Study of Thermodynamic Parameters in Adsorption of Lead, Copper and Cadmium Metal Ions by Plant Sorbents

Document Type : Research Article


1 M.Sc. in Analytical Chemistry, Fars High Education and Research Complex, Shiraz

2 Ph.D. in Analytical Chemistry, Arak University

3 M.Sc. in Civil and Environmental Eng., Fars High Education and Research Complex, Shiraz


This research was carried out in laboratory scale using dried leaves powder of Thuja andPopulus as sorbents to remove lead, copper and cadmium ions from aqueous solution. The effect of temperature on metal ions removal by sorbents was evaluated, the equilibrium data was fitted by Langmuir, Freundlich and Dubinin-radushkevich isotherms and thermodynamic constants were determined. For this purpose, solutions with different concentration of ionic metals were prepared. Sorbent amount equal to 10 gr/lit, pH = 5 and detention time 60 minutes for all sorbents were adjusted. Studied temperatures were 20, 25, 35, 45 ºC. The results have shown that increasing the initial concentration, increases the adsorption capacity. The Langmuir model was found to best describe the data, although some adsorption processes were described with more than one model. This research indicated that the adsorption of metal ions by Populus was endothermic and adsorption of them by Thuja was exothermic processes. Determination of the thermodynamic parameters, Gibbs free energy (ΔGº) and the mean adsorption free energy (Ea) showed that the adsorption of metal ions by two plants was physical.


[1] Iqbal, M.; Edyvean, R. G. J.; “Biosorption of lead,copper and zinc ions on loofa sponge immobilized biomass of Phanerochaete chrysosporium”, J. Minerals Engineering, vol.17, pp. 217-223, 2004.
[2] Luna, A.S.; Costa, A.L.; da Costa, A. C.; Henriques, C.A.; “Competitive biosorption of cadmium(II) and
zinc(II) ions from binary systems by Sargassum filipendula”, J. Bioresour Technol., vol.101, pp. 5104-5111, 2010.
[3] El-sayed, G. O.; dessouki, H. A.; “removal of Zn(II),Cd(II) and Mn(II) from aqueous solutions by adsorption on maize stalks”, J of analytical sciences,vol. 15, pp. 8-21, 2011.
[4] Yoneda, A.; Ito, T.; Higaki, T.; Kutsuna, N.; Saito,T.; Ishimizu, T.; Osada, H.; Hasezawa, S.; Matsui,M.; Demura T.; “Cobtorin target analysis reveals that pectin functions in the deposition of cellulose microfibrils in parallel with cortical microtubules”, J. Plant, vol. 64(4), pp. 657-67, 2010.
[5] Saeed, A.; Iqbal, M. ; Waheed Akhtar, M.; “Removal and recovery of heavy metals from contaminated water using papaya wood as a new biosorbent”, ;J. Separation and Purification Technol., vol.45,pp. 25-31, 2005.
[6] Hullebusch, E. D van; Zandvoort, M. H.; Lens, P. N.; “Nickel and cobalt sorption on anaerobic granular sludges: kinetic and equilibrium studies”, J. Chemical Technology and Biotechnology, Vol. 79, pp.1219– 1227, 2004.
[7] Hameed, B. H.; Din, A. T. M.; Ahmad, A.L.; “adsorption of methylene blue onto bamboo-based activated carbon:kinetics and equilibrium studies”, J.hazardous material, vol. 141, pp. 819-825, 2007.
[8] Edwin, A. O.; Olawale, D. W.; Kennet, K. A.; Ayodeji, O. A.; “Assessment of Langmuir, freundlich and
Dubinin – Radushkevich adsorption isotherms for the biosorption of Mn(II) ions from aqueous solution by untreated corn shaft”, J. Scientific & Engineering Research, vol. 4, no. 7, 2013.
[9] Bulut, Y.; Gozubenli, N.; Aydin, H.; “Equilibrium and kinetics studies for adsorption of direct blue 71
from aqueous solution by wheat shells”, J. Hazardous Materials, vol. 144, pp. 300-306, 2007.
[10] Naiya, T. K.; Bhattacharya, A. K.; Das, S. K.;“Removal of Cd(II) from aqueous solutions using clarified sludge“, J. Colloid and Interface science,vol.325, pp. 48-56, 2008.
[11] Malik, U. R.; Nasany, S. M.; Subhani, M. S.; “Sorptive potential of sunflower stern for Cr(III) ions from
aqueous solution and its kinetic and thermodynamic profile”, J. Talanta, vol. 66, pp. 166-173, 2005.
[12] Dubinin, M. M.; Radushkevich, L. V.; “Equation of the characteristic curve of activated charcoal”, J.
Proceeding of the academy of science, 55. Physical Chemistry Section USSR, pp. 331-333, 1947.
[13] Foo, K. Y.; Hameed, B. H.; “Insights into the modeling of adsorption isotherm systems”, chemical engineering Journal, vol. 156, pp. 2-10, 2010.
[14] Ahmed, R.; Yamin, T; Ansari, M. S.; Hasany S.M.;“Sorption behaviour of lead (II) ions from aqueous
solution onto Haro river sand”, J. Adsorpt Sci.Technol., vol. 24, pp. 475-486, 2006.
[15] Tahir, S. S.; Rauf, N.; “Removal of cationic dye from aqueous solutions by adsorption onto bentonit clay”, J.
Chemosphere, vol.63, pp. 1842-1848, 2006.
[16] Jaycock, M. J.; Parfitt G. D.; "Chemistry of Interfaces”, Onichester Ellis Horwood Ltd, 1981.
[17] Ogurlu, M.; “Adsorption of a textile dye onto activated sepiolite”, J. Microporous and mesoporous
materials, vol. 119, pp. 276-283, 2009.
[18] Arzu, Y. D.; “A comparative study on determination of the equilibrium, kinetic and thermodynamic parameters of biosorption of copper (II) and lead (II)ions onto pretreated Aspergillus niger”, J. Biochemical Engineering journal, vol.28, pp.187-195, 2006.
[19] Pimentel, P. M.; Melo, M. A. F.; Melo, D. M. A.;Assuncao, A. L. C.; Henrique, D. M.; Siva, Jr C. N.;Gonzalez, G.; “Kinetics and thermodynamics of Cu (II) adsorption on oil shale wastes”, J. Fuel Processing Technology, vol. 89, pp.62-67, 2008.