Abstract
In this work, sorption of Pb(II), Hg(II), Cd(II), and Co(II) on sulfurized steam activated carbon (SSAC) has been studied by using a batch technique. The SSAC has been prepared from sugarcane bagasse pith by single-step steam pyrolysis in the presence of SO2 and H2S at 400 °C. The adsorption of metal ions on SSAC has been found to be time-, concentration-, pH-, and temperature-dependent. The kinetic data obtained at different temperatures have been analyzed using a pseudo-second-order equation. Kinetic and thermodynamic parameters have been determined based on the rate constants using Arrhenius and Eyring equations. The adsorption of heavy metal ions from aqueous solutions increased with increasing pH, and maximum removal [99.2% for Pb(II), 97.2% for Hg(II), 93.1% for Cd(II), and 81.9% for Co(II)] was observed in the pH range of 4.0−8.0 with an initial concentration of 100 mg/L. The selectivity order of the adsorbent is Pb(II) > Hg(II) > Cd(II) > Co(II). The H-type adsorption isotherm obtained for the ads...
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