Cu(II) adsorption from aqueous solutions on sugar beet pulp carbon

A. Ozer* and F. Tumen

Department of Chemical Engineering, University of Firat, Elazığ 23279, Turkey

Accepted 4 September 2004


Sugar beet pulp was carbonized at different temperature to convert into an effective adsorbent, namely, sugar beet pulp carbon (SBPC) to be used for the removal of Cu(II) ions from aqueous solutions. The parameters affected the adsorption yield such as pH, contact time, adsorbent dosage and initial Cu(II) concentration were optimised. The optimum pH was determined as 5.5, and it was found that the adsorption reached equilibrium state in 120min. Equilibrium data were fitted to both Langmuir and Freundlich adsorption models in the concentration range studied. The maximum adsorption capacities of Cu(II) ions were 12.24, 13.44 and 14.81mg/g for SBPCs obtained at 300, 400 and 500oC, respectively. The adsorption of Cu(II) ions were analysed using Lagergren pseudo first-order kinetic model. The results showed that the Cu(II) adsorption process followed the first order rate expression and the adsorption rate constants decreased with increasing carbonization temperature.

Keywords: Sugar beet pulp; Carbonization; Adsorption; Cu(II) ions; Isotherms

* Corresponding author
   E-mail : aozer@firat.edu.tr