Role of sawdust in adsorption of Zn2+ and Cd2+ ions from aqueous system

Qasimullah Qasimullah, Anees Ahmad, Mohd Rafatullah, Othman Sulaiman, Rokiah Hashim


Sawdust, an inexpensive material, has been utilized as an adsorbent for the removal of Zn2+ and Cd2+ ions from aqueous solution. The effects of contact time, pH, concentration, and dosage of the adsorbent on the removal of Zn2+ and Cd2+ ions have been studied. The equilibrium nature of Zn2+ and Cd2+ ions adsorption at different temperatures was also studied. Two model viz.; Freundlich and Langmuir were tried to fit the observed data. Both the metal ions show a very interesting trend of adsorption where minima are seen in the adsorption isotherms. The thermodynamic parameters like free energy, entropy and enthalpy changes for the adsorption of Zn2+ and Cd2+ ions have also been computed and discussed. It is seen that the overall process of adsorption of Zn2+ ions is a multilayer endothermic process where as the Cd2+ ions shows composite adsorption behaviour.


Abia, A. A., Harsfall Jr., M., & Didi, O. (2003). The use of chemicallymodified and unmodified cassava waste for the removal of Cd, Cu and Zn ions from aqueous solution. Bioresource Technology, 90, 345–348.

Ahmad, A., Rafatullah, M., & Danish, M. (2007). Removal of Zn(II) and Cd(II) ions from aqueous solutions using treated sawdust of sissoo wood as an adsorbent. Holz als Roh- und Werkstoff, 65, 429-436.

Ahmad, A., Rafatullah, M., Sulaiman, O., Ibrahim, M. H., Chii, Y. Y., & Siddique, B. M. (2009). Removal of Cu(II) and Pb(II) ions from aqueous solutions by adsorption on sawdust of meranti wood. Desalination, 247, 636-646.

Areco, M. M., & Afonso, M. S. (2010). Copper, zinc, cadmium and lead biosorption by Gymnogongrus torulosus: Thermodynamics and kinetics studies. Colloids and Surfaces B: Biointerfaces, 81, 620-628.

Basso, M. C., Cerrella, E. G., & Cukierman, A. L. (2002). Lignocellulosic materials as potential biosorbents of trace toxic metals from wastewater. Industrial & Engineering Chemistry Research, 41, 3580-3585.

Eslamzadeh, T., Nasernejad, B., Pour, B. B., Zamani, A., & Bygi, M. E. (2004). Removal of heavy metals from aqueous solution by carrot residues. Iranian Journal of Science and Technology Transaction A, 28A1, 161–167.

Farajzadeh, M. A., & Monji, A. B. (2004). Adsorption characteristics of wheat bran towards heavy metal cations. Separation Purification Technology, 38, 197-207.

Ferro-García, M. A., Rivera-Utrilla, J., Rodríguez-Gordillo, J., & Bautista-Toledo, I. (1988). Adsorption of zinc, cadmium, and copper on activated carbons obtained from agricultural by-products. Carbon, 26, 363-370.

Freundlich, H. (1907). Ueber die adsorption in Loesungen. Zeitschrift für Physikalische Chemie, 57, 385-470.

Giles, C. H., MacEwan, T. H., Nakhwa, S. N., & Smith, D. (1960). A system of classification of solution adsorption isotherms, and its use in diagnosis of adsorption mechanisms and in measurement of specific surface area of solids. Journal of Chemical Society, 3, 3973-3993.

Hasar, H., Cuci, Y., Obek, E., & Dilekoglu, M.F. (2003). Removal of Zn(II) by activated carbon prepared from almond husk under different conditions. Adsorption Science and Technology, 21, 799-808.

Huang, C. P., & Rhoads, E.A. (1989). Adsorption of Zn (II) into hydrous aluminosilicates. Journal of Colloid Interface Science 131, 230.

Kaewsarn, P., & Yu, Q. (1999). Binary Adsorption of Copper(II) and Cadmium(II) from Aqueous Solutions by Biomass of Marine Alga Durvillaea potatorum. Separation Science and Technology, 34, 1595-1605.

Ko, D. C. K., Porter, J. F., & Mckay, G. (2003). Mass transport model for the fixed bed sorption of metal ions on bone char. Industrial & Engineering Chemistry Research, 42, 3458-3469.

Langmuir, I. (1918). The adsorption of gases on plane surfaces of glass, mica and platinum. Journal of the American Chemical Society, 40, 1361-1403.

Moser, L., & Adhaum, N. (2002). Modified activated carbon for the removal of copper, zinc, chromium and cyanide from wastewater. Separation Purification Technology, 26, 137-146.

Pegnanelli, F., Mainelli, S., Veglio, F. & Toro, L. (2003). Heavy metal removal by olive pomace: biosorbent characterisation and equilibrium modeling. Chemical Engineering Science, 58, 4709-4717.

Rafatullah, M., Sulaiman, O., Hashim, R., & Ahmad, A. (2009). Adsorption of copper (II), chromium (III), nickel (II) and lead (II) ions from aqueous solutions by meranti sawdust. Journal of Hazardous Materials, 170, 969-977.

Rafatullah, M., Sulaiman, O., Hashim, R., & Ahmad, A. (2010). Adsorption of copper (II) onto different adsorbents. Journal of Dispersion Science & Technology, 31, 918-930.

Rafatullah, M., Sulaiman, O., Hashim, R., & Ahmad, A. (2010). Removal of cadmium (II) from aqueous solutions by adsorption using meranti wood. Wood Science and technology, DOI: 10.1007/s00226-010-0374-y

Ramos, R. L., Jacome, L. A. B., Barron, J. M., Rubio, L. F., & Cornado, R. M. G. (2002). Adsorption of zinc(II) from an aqueous solution onto activated carbon. Journal of Hazardous Materials, 90, 27-38.

Sciban, M., Klasnja, M., & Skrbic, B. (2006). Modified hardwood saw dust as adsorbent of heavy metal ions from water. Wood Science & Technology, 40, 217-227.

Sun, G., & Shi, W. (1998). Sunflower stalks as adsorbents for the removal of metal ions from waste water, Industrial & Engineering Chemistry Research, 37 (4), 1324-1328.

Zhu, C., Luan, Z., Wang, Y., & Shan, X. (2007). Removal of cadmium from aqueous solutions by adsorption on granular red mud (GRM). Separation Purification Technology, 57, 161-169.

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