Adsorption of Copper (II) from Aqueous Solution by Using Carbonized Peanut Hull: Determination of the Equilibrium, Kinetic and Thermodynamic Parameters
Abstract
In this study, the effect of temperature, pH, initial metal concentration and adsorbent dosage on Cu(II) adsorption onto carbonized peanut hull (PHC) was investigated. Activated carbon was prepared from peanut hull. It was produced by carbonization in carbon diokside atmosphere at 500 °C for 1.0 h. The maximum Cu (II) adsorption capacity was obtained as 168.16 mg/g for 500 mg/L initial Cu (II) at pH = 4.0 and 60 °C. The Freundlich and Langmuir adsorption models were used for the mathematical description of the adsorption equilibrium. The best interpretation for the experimental data was given by the Freundlich isotherm and the maximum adsorption capacity was obtained. Batch adsorption models, based on the assumption of the pseudo-first and pseudo-second order mechanism, were applied to examine the kinetics of the adsorption. Kinetic data fitted the pseudo-second kinetic order model. Thermodynamic functions, the change of free energy (Go), enthalpy (Ho) and entropy (So) of copper adsorption on PHC were calculated as -23.21 kjmol-1 (at 60 oC), 15.94 kjmol-1 and 117.59 kjmol-1 K-1, respectively, indicating the spontaneous, endothermic and the increased randomness nature of Cu2+ adsorption. The results show that adsorption of Cu (II) on PHC is an.
Keywords
Adsorption,Carbonization,Peanut hull carbon (PHC),Equilibrium,Kinetic
Kaynakça
- Argun, M. E., Dursun, S. (2008). A new approach to modification of natural adsorbent for heavy metal adsorption. Bioresearch Technology, 99, 2516–2527.
- Bansode, R.R., Losso, J.N., Marshall, W.E., Rao, R.M., Portier, R.J. (2004). Pecan shell-based granular activated carbon for treatment of chemical oxygen demand (COD) in municipal wastewater. Bioresour. Technol. 94, 129–135.
- Bayat, B. (2002). Comparative study of adsorption properties of Turkish fly ashes. I. The case of nickel(II), copper(II) and zinc(II). J. Hazard. Mater. 3897, 1–23.
- Cetin, S., Pehlivan, E. (2007). The use of fly ash as a low cost, environmentally friendly alternative to activated carbon for the removal of heavy metals from aqueous solutions. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 298(1-2), 83-87.
- Demirbaş, E., Dizge, N., Kobya, M. (2009). Adsorption kinetics and equilibrium of copper from aqueous solutions using hazelnut shell activated carbon. Chemical Eng. J, 148, 480-487.
- Dursun, A. Y. (2006). A comparative study on determination of the equilibrium, kinetic and Thermodynamic parameters of adsorption of copper (II) and lead (II) ions onto pretreated Aspergillus niger. Biochem. Eng. J, 28, 187–195.
- Dursun, G., Çiçek, H., Dursun, A.Y. (2005). Adsorption of phenol from aqueous solution by using carbonised beet pulp. Journal of Hazardous Materials, 125 (1-3, 17), 175- 182.
- El-Ashtoukhy, E.-S Z., Amin, N.K., Abdelwahab, O. (2008). Removal of lead (II) and copper (II) from aqueous solution using pomegranate peel as a new adsorbent. Desalination, 223, (1-3): 162-173.
- Freundlich, H.M.F. (1906). Uberdie adsorption in lasungen. J. Phys. Chem.; 57, 385-470.
- Giwa, O.S., Bello, I.A. (2007). Removal of heavy metal from industrial wastewater using modified activated coconut shell carbon. Biochem. Engin. J., 36(2), 174-181.