Abstract
This paper discusses the sorption properties for U(VI) by alginate coated CaSO4·2H2O sepiolite and calcined diatomite earth (Kieselguhr) (ACSD). The removal of U(VI) from aqueous solution by sorption onto ACSF in a single component system with various contact times, pH, temperatures, and initial concentrations of U(VI) was investigated. The sorption patterns of uranium on the composite adsorbent followed the Langmuir, Freundlich and Dubinin-Radushkhevic (D-R) isotherms. The Freundlich, Langmuir, and D-R models have been applied and the data correlated well with Freundlich model and that the sorption was physical in nature (sorption energy, E a = 17.05 kJ/mol). The thermodynamic parameters such as variation of enthalpy ΔH, variation of entropy ΔS and variation of Gibbs free energy ΔG were calculated from the slope and intercept of lnK 0 vs. 1/T plots. Thermodynamic parameters (ΔH ads = 31.83 kJ/mol, ΔS ads = 167 J/mol·K, ΔG o ads (293.15 K) = −17.94 kJ/mol) showed the endothermic heat of sorption and the feasibility of the process. The thermodynamics of U(VI) ion/ACSD system indicates the spontaneous and endothermic nature of the process. It was noted that an increase in temperature resulted in a higher uranium loading per unit weight of the adsorbent.
Similar content being viewed by others
References
R. Qadeer, J. Hanif, M. Saleem, M. Afzal, J. Radioanal. Nucl. Chem., 165 (1992) 243.
R. Qadeer, J. Hanif, M. Khan, M. Saleem, Radiochim. Acta, 68 (1995) 197.
R. Qadeer, J. Hanif, Radiochim. Acta, 65 (1994) 259.
A. Mellah, A. Silem, A. Boualia, R. Kada, Chem. Eng. Process, 31(3) (1992) 191.
M. Saleem, M. Afzal, R. Qadeer, J. Hanif, Separ. Sci. Technol., 27 (1992) 239.
K. Brauner, A. Preisinger, Tschermaks Miner. Petrogr. Mitt., 6 (1956) 120.
A. Alvarez, Sepiolite: properties and uses, in: Developments in Sedimentology, A. Singer and E. Galan (Eds), Elsevier, Amsterdam, 1984, p. 253.
E. Galan, Clay Miner., 31 (1996) 443.
F. A. Abu Al-Rub, M. Kandah, N. Al-Dabaybeh, Separ. Sci. Technol., 38 (2003) 463.
A. Saeed, M. Iqbal, M. W. Akhtar, J. Hazard. Mater., 117 (2005) 65.
R. Gong, Y. D. Ding, H. Liu, Q. Chen, Z. Liu, Chemosphere, 58 (2005) 125.
F. A. Abu Al-Rub, M. H. El-Naas, F. Benyahia, I. Ashour, Process Biochem., 39 (2004) 1767.
T. Davis, B. Volesky, A. Mucci, Water Res., 37 (2003) 4311.
D. Schmitt, A. Muller, Z. Csoger, F. H. Frimmel, C. Posten, Water Res., 35 (2001) 779.
Z. R. Holan, B. Volesky, Appl. Biochem. Biotechnol., 53 (1995) 133.
J. P. K. Wong, Y. S. Wong, N. F. Y. Tam, Bioresour. Technol., 73 (2000) 133.
C. J. Daughney, J. B. Fein, Y. Nathan, Chem. Geol., 144 (1998) 161.
M. A. Hashim, K. H. Chu, Modelling the batch adsorption of copper by the microalga Chlorella vulgaris, in: Proc. of the 6th World Congress of Chemical Engineering, Melbourne, Australia, September, 2001, p. 23.
Analysis Reports of Diatomite, Turkish Sugar Fact. Inc., Kieselguhr Factory, Etimesgut- Ankara/Turkey, 1986.
C. A. Francais, Anal. Chem., 30 (1958) 50.
T. M. Florence, AAEC/TM552, 1970, Paper 5.
A. Singer, Palygorskite and sepiolite group minerals, in: Minerals in Soil Environment, J. B. Dixon, S. B. Weed (Eds), Soil Science Society of America, Madison, WI, USA, 1989, p. 829.
D. Read, T. A. Lawless, R. J. Sims, K. R. Butter, J. Contam. Hydrol., 13 (1993) 277.
E. Taskaev, D. Apostolov, J. Radioanal. Chem., 45 (1978) 65.
J. Paquette, R. J. Lemire, Nucl. Sci. Eng., 79 (1981) 26.
W. A. Abbasi, M. Streat, Separ. Sci. Technol., 29 (1994) 1217.
T. J. Sorg, Removal of uranium from drinking water by conventional treatment methods, in: Radon, Radium and Uranium in Drinking Water, Vol. 2, Cothern and Rebers (Eds), Lewis Publishers, Michigan, ISBN 0 87371, 1991, p. 173.
C. Hennig, T. Reich, R. Dahn, A. M. Scheidegger, Radiochim. Acta, 90 (2002) 653.
E. R. Sylwester, E. A. Hudson, P. G. Allen, Geochim. Cosmochim. Acta, 64 (2000) 2431.
I. Langmuir, J. Am. Chem. Soc., 40 (1918) 1361.
A. Boualia, A. Mellah, T. T. Aissaoui, K. Menacer, A. Silem, Appl. Clay Sci., 7 (1993) 431.
S. Chegrouche, A. Mellah, S. Telmoune, Water Res., 31 (1997) 1733.
A. Mellah, S. Chegrouche, Water Res., 31 (1997) 621.
S. M. Hasany, M. M. Saeed, M. Ahmed, J. Radioanal. Nucl. Chem., 252 (2002) 477.
S. Aksoyoglu, J. Radioanal. Nucl. Chem., 134 (1989) 393.
C. J. Daughney, J. B. Fein, Y. Nathan, Chem. Geol., 144 (1998) 161.
G. C. Catena, F. V. Bright, Anal. Chem., 61 (1989) 905.
Fraiji, D. M. Hayes, T. C. Werner, J. Chem. Educ., 69 (1992) 424.
M. M. Saeed, J. Radioanal. Nucl. Chem., 256(1) (2003) 73.
R. Donat, Ş. Aytaş, J. Radioanal. Nucl. Chem., 265 (2005) 107.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Donat, R., Cılgı, G.K., Aytas, S. et al. Thermodynamic parameters and sorption of U(VI) on ACSD. J Radioanal Nucl Chem 279, 271–280 (2009). https://doi.org/10.1007/s10967-007-7239-3
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10967-007-7239-3