Statistical physics modeling of equilibrium adsorption of cadmium ions onto activated carbon, chitosan and chitosan/activated carbon composite

Document Type: Research Paper


Department of Chemical Engineering, Yasouj University, Yasouj 75918-74831, Iran


The adsorption ability of activated carbon, chitosan, and chitosan/activated carbon composite for cadmium separation from aqueous solution was analyzed via statistical physical modeling. The equilibrium data were analyzed by Langmuir, Hill, double layer model, and the multi-layer model with saturation isotherm models. Results showed that the multi-layer model with saturation could well describe the data. The number of the adsorbate ions per site, the receiver site density, the number of formed layers, and the energies of adsorption relative to the different layers were estimated by numerical simulation. Results showed that the chitosan/activated carbon has higher receiver site density and the total amount of adsorbed ions than that other two adsorbents. Results showed that the cadmium adsorption onto activated carbon/chitosan composite is a monolayer and exothermic process. With increasing temperature, the amount of cadmium adsorption decreases due to the fact that the number of receiver adsorption sites decreases. Also, the statistical physics modeling indicated the geometry of cadmium ions adsorbed onto the adsorbent surface is parallel.


Main Subjects

[1] Wong, K. K., Lee, C. K., Low, K. S., Haron, M. J. (2003). Removal of Cu and Pb by tartaric acid modified rice husk from aqueous solutions. Chemosphere, 50(1), 23-28.

[2] Ray, P. Z., Shipley, H. J. (2015). Inorganic nano-adsorbents for the removal of heavy metals and arsenic: a review. RSC Advances, 5(38), 29885-29907.

[3] Amirnia, S., Ray, M. B., Margaritis, A. (2015). Heavy metals removal from aqueous solutions using Saccharomyces cerevisiae in a novel continuous bioreactor–biosorption system. Chemical engineering journal, 264, 863-872.

[4] Sharaf El-Deen, S. E. A., Zhang, F. S. (2016). Immobilisation of TiO2-nanoparticles on sewage sludge and their adsorption for cadmium removal from aqueous solutions. Journal of experimental nanoscience, 11(4), 239-258.

[5] Colantonio, N., Kim, Y. (2016). Cadmium (II) removal mechanisms in microbial electrolysis cells. Journal of hazardous materials, 311, 134-141.

[6] Hydari, S., Sharififard, H., Nabavinia, M., reza Parvizi, M. (2012). A comparative investigation on removal performances of commercial activated carbon, chitosan biosorbent and chitosan/activated carbon composite for cadmium. Chemical engineering journal, 193, 276-282.

[7] World Health Organization. (2010). International travel and health: situation as on 1 January 2010. World Health Organization.

[8] Gonzalez-Munoz, M. J., Rodríguez, M. A., Luque, S., Alvarez, J. R. (2006). Recovery of heavy metals from metal industry waste waters by chemical precipitation and nanofiltration. Desalination, 200(1-3), 742-744

[9] Pehlivan, E., Altun, T. (2007). Ion-exchange of Pb2+, Cu2+, Zn2+, Cd2+, and Ni2+ ions from aqueous solution by Lewatit CNP 80. Journal of hazardous materials, 140(1-2), 299-307.

[10] Vasudevan, S., Lakshmi, J., Sozhan, G. (2011). Effects of alternating and direct current in electrocoagulation process on the removal of cadmium from water. Journal of hazardous materials, 192(1), 26-34.

[11] Zhang, S., Xu, F., Wang, Y., Zhang, W., Peng, X., Pepe, F. (2013). Silica modified calcium alginate–xanthan gum hybrid bead composites for the removal and recovery of Pb (II) from aqueous solution. Chemical engineering journal, 234, 33-42.

[12] Hebbar, R. S., Isloor, A. M., Ananda, K., Ismail, A. F. (2016). Fabrication of polydopamine functionalized halloysite nanotube/polyetherimide membranes for heavy metal removal. Journal of materials chemistry A, 4(3), 764-774.

[13] Hao, S., Zhong, Y., Pepe, F., Zhu, W. (2012). Adsorption of Pb2+ and Cu2+ on anionic surfactant-templated amino-functionalized mesoporous silicas. Chemical engineering journal, 189, 160-167.

[14] Sharififard, H., Zokaee Ashtiani, F., Soleimani, M. (2013). Adsorption of palladium and platinum from aqueous solutions by chitosan and activated carbon coated with chitosan. Asia‚ÄźPacific journal of chemical engineering, 8(3), 384-395.

[15] Sharififard, H., Soleimani, M., Ashtiani, F. Z. (2012). Evaluation of activated carbon and bio-polymer modified activated carbon performance for palladium and platinum removal. Journal of the Taiwan institute of chemical engineers, 43(5), 696-703.

[16] Mehrabi, N., Soleimani, M., Yeganeh, M. M., Sharififard, H. (2015). Parameter optimization for nitrate removal from water using activated carbon and composite of activated carbon and Fe2O3 nanoparticles. Rsc Advances, 5(64), 51470-51482.

[17] Zhang, L., Zeng, Y., Cheng, Z. (2016). Removal of heavy metal ions using chitosan and modified chitosan: A review. Journal of molecular liquids, 214, 175-191.

[18] Bansal, R. C., Goyal, M. (2005). Activated carbon adsorption. CRC press.

[19] Sellaoui, L., Guedidi, H., Knani, S., Reinert, L., Duclaux, L., Lamine, A. B. (2015). Application of statistical physics formalism to the modeling of adsorption isotherms of ibuprofen on activated carbon. Fluid Phase equilibria, 387, 103-110.

[20] Dotto, G. L., Pinto, L. A. A., Hachicha, M. A., Knani, S. (2015). New physicochemical interpretations for the adsorption of food dyes on chitosan films using statistical physics treatment. Food chemistry, 171, 1-7.

[21] Sellaoui, L., Mechi, N., Lima, É. C., Dotto, G. L., Lamine, A. B. (2017). Adsorption of diclofenac and nimesulide on activated carbon: statistical physics modeling and effect of adsorbate size. Journal of physics and chemistry of solids, 109, 117-123.

[22] Marquardt, D. W. (1963). An algorithm for least-squares estimation of nonlinear parameters. Journal of the society for industrial and applied mathematics, 11(2), 431-441.

[23] Knani, S., Aouaini, F., Bahloul, N., Khalfaoui, M., Hachicha, M. A., Lamine, A. B., Kechaou, N. (2014). Modeling of adsorption isotherms of water vapor on Tunisian olive leaves using statistical mechanical formulation. Physica a: statistical mechanics and its applications, 400, 57-70.

[24] Khalfaoui, M., Nakhli, A., Aguir, C., Omri, A., M’henni, M. F., Lamine, A. B. (2014). Statistical thermodynamics of adsorption of dye DR75 onto natural materials and its modifications: double-layer model with two adsorption energies. Environmental science and pollution research, 21(4), 3134-3144.

[25] Khalfaoui, M., Baouab, M. H. V., Gauthier, R., Lamine, A. B. (2006). Acid dye adsorption onto cationized polyamide fibres. Modeling and consequent interpretations of model parameter behaviours. Journal of colloid and interface science, 296(2), 419-427.