Batch studies of adsorption of copper and lead on activated carbon fromEucalyptus camaldulensis Dehn. Bark
Phussadee Patnukao , Apipreeya Kongsuwan , Prasert Pavasant
DOI:
Received September 08, 2007,Revised March 18, 2008, Accepted , Available online
Volume 20,2008,Pages 1028-1034
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Powdered activated carbon (PAC) prepared from Eucalyptus camaldulensis Dehn. bark was tested for its adsorption capacity for
Cu(II) and Pb(II). The experiment was conducted to investigate the e ects of pH, contact time, initial metal concentration, and
temperature. The best adsorption of both Cu(II) and Pb(II) occurred at pH 5, where the adsorption reached equilibrium within 45
min for the whole range of initial heavy metal concentrations (0.1–10 mmol/L). The adsorption kinetics was found to follow the
pseudo-second order model where equilibrium adsorption capacities and adsorption rate constants increased with initial heavy metal
concentrations. The adsorption isotherm followed Langmuir better than Freundlich models within the temperature range (25–60°C).
The maximum adsorption capacities (qm) occurred at 60°C, where qm for Cu(II) and Pb(II) were 0.85 and 0.89 mmol/g, respectively.
The enthalpies of Cu(II) and Pb(II) adsorption were 43.26 and 58.77 kJ/mol, respectively. The positive enthalpy of adsorption indicated
an endothermic nature of the adsorption.
