organo-volcanic: Isotherms, kinetics and thermodynamic studies

Ümit H. Kaynar ¹, Ümran Hiçsönmez ², Sermin Çam Kaynar ³, Süleyman Koçak²

¹ Department of Primary School Science Teaching, Faculty of Education, Manisa Celal Bayar University, Manisa, Turkey
² Department of Chemistry, Faculty of Science and Art, Manisa Celal Bayar University, Manisa, Turkey
³ Department of Physics, Faculty of Science and Art, Manisa Celal Bayar University, Manisa, Turkey

Contact: ümran Hi?s?nmez E-mail:umran.hicsonmez@bayar.edu.tr
Supported by:
This work was supported by the Manisa Celal Bayar University (No. BAP 2012-005).

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ümit H. Kaynar, ümran Hi?s?nmez, Sermin ?am Kaynar, Süleyman Ko?ak. Sorption of uranium (VI) from aqueous solutions by DEEA organo-volcanic: Isotherms, kinetics and thermodynamic studies.Nuclear Science and Techniques, 2018, 29(2): 30 doi: 10.1007/s41365-018-0359-3

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Abstract

Abstract:

The sorption of the uranium(VI) ions from aqueous solutions by diethylethanolammonium organovolcanics (Kula-TURKEY) was investigated under different experimental conditions. DEEA was used to modify the surface of basaltic volcanics. The characteristic of basaltic volcanic was analyzed by XRF, SEM–EDS, FTIR, and XRD. The BET surface areas of unmodified volcanics and DEEA-modified volcanics were found as 2.265 and 3.689 m2/g, respectively. The volcanic samples were treated by using different concentrations of DEEA. The adsorption of U(VI) on natural and modified volcanics was examined as a function of the contact time, initial pH of the solution, initial U(VI) concentration, and temperature. Langmuir, Freundlich, and D–R adsorption isotherms were used to describe the adsorption. While examining the adsorption percentage and distribution coefficient, these values for unmodified volcanics were found to be 25% ± 0.76 and 10.08 mL/g, while the values for the DEEA-modified volcanics were 88% ± 1.04 and 220 mL/ g, respectively. The pseudo-first-order and pseudo-secondorder kinetic models were used to describe the kinetic data. In this study, it can be seen that the adsorption process is suitable for the pseudo-second-order kinetic model. Various thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were calculated with the thermodynamic distribution coefficients obtained at different temperatures. The sorption process was a chemical adsorption process. The results indicated that the processes are spontaneous and endothermic.

Key words: DEEA, Kula volcanics, Uranium, Adsorption, Isotherm

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Sorption of uranium (VI) from aqueous solutions by DEEA organo-volcanic: Isotherms, kinetics and thermodynamic studies

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